JAVA GUI PROGRAMMING REVISION TOUR 1 SOLUTIONS CLASS XII

What is Java?

Java is a popular programming language, created in 1995.

It is owned by Oracle, and more than 3 billion devices run Java.

It is used for:

• Mobile applications (specially Android apps)
• Desktop applications
• Web applications
• Web servers and application servers
• Games
• Database connection
• And much, much more!

1.What is RAD?

Ans: Rapid Application Development (RAD) describes a method of developing software through the use of pre-programming tools or wizards. The pre-programmed tools or controls are simply dropped on a screen to visually design the interface of application.

2 What are RAD tools?

Ans: RAD tools are the tool that enables one to create applications in shorter time as compared to conventional language.

3 What is event? What is message? How is it related to an event?

Ans:  An event refers to the occurrence of an activity.

 A message is the information/request sent to the application.

 Each time an event occurs, it causes a message to be sent to the operating system.

4 What are properties? What is property window?

Ans:  Properties are the attributes of graphical controls.

 Properties window displays the editable settings for the currently selected component.

5 What are containers? Give examples.

Ans: A container is a control that can hold other controls within it. For example, JPanel, JFrame, JApplet and JDialog are

container classes.

6 What are child controls?

Ans: The container control is the one that can contain/hold other controls in it. The contained controls are known as child

controls.

7 What happens to container control and its child controls if you delete

(i) The container control,

(ii) A child control

(iii) All child controls?

Ans: (i) If container control is deleted then with container control child control will be also deleted

(ii) If a child control is deleted then the container control will be remain and a child control will be deleted.

(iii) If all child controls is deleted then the container control will be remain and all the child control will be

deleted.

8 Name the character set supported by java.

Ans: Java uses the Unicode character set.

9 What are keywords? Can keywords be used as identifiers?

Ans:  Keywords are the words that convey a special meaning to the language compiler. These are reserved for special purpose.

 Keywords cannot be used as identifiers.

10 What is an identifier? What is the identifier forming rule of java?

Ans:  Identifiers are user define names for different parts of program.

 Identifier forming rules of java state the following:

1. Identifiers can have alphabets, digits, and underscore and dollar sign characters.

2. They must not be a keyword or Boolean literal or null literal.

3. They must not begin with a digit.

4. They can be of any length.

5. Java is case sensitive i.e., upper-case letters and lower case letters are treated differently.

11 Is java case sensitive? What is meant by the term ‘case sensitive’?

Ans:  Java is case sensitive.

 Case sensitive meant upper-case letters and lower case letters are treated differently.

12 Which of the following are valid identifiers and why/why not?

Data_rec, _data, 1 data, data 1, my.file, asm, switch, goto, break

Ans: 1. Data_rec: Valid identifiers

2. _data: Valid identifiers

3. 1 data: Not valid because they must not begin with a digit

4. data 1: not valid because space is not allowed.

5. my.file: not valid because special character not allowed.

6. Asm: Valid identifiers

7. Switch: not valid because reserved keyword is not allowed.

8. goto: not valid because reserved keyword is not allowed.

9. break: not valid because reserved keyword is not allowed.

13 What are literals? How many types of integer literals are available in java?

Ans:  Literals are data items that never change their value during a program run.

 integer-literal (decimal, octal, hexadecimal)

14 How many types of integer constant are allowed in java: How are they written?

Ans: There are three types of integer constant are allowed in java.

1. Decimal: 17

2. Octal: 011

3. Hexadecimal: 0XBC1

15 What kind of constant are the following: 14, 011, 0X2A, 17, 014, 0XBC1?

Ans: 1. Decimal: 14, 17

2. Octal: 011, 014

3. Hexadecimal: 0XBC1, 0X2A

16 Write the following real constants into exponent form: 23.197, 7.214, 0.00005, and 0.319.

Ans: 1. 23.197 -> 2.3197 × 102 =2.3197E02

2. 7.214 -> 0.7214 x 101 = 0.7214E01

3. 0.00005 -> 0.000005 x 101 =0.000005E01

4. 0.319 -> 0.0319 x 101 = 0.0319E01

17 What will be the result of a=5/3 if a is

(i) float (ii) int?

