How to use the do while statement in Java

This article mainly explains "how to use the do while statement in Java". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let Xiaobian take you to learn "how to use the do while statement in Java"!

do-while syntax analysis

Let's start by understanding the do-while syntax:

do { // statements} while (expression);

Note: The last semicolon cannot be omitted, otherwise it will prompt compilation error.

do-while use scenario

After many searches and consultations, I finally found two relatively satisfactory use scenarios. Let's look at them together.

Use scenario 1: grab tickets

For the ticket-snatching business, regardless of 37 21, first snatch and then judge whether the ticket-snatching is successful. If the ticket-snatching is successful, exit the loop, otherwise continue to execute the ticket-snatching. The pseudo-code implemented is as follows:

do { //Ticket code...} while (failed to get tickets);

Usage scenario: binary conversion

After a lot of searching, it is found that in the JDK source code, there are also a small number of scenarios using do-while, such as Integer binary conversion, the relevant source code is as follows:

static int formatUnsignedInt(int val, int shift, char[] buf, int offset, int len) { int charPos = len; int radix = 1 >>= shift; } while (val != 0 && charPos > 0); return charPos;}

For example, decimal conversion to binary will perform this method. In the business of binary conversion, no matter what, at least one binary conversion will be performed, so this business scenario is very suitable for do-while.

At this point, I believe that everyone has a deeper understanding of "how to use the do while statement in Java," so let's actually operate it! Here is the website, more related content can enter the relevant channels for inquiry, pay attention to us, continue to learn!