> 时：
> java时循环是一种控制流语句，用于重复执行语句块，直到给定条件评估为false为止。一旦条件变为false，执行程序中的循环后立即行。 java中的while循环的语法：
while (test_expression) {
// statements
update_expression;
}
condition is evaluated before each iteration of the loop
if condition is true, the code block inside the while loop will execute
the process repeats until condition is false
java中的while循环执行：控件进入ware循环。
测试条件。
- 如果false，请退出循环。
- 执行身体后，更新循环变量。 >
- 从步骤2重复直到条件为错误。
-
example 1: display numbers from 1 to 5 // program to display numbers from 1 to 5 class main { public static void main(string[] args) { // declare variables int i = 1, n = 5; // while loop from 1 to 5 while(i <= n) { system.out.println(i); i++; } } } output: 1 2 3 4 5任务1：
program:
public class count {
public static void main(string[] args) {
int count=1;
while (count<=5){
count=count+1;
system.out.println("count: "+count);
}
}
}
output:
count: 2
count: 3
count: 4
count: 5
count: 6
>任务2：
program:
public class count1 {
public static void main(string[] args) {
int count=5;
while (count>=1) {
count=count-1;
{
system.out.println("count:" +count);
}
}
}
}
output:
count:4
count:3
count:2
count:1
count:0
任务3：
program:
public class count2 {
public static void main (string args[])
{
int count=0;
while(count<10) {
count=count+2;
{
system.out.println("count:" +count);
}
}
}
}
output:
count:2
count:4
count:6
count:8
count:10
>任务4：
program:
public class Count3 {
public static void main (String args[])
{
int count=1;
while(count<=10) {
count=count+2;
{
System.out.println("count:" +count);
}
}
}
}
output:
count:3
count:5
count:7
count:9
count:11
参考：