Ans: (i) float-> 1.0

(ii) int->1

18 The expression 8%3 evaluates to _____________.

Ans: 2

19 What will be the value of j=--k+2*k+l++ if k is 20 initially?

Ans: 57

20 What will be the value of p=p*++j where j is 22 and p=3 initially?

Ans: 69

21 Write equivalent java expression for the following expressions:

(i) ut +

11

22 ft2

(ii) |a|+b>=|b|+a

(iii) �

3333+5555

5555+3333 − 888888

222222�

(iv) ee�22xx22−4444�

Ans: (i) x=u*t+(1/2)*f*t*t;

(ii) a+b>=b+a;

(iii) x=((3*x+5*y)/(5*x+3*y)-(8*x*y)/(2*y*x))

(iv) Math.pow(e,(2*x*x-4*x))

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22 What is meant by implicit and explicit type conversion?

Ans:  An implicit type conversion is a conversion performed by the compiler without programmer’s intervention.

 An explicit type conversion is user-defined that forces an expression to be of specific type.

23 What do you mean by type casting? What is type cast operator?

Ans:  The explicit conversion of an operand to a specific type is called Type Casting.

 Type cast operator is used for Casts or converts a value to the specified type.

24 What will be the resultant type of the following expressions if bh represents a byte variable, i is an int variable, fl is a

float variable and db is a double variable?

(i) Bh-i+db/fl-i*fl+db/i.

(ii) (int) (fl+db)

Ans: (i) Double

(ii) Double

25 What is the significance of null statement?

Ans: A null statement is useful in those instances where the syntax of the language requires the presence of a statement

but where the logic of the program does not.

26 What are three constructs that govern statement flow?

Ans: Sequence

Selection

Iteration

27 One out of several different alternatives can be selected with the help of which statement?

Ans: Switch statement

28 What is significance of a break statement in a switch statement?

Ans: The break statements are necessary because without them, statements in switch blocks fall through: All statements after the matching case label are executed in sequence, regardless of the expression of subsequent case labels, until a

break statement is encountered.

29 Write one limitation and one advantage of switch statement.

Ans: Advantage:

 The switch statement is a control statement that handles multiple selections and enumerations by passing

control to one of the case statements within its body.

Limitation:

 Logical operators cannot be used with switch statement.

case k>=20;

 Switch case variables can have only int and char data type.

30 What is the effect of absence of break in a switch statement?

Ans: without the break statement, statements in switch blocks fall through

31 What is the significance of default clause in a switch statement?

Ans: Default clause is used for the else situation in a switch statement

32 What are iteration statements? Name the iteration statements provide by java.

Ans: The iteration statements allow a set of instructions to be performed repeatedly until a certain condition is fulfilled.

Java provides three kind of looping statements: for loop, while loop, do-while loop.

33 Which elements are needed to control a loop?

Ans: 1. Initialization Expression(s).

2. Test Expression.

3. Update Expression(s).

4. The Body-of-the-Loop.

34 What is meant by an entry-controlled loop? Which java loops are entry-controlled?

Ans:  Entry-controlled loops: Here loop condition is tested before entering in to the loop.

 for and while loops are entry-controlled loop

35 What is meant by an exit-controlled loop? Which java loops are exit-controlled?

Ans:  Exit-controlled loops: Here loop body is executed first and then continuation condition is evaluated.

 Do-while loop is exit-controlled loop.

36 Write for loop that displays the numbers from 51 to 60.

Ans: for(int i=51;i<60;i++)

37 Write for loop that displays the numbers from 10 to 1 i.e., 10, 9, 8........ 3, 2, 1

Ans: for(i=10;i>=1;i--)

Type B: Short/Long Answer Questions

1 How are event, message, methods and properties interrelated?

Ans: Event, message, methods and properties all are used for accomplishing the Event handling system for GUI application.

All 4 of them are interrelated with each other by this way –

Event is occurrence of something happened, when event occurred message is sent to application based on which

method takes an action which and depending on the method’s action properties are sets or gets.

2 Name at least three common controls. Also give some of their properties.

Ans 1. Label

Properties: background, border, font, foreground, icon, text

2. TextField

Properties: background, border, font, foreground, editable, focusable, text

3. Password Field

Properties: background, font, foreground, text, echoChar

3 How are keywords different from identifiers?

Ans:

Keywords Identifiers

 Keywords are reserved words used for

special purpose and must not be used as

normal identifier names.

 Example : do, if, catch, final

 Identifiers are fumdamental building blocks of a program

and are used as the general terminology for the names

given to different parts of the program.

