The role of do in java

The do loop in Java is a post-test loop with conditional judgment. The loop body is executed first and then the loop condition is judged to ensure that the loop body is executed at least once.

The role of do in Java

do is a loop statement in Java; Post-test loop with conditional judgment, that is, execute the loop body first and then judge the loop condition.

Syntax:

do {
  // 循环主体
} while (条件);

Function:

do loop

Execute the loop body at least once, even if The condition is false. Unlike a while loop, a while loop only executes the body of the loop when the condition is true.

Usage scenarios:

do loop is usually used in the following scenarios:

At least one operation needs to be performed
• Loop The conditions are determined in the loop body

Process:

1. Execute the loop body: do The loop is executed first and contained in the loop body statement.
2. Judgment conditions: After executing the loop body, judge the loop conditions.
3. Condition is true: If the condition is true, continue executing the loop body.
4. Condition is false: If the condition is false, exit the loop.

Example:

int number = 10;
do {
  System.out.println(number);
  number++;
} while (number <= 15);

Output:

<code>10
11
12
13
14
15</code>

In this example, the loop body is executed at least once, Then determine whether the condition number is less than or equal to 15. If the condition is true, continue executing the loop body, otherwise exit the loop.

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