1： 2：例子
package java1; public class java3 { public static void main(String[] args) { int i=1;//初始化 while(i<=10)//每轮开始之前，判断条件是否成立 { System.out.print(i + " "); i++; } } } /*1 2 3 4 5 6 7 8 9 10 Process finished with exit code 0 */3：例子
package java1; public class java3 { public static void main(String[] args) { int i = 1;//初始化 while (true) { if (i > 10) { break; } System.out.print(i + " "); i++; } } } /*1 2 3 4 5 6 7 8 9 10 Process finished with exit code 0 */