 Example: Myfile, _ds, date_7_9

4 What are literals in java? How many types of literals are allowed in java?

Ans:  Literals are also referred to as constants. They never change their value during program run.

 There are several kinds of literals available in Java. These are:

integer-literals, character-literals, floating literals, boolean literals, string literals, the null literals.

5 Determine the data type of the expression

(i) �

111111(11−pppp)

(qq+rr) � − � (pp+rr)/ss

(llllllll)(ss+pp)

�

(ii) �

2222+3333

5555+6666 + 8888

5555�4

If p, x is an int, r, w is a float, q, y is a long and s, z is double, t is short and u is long double.

Ans: (i) double

(ii) double

6 Given the following code fragment:

if (a == 0)

System.out.println (“Zero”);

if (a == 1)

System.out.println (“One”);

if (a == 2)

System.out.println (“Two”);

if (a == 3)

System.out.println (“Three”);

Write an alternative code (using if) that saves on number of comparisons.

Ans: if(a==0)

{

System.out.println(“Zero”);

}

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else if(a==1)

{

System.out.println(“One”);

}

else if(a==2)

{

System.out.println(“Two”);

}

else if (a == 3)

{

System.out.println(“Three”);

}

7 Rewrite the following fragment using switch:

if (ch == ‘E’)

eastern++;

if (ch == ‘W’)

western++;

if (ch == ‘N’)

northern++;

if (ch == ‘S’)

southern++;

else

unknown++;

Ans: switch(ch)

{

case‘E’: eastern++;

break;

case‘W’: western++;

break;

case‘N’: northern++;

break;

case‘S’: southern++;

break;

default:

unknown++;

}

8 How many times are the following loops executed?

(a) X=5; Y=50;

while(X <= Y)

{

X = Y/X;

...........

}

(b) int m=10,n=7;

while (m % n >=0)

{

. .. . . .. . . . . . ..

m =m + 1;

n = n + 2;

...............

}

Ans: (a) Infinite loop

(b) Infinite loop

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9 Given the following code fragment:

i = 2;

do {

System.out.println (i);

i += 2;

} while (i < 51);

JOptionPane.showMessageDialog (null, “Thank you”);

Rewrite the above code using a while loop.

Ans: i = 2;

while (i < 51);

{

i += 2;

System.out.println(i);

}

JOptionPane.showMessageDialog (null, “Thank you”);

10 Given the following code fragment:

i = 100;

while (i > 0)

System.out.println (i--)

JOptionPane.showMessageDialog (null, “Thank you”);

Rewrite the above code using a do while loop.

Ans: i = 100;

do{

System.out.println (i);

i--;

}while (i > 0)

JOptionPane.showMessageDialog (null, “Thank you”);

11 Rewrite following while loop into a for loop

int stripes = 0;

while (stripes <= 13) {

if (stripes % 2 == 2)

{

System.out.println(“colour code Red”);

}

else {

System.out.println(“colour code Blue”);

}

System.out.println(“New stripe”);

stripes = stripes + 1;

}

Ans: int stripes = 0;

for(stripes=0; stripes <= 13; stripes++)

{

if (stripes % 2 == 2)

{

System.out.println(“colour code Red”);

}

else

{

System.out.println(“colour code Blue”);

}

System.out.println(“New stripe”);

}

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Output and Error Questions

12 Find the output of the following code fragments?

(a) int s = 14;

if (s < 20)

System.out.print("under");

else

System.out.print("Over");

System.out.println("the limit.")

(b) int s = 14;

if(s < 20)

System.outprint("under");

else {

System.out.print("over");

System.out.println("the limit");

}

(c) int s = 94;

if(s < 20){

System.outprint("under");

}

else {

System.out.print("over");

}

System.out.println("the limit");

Ans: (a) Compilation Error

Correct Code

int s = 14;

if (s < 20)

System.out.print("under");

else

System.out.print("Over");

System.out.println("the limit.");

Correct Output-> underthe limit

(b) Compilation Error

Correct Code

int s = 14;

if(s < 20)

System.out.print("under");

else {

System.out.print("over");

System.out.println("the limit");

}

Correct Output-> underthe limit

(c) Output -> Overthe limit

13 What will be the output of following code fragment when the value of ch is

(a) ‘A’ (b) ‘C’ (c) ‘D’ (d) ‘F’?

