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Example

Test two values to find out if 20 is greater than 18. If the condition is true, print some text:

if (20 > 18) {

  System.out.println("20 is greater than 18");

}

 

Definition and Usage

The if statement specifies a block of Java code to be executed if a condition is true.

Java has the following conditional statements:

  • Use if to specify a block of code to be executed, if a specified condition is true
  • Use else to specify a block of code to be executed, if the same condition is false
  • Use else if to specify a new condition to test, if the first condition is false
  • Use switch to specify many alternative blocks of code to be executed

More Examples

Example

Use the if statement to test variables:

int x = 20;

int y = 18;

if (x > y) {

  System.out.println("x is greater than y");

}

 

Example

Use the else statement to specify a block of code to be executed if the condition is false.

int time = 20;

if (time < 18) {

  System.out.println("Good day.");

} else {

  System.out.println("Good evening.");

}

// Outputs "Good evening."

 

Example

Use the else if statement to specify a new condition if the first condition is false.

int time = 22;

if (time < 10) {

  System.out.println("Good morning.");

} else if (time < 20) {

  System.out.println("Good day.");

} else {

  System.out.println("Good evening.");

}

// Outputs "Good evening."

 

Related Pages

Read more about conditions in our Java If...Else Tutorial.

 

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