If

You can utilize these conditions to execute various actions based on different decisions. Java provides the following conditional statements:

• ‘if’: To specify a block of code for execution if a specified condition is true.
• ‘else’: To specify a block of code for execution if the same condition is false.
• ‘else if’: To specify a new condition for testing if the first condition is false.
• ‘switch’: To specify multiple alternative code blocks for execution.

The if Statement

Use an if statement to define a block of Java code that will be executed if a specified condition is true.

Syntax

if (condition) {  
  // block of code to be executed if the condition is true
}

In the given example, we evaluate two values to determine whether 20 exceeds 18.
If this condition proves true, display a specified text.


Example

if (20 > 18) {
  System.out.println("20 is greater than 18");
}

Variables can also undergo testing:


Example

int x = 20;
int y = 18;
if (x > y) {
  System.out.println("x is greater than y");
}

Example explained

In the example above, we use two variables, x and y, to check if x is greater than y using the > operator. Since x is 20 and y is 18, and we know that 20 is greater than 18, we print "x is greater than y" to the screen.