Java While Loop - Understanding and Examples

Learn how the Java while loop works and how to use it to execute code repeatedly based on a condition. Master looping concepts for automating repetitive tasks in your Java programs.

Java While Loop

Loops in programming execute a block of code repeatedly as long as a specified condition is true. They are useful for automating repetitive tasks.

Syntax

while (condition) {
// code block to be executed
}

Example

int i = 0;
while (i < 5) {
System.out.println(i);
i++;
}

0
1
2
3
4

Explanation: In this example, the while loop continues to execute the code block inside it as long as the variable i is less than 5. Each time the loop iterates, i is incremented by 1 until it reaches 5.

Note: It's important to ensure that the condition within the while loop eventually becomes false, otherwise the loop will continue indefinitely, resulting in an infinite loop.

Java While Loop Examples

int countdown = 3;

while (countdown > 0) {
System.out.println(countdown);
countdown--;
}

System.out.println("Happy New Year 2023!!");

3
2
1
Happy New Year 2023!!

int dice = 1;

while (dice <= 6) {
if (dice < 6) {
System.out.println("Sad.");
} else {
System.out.println("Hurray!");
}
dice = dice + 1;
}

Sad.
Sad.
Sad.
Sad.
Sad.
Hurray!