switch(ch) {

case 'A' : System.out.println("Grade A");

case 'B' : System.out.println("Grade B");

case 'C' : System.out.println("Grade C");

break;

case 'D' : System.out.println("Grade D");

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default : System.out.println "Grade F";

}

Ans: (a) When input is A, the output will be as follows:

Grade A

Grade B

Grade C

(b) When input is C, the output will be as follows:

Grade C

(c) When input is D, the output will be as follows:

Grade D

(d) When input is F, the output will be as follows:

Grade F

14 Predict the output of the following code fragment:

int n=0; int j=7; int i=3;

if(i>2) {

n=1;

if(j>4)

n=2;

else

n=3;

}

else {

n=4;

if(j%2 >= 2)

n=5;

else

n=6;

}

JOptionPane.showMessageDialog(null,n);

Ans:

15 Predict the output of the following code fragments:

(a) int i,j,n;

n=0; i=1;

do {

n++; i++;

} while(i<=5);

(b) int i=1,j=0,n=0;

while(i<4) {

for(j=1;j<=i;j++) {

n+=1;

}

i=i+1;

}

System.out.println(n);

(c) int i=3,n=0;

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while (i<4) {

n++; i--;

}

System.out.println(n);

(d) int j=1,s=0;

while(j<10) {

System.out.println(j+ "+");

s=s+j;

j=j+j%3;

}

System.out.println("=" +s);

Ans: (a) If System.out.print() is inside while loop output is 12345 and if outside of while loop output is 5

(b) 6

(c) -2147483644

(d) 2+

4+

5+

7+

8+

=27

16 Find out errors, if any:

(a) m=1;

n=0;

for(;m+n<19;++n)

System.out.println("Hello \n");

m=m+10;

(b) while(ctr !=10); {

ctr=1;

sum=sum+a;

ctr=ctr+1;

}

(c) for(a=1, a>10;a=a+1)

{ .......

}

Ans: (a) int m,n;

m=1;

n=0;

for(;m+n<19;++n)

System.out.println("Hello \n");

m=m+10;

(b) while(ctr !=10) {

ctr=1;

sum=sum+a;

ctr=ctr+1;

}

(c) for(a=1; a>10;a=a+1)

{ .......

}

17 Identify the possible error(s) in the following code fragment: Discuss the reason(s) of error(s) and correct the code.

:

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f=1;

for(int a=40; (a); a--)

f*=a;

:

s=0;

for(int a=1;a<40/a++)

s+=a;

Ans: :

f=1;

for(int a=40;a>1;a--)

f*=a;

:

s=0;

for(int a=1;a<40;a++)

s+=a;

Type C: Practical/Lab Questions

1 Design an application that performs arithmetic operations (+, -, *, and /). The sample screenshot is being show

below.

Ans: // Addition

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {

int num1=Integer.parseInt(jTextField1.getText());

int num2=Integer.parseInt(jTextField2.getText());

jTextField3.setText(Integer.toString(Integer.parseInt(jTextField1.getText())+Int

eger.parseInt(jTextField2.getText())));

}

// Substraction

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {

int num1=Integer.parseInt(jTextField1.getText());

int num2=Integer.parseInt(jTextField2.getText());

jTextField3.setText(Integer.toString(Integer.parseInt(jTextField1.getText())-

Integer.parseInt(jTextField2.getText())));

}

// Multiply

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {

int num1=Integer.parseInt(jTextField1.getText());

int num2=Integer.parseInt(jTextField2.getText());

jTextField3.setText(Integer.toString(Integer.parseInt(jTextField1.getText())*Int

eger.parseInt(jTextField2.getText())));

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}

// Division

private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {

int num1=Integer.parseInt(jTextField1.getText());

int num2=Integer.parseInt(jTextField2.getText());

jTextField3.setText(Integer.toString(Integer.parseInt(jTextField1.getText())/Int

eger.parseInt(jTextField2.getText())));

}

//Clear

jTextField1.setText(null);

jTextField2.setText(null);

jTextField3.setText(null);

2 Practice – if statements. Design a GUI application having interface as shown below:

 In the left half of above interface, two numbers are to be accepted. When the user clicks at button “Which

number is larger ?”, appropriate message gets displayed in the left label.

 In the right half of above interface, a number grade is input. Valid grades are 0-4. Upon clicking the right

push button, a message depicting validity of grade is displayed in right label.

