Shulou(Shulou.com)06/02 Report--

This article is about examples of the use of loop structures in Java. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

The basic structure of Java programming-Loop structure

Text keywords: basic structure, loop structure, while, do-while, for

I. the basic structure of the cycle

For convenience, we can divide the loop structure into four parts to describe. Of course, these four parts do not have to appear, and even when they do not appear, they can form a circular structure. Moreover, for different loop structures, the relative position of each part is also different.

1. Initialization section

Before entering the loop structure, you can define some variables that are used in the loop and after the end of the loop, and assign values.

two。 Judgment condition part

Used to determine whether to continue the loop, and if it is false, the loop ends. The judgment part can directly use a Boolean variable or an expression, but you must ensure that the result of the expression is of Boolean type.

3. Circulatory body part

The core part of the loop structure, used to write code that you want to repeat each time, usually designed according to the function of the program.

4. Iterative part

Used to assist in controlling the end of the loop, executed after the body of the loop, such as variable self-increment, etc.

Similar to the judgment structure, when the curly braces are not used, the loop structure can only control one line of code, and we usually add enlarged parentheses

2. While cycle 1. Loop structure [initialization part] while (condition judgment part) {loop body [iterative part]} 2. Cycle characteristics

For while loops, it is usually used when the number of loops is uncertain, such as letting the user decide when to exit the loop.

You can use a Boolean variable to directly determine whether the loop continues or not

You can jump out of the loop at any time with the break keyword

End the cycle when the condition judgment part fails.

Initialization and iteration can be omitted

If a semicolon appears after the conditional judgment part, it will cause the structure to end directly.

3. Sample program

Loop output 1 to 9

Public static void main (String [] args) {/ / initialization part int I = 1; / / conditions for loop execution to continue in parentheses: while (I) when I value is less than or equal to 9

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.