Loops In Java

Loops are used to repeat a block of code as long as a specified condition is true.

for Loop

The for loop is used when you know in advance how many times you want to execute a statement or a block of statements.

Syntax:

for (initialization; condition; update) {
    // Code to execute
}

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public class ForLoopExample {    public static void main(String[] args) {        for (int i = 0; i < 5; i++) {            System.out.println("i = " + i);        }    }}

Output

i = 0
i = 1
i = 2
i = 3
i = 4

while Loop

The while loop repeats a block of code as long as a condition is true. It's useful when you don't know in advance how many times the loop should run.

Syntax:

while (condition) {
    // Code to execute
}

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public class WhileLoopExample {    public static void main(String[] args) {        int i = 0;        while (i < 5) {            System.out.println("i = " + i);            i++;        }    }}

Output

i = 0
i = 1
i = 2
i = 3
i = 4

do-while Loop

The do-while loop is similar to the while loop, but the condition is checked after the loop body is executed. This guarantees that the loop will run at least once.

Syntax:

do {
    // Code to execute
} while (condition);

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public class DoWhileExample {    public static void main(String[] args) {        int i = 0;        do {            System.out.println("i = " + i);            i++;        } while (i < 5);    }}

Output

i = 0
i = 1
i = 2
i = 3
i = 4

Loops In Java

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