Ans: //larger number

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {

// TODO add your handling code here:

int num1=Integer.parseInt(jTextField1.getText());

int num2=Integer.parseInt(jTextField2.getText());

if(num1>num2)

{

jLabel4.setText("The first number is larger than the second");

}

else

{

jLabel4.setText("The second number is larger than the first");

}

}

// valid number

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {

// TODO add your handling code here:

float num1=Float.parseFloat(jTextField3.getText());

if(num1>=0.0 && num1<=4.0)

{

jLabel8.setText("This is a valid Grade");

}

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else

{

jLabel8.setText("This is NOT a valid Grade");

}

}

3 Practice –Loops. Design a GUI application having interface as shown below:

 The loop for the frame should print numbers from lowest to highest on the basis of given two numbers,

upon clicking at “Count” button.

Ans: // loop count

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {

int num1=Integer.parseInt(jTextField1.getText());

int num2=Integer.parseInt(jTextField2.getText());

String msg="";

if(num1<num2)

{

jLabel1.setText(Integer.toString(num1));

for(int i=num1;i<=num2;i++)

{

msg+=Integer.toString(i)+" ";

}

jLabel1.setText(msg);

}

else

{

jLabel1.setText(Integer.toString(num2));

for(int i=num2;i<=num1;i++)

{

msg+=Integer.toString(i)+" ";

}

jLabel1.setText(msg);

}

}

4 Practice –Select case. Design a GUI application having interface as shown below:

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The percentage marks are to be entered in the text box and upon clicking at the button, corresponding grade (as per

following rules) should be displayed in the picture box below command button.

Ans private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {

// TODO add your handling code here:

int num=Integer.parseInt(jTextField1.getText());

switch(num/10)

{

case 10:

jLabel1.setText("You get an A++");

break;

case 9:

jLabel1.setText("You get an A++");

break;

case 8:

jLabel1.setText("You get an A+");

break;

case 7:

jLabel1.setText("You get an A");

break;

case 6:

jLabel1.setText("You get a B");

break;

case 5:

jLabel1.setText("You get a C");

break;

case 4:

jLabel1.setText("You get a D");

break;

default:

jLabel1.setText("Fail");

}

}

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Why Use Java?

• Java works on different platforms (Windows, Mac, Linux, Raspberry Pi, etc.)
• It is one of the most popular programming language in the world
• It is easy to learn and simple to use
• It is open-source and free
• It is secure, fast and powerful
• It has a huge community support (tens of millions of developers)

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Java Exercises

Java is the foundation for virtually every type of networked application and is the global standard for developing and delivering embedded and mobile applications, games, Web-based content, and enterprise software. With more than 9 million developers worldwide, Java enables you to efficiently develop, deploy and use exciting applications and services.

The best way we learn anything is by practice and exercise questions. Here you have the opportunity to practice the Java programming language concepts by solving the exercises starting from basic to more complex exercises. A sample solution is provided for each exercise. It is recommended to do these exercises by yourself first before checking the solution.

Hope, these exercises help you to improve your Java programming coding skills. Currently, following sections are available, we are working hard to add more exercises .... Happy Coding!

