Java Conditional Statement

Published by Admin on 22/04/202022/04/2020

In Java Conditional Statements, Java uses Boolean variables to evaluate conditions. Boolean value is returned when true and false when an expression is compared or evaluated.

Following Java Conditional Statements:-

1. if statement

If a condition is true, use the if statement to specify a block of Java code to execute.

Syntax

if (condition1) {
    // if the condition1 is true, then execute this block.
}

Example

if (10 > 8) {
    System.out.println("10 is greater than 8.");
}

2. else statement

Syntax

if (condition2) {
    // if the condition2 is true, then execute this block.
} else {
    // if the condition2 is false then execute this block.
}

Example

int a = 10;
if (a < 7) {
  System.out.println("in if = " + a);
} else {
  System.out.println("in else = " + a);
}

ternary (? : ) Operator

Ternary operator same as if else statement.

Syntax

variable = (condition) ? expressionTrue :  expressionFalse;

int a1 = 10;
String result = (a1 < 8) ? "in if block value= " + a1 : "in else block value= " + a1;
System.out.println(result);

3. nested if statement

When there is an one or more if statement inside a if statement, it is called the nested if statement.

Syntax

if(first condition) {
   if(second condition) {
   }
}

Example

int number = 70;
if(number < 100 ){ 
    System.out.println("number is less than 100."); 
    if(number > 50){
        System.out.println("number is greater than 50.");
    }
}
// Output
number is less than 100
number is greater than 50

4. switch case statement

Use the switch case statement to select one of several code blocks to be executed.

Syntax

switch(expression) {
  case a:
    // code block
    break;
  case b:
    // code block
    break;
  case c:
    // code block
    break;
  default:
    // code block
}

• The switch expression is evaluated once.
• The value of the expression is match with the values of each case.
• If a match occurs, the corresponding block of code is executed.
• The break and default keywords are optional.

Example

int gender = 2;
switch (gender) {
  case 1:
    System.out.println("Male");
    break;
  case 2:
    System.out.println("Female");
    break;
  default:
    // This 'default' keyword specifies some code to run if there is no case match
    System.out.println("Other");
}
// Outputs
Female

Question :-

• What is “if statement” in Java?
• How to work switch case in Java?
• How many Java Conditional Statements available in java?
• What is ternary (? : ) Operator in Java?
• What is use of break keyword in Java?
• How to work switch statement in Java with examples?
• If Ternary operator same as if else statement In Java?