if

Example

Evaluate whether 20 is greater than 18; if true, print a specified text.

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

Definition and Usage

The “if” statement delineates a segment of Java code to be executed when a condition evaluates to true.

In Java, the following conditional statements are available:

• Employ “if” to designate a code block for execution if a particular condition is true.
• Utilize “else” to designate a code block for execution if the same condition is false.
• Implement “else if” to introduce a new condition for testing if the initial condition is false.
• Employ “switch” to designate multiple alternative code blocks for execution.

More Examples

Example

Utilize an if statement to evaluate variables.

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

Example

Employ the else statement to define a code block for execution 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

Utilize the else if statement to introduce a new condition if the initial condition is false.

int time = 20;
if (time < 18) {
  System.out.println("Good morning.");
} else if (time < 20) {
  System.out.println("Good day.");
} else {
  System.out.println("Good evening.");
}
// Outputs "Good evening."