Java GUI Programming
Revision Tour-I
Type A: Very Short/Short Answer Questions
1 What is RAD?
Ans: Rapid Application Development (RAD) describes a method of developing software through the use of pre-
programming tools or wizards. The pre-programmed tools or controls are simply dropped on a screen to visually 
design the interface of application. 
2 What are RAD tools?
Ans: RAD tools are the tool that enables one to create applications in shorter time as compared to conventional language.
3 What is event? What is message? How is it related to an event?
Ans:  An event refers to the occurrence of an activity.
 A message is the information/request sent to the application.
 Each time an event occurs, it causes a message to be sent to the operating system.
4 What are properties? What is property window?
Ans:  Properties are the attributes of graphical controls.
 Properties window displays the editable settings for the currently selected component.
5 What are containers? Give examples.
Ans: A container is a control that can hold other controls within it. For example, JPanel, JFrame, JApplet and JDialog are 
container classes.
6 What are child controls?
Ans: The container control is the one that can contain/hold other controls in it. The contained controls are known as child 
controls.
7 What happens to container control and its child controls if you delete
(i) The container control, 
(ii) A child control
(iii) All child controls?
Ans: (i) If container control is deleted then with container control child control will be also deleted
(ii) If a child control is deleted then the container control will be remain and a child control will be deleted.
(iii) If all child controls is deleted then the container control will be remain and all the child control will be 
deleted.
8 Name the character set supported by java.
Ans: Java uses the Unicode character set.
9 What are keywords? Can keywords be used as identifiers?
Ans:  Keywords are the words that convey a special meaning to the language compiler. These are reserved for 
special purpose.
 Keywords cannot be used as identifiers. 
10 What is an identifier? What is the identifier forming rule of java?
Ans:  Identifiers are user define names for different parts of program.
 Identifier forming rules of java state the following:
1. Identifiers can have alphabets, digits, and underscore and dollar sign characters.
2. They must not be a keyword or Boolean literal or null literal.
3. They must not begin with a digit.
4. They can be of any length.
5. Java is case sensitive i.e., upper-case letters and lower case letters are treated differently.
11 Is java case sensitive? What is meant by the term ‘case sensitive’?
Ans:  Java is case sensitive.
 Case sensitive meant upper-case letters and lower case letters are treated differently.
12 Which of the following are valid identifiers and why/why not?

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SOME INFORMATION ABOUT JAVA OPERATORS.

Java Operators

❮ PreviousNext ❯

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Java Operators

Operators are used to perform operations on variables and values.

The value is called an operand, while the operation (to be performed between the two operands) is defined by an operator:

Operand	Operator	Operand
100	+	50

In the example below, the numbers 100 and 50 are operands, and the + sign is an operator:

Example

int x = 100 + 50;

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Although the + operator is often used to add together two values, like in the example above, it can also be used to add together a variable and a value, or a variable and another variable:

Example

int sum1 = 100 + 50;        // 150 (100 + 50)int sum2 = sum1 + 250;      // 400 (150 + 250)int sum3 = sum2 + sum2;     // 800 (400 + 400)

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Java divides the operators into the following groups:

• Arithmetic operators
• Assignment operators
• Comparison operators
• Logical operators
• Bitwise operators

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Arithmetic Operators

Arithmetic operators are used to perform common mathematical operations.

Operator	Name	Description	Example	Try it
+	Addition	Adds together two values	x + y	Try it »
-	Subtraction	Subtracts one value from another	x - y	Try it »
*	Multiplication	Multiplies two values	x * y	Try it »
/	Division	Divides one value from another	x / y	Try it »
%	Modulus	Returns the division remainder	x % y	Try it »
++	Increment	Increases the value of a variable by 1	++x	Try it »
--	Decrement	Decreases the value of a variable by 1	--x	Try it »

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Java Assignment Operators

Assignment operators are used to assign values to variables.

In the example below, we use the assignment operator (=) to assign the value 10 to a variable called x:

Example

int x = 10;

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The addition assignment operator (+=) adds a value to a variable:

Example

int x = 10;
x += 5;

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A list of all assignment operators:

Operator	Example	Same As	Try it
=	x = 5	x = 5	Try it »
+=	x += 3	x = x + 3	Try it »
-=	x -= 3	x = x - 3	Try it »
*=	x *= 3	x = x * 3	Try it »
/=	x /= 3	x = x / 3	Try it »
%=	x %= 3	x = x % 3	Try it »
&=	x &= 3	x = x & 3	Try it »
|=	x |= 3	x = x | 3	Try it »
^=	x ^= 3	x = x ^ 3	Try it »
>>=	x >>= 3	x = x >> 3	Try it »
<<=	x <<= 3	x = x << 3	Try it »

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Java Comparison Operators

Comparison operators are used to compare two values:

Operator	Name	Example	Try it
==	Equal to	x == y	Try it »
!=	Not equal	x != y	Try it »
>	Greater than	x > y	Try it »
<	Less than	x < y	Try it »
>=	Greater than or equal to	x >= y	Try it »
<=	Less than or equal to	x <= y	Try it »

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Java Logical Operators

Logical operators are used to determine the logic between variables or values:

Operator	Name	Description	Example	Try it
&&	Logical and	Returns true if both statements are true	x < 5 &&  x < 10	Try it »
||	Logical or	Returns true if one of the statements is true	x < 5 || x < 4	Try it »
!	Logical not	Reverse the result, returns false if the result is true	!(x < 5 && x < 10)