A do-while loop in Java is a control flow statement that allows you to execute a block of code repeatedly until a condition is met. The do-while loop is similar to a while loop, but the difference is that the do-while loop always executes the loop body at least once, even if the condition is false.
Here's the basic syntax of a do-while loop in Java:
do {
// Loop body
} while (condition);
The loop body is executed first, and then the condition is evaluated. If the condition is true, the loop body is executed again. This process is repeated until the condition becomes false.
Here's an example of how you can use a do-while loop in Java:
int i = 0;
do {
System.out.println(i);
i++;
} while (i < 5);
In this example, the loop body will print the value of i and then increment it by 1. The loop will continue to execute as long as i is less than 5. The output of this loop will be:
0 1 2 3 4
Note that the condition is evaluated at the end of each iteration, so the loop body is always executed at least once. This is different from a while loop, which checks the condition before executing the loop body.
You can use a do-while loop to perform a task repeatedly until a certain condition is met, or to execute a block of code at least once before entering a while loop. You can also use a break statement inside the loop body to exit the loop prematurely, or a continue statement to skip the rest of the current iteration and move on to the next one.