while

package ch4;/*** Created by Jiqing on 2016/11/6.*/
public class While {public static void main(String[] args) {int count =0;while(count <10) {System.out.println(count);count++;} // 输出0~9System.out.println("循环结束");}
}

doWhile

package ch4;/*** Created by Jiqing on 2016/11/6.*/
public class doWhile {public static void main(String[] args) {int count = 1;// 至少执行一次do {System.out.println(count);count++;} while (count < 10);// 0~9System.out.println("循环结束");}
}

For

package ch4;/*** Created by Jiqing on 2016/11/6.*/
public class For {public static void main(String[] args) {for(int count = 0; count <10 ;count++) {System.out.println(count);}System.out.println("循环结束！");int count = 0;for (; count < 10 ;) {System.out.println(count);count++;}System.out.println("循环结束！");}
}

Continue

package ch4;/*** Created by Jiqing on 2016/11/6.*/
public class Continue {public static void main(String[] args) {for (int i = 0;i<5;i++) {System.out.println("i的值"+i);if (i == 1) {continue;}System.out.println("continue后的语句"+i);/**i的值0continue后的语句0i的值1i的值2continue后的语句2i的值3continue后的语句3i的值4continue后的语句4*/}outer:for (int i = 0;i<5;i++) {for (int j = 0;j<3;j++) {System.out.println("i的值"+i+"，j的值"+j);if (j == 1) {continue outer;}}}/**i的值0，j的值0i的值0，j的值1i的值1，j的值0i的值1，j的值1i的值2，j的值0i的值2，j的值1i的值3，j的值0i的值3，j的值1i的值4，j的值0i的值4，j的值1*/}
}

Break

package ch4;/*** Created by Jiqing on 2016/11/6.*/
public class Break {public static void main(String[] args) {for (int i=0;i<10;i++) {System.out.println("i的值是"+i);if (i == 2) {break; // 跳出该循环}}/**i的值是0i的值是1i的值是2*/outer:for (int i = 0;i<5;i++) {for (int j = 0;j<3;j++) {System.out.println("i的值"+i+"，j的值"+j);if (j == 1) {break outer;}}}/**i的值0，j的值0i的值0，j的值1*/}}

Return

package ch4;/*** Created by Jiqing on 2016/11/6.*/
public class Return {public static void main(String[] args) {for (int i = 0;i<5;i++) {for (int j = 0;j<3;j++) {System.out.println("i的值"+i+"，j的值"+j);if (j == 1) {break; // 跳出本次循环}}}System.out.println("===================");for (int i = 0;i<5;i++) {for (int j = 0;j<3;j++) {System.out.println("i的值"+i+"，j的值"+j);if (j == 1) {return; // 直接结束循环,相当于break outer}}}}
}
//        i的值0，j的值0
//        i的值0，j的值1
//        i的值1，j的值0
//        i的值1，j的值1
//        i的值2，j的值0
//        i的值2，j的值1
//        i的值3，j的值0
//        i的值3，j的值1
//        i的值4，j的值0
//        i的值4，j的值1
//        ===================
//        i的值0，j的值0
//        i的值0，j的值1

数组

package ch4;/*** Created by Jiqing on 2016/11/9.*/
public class Array {public static void main(String[] args) {int[] intArr;intArr = new int[]{5,4,8,20};Object[] objArr;objArr = new String[]{"Java","李刚"};// 定义和初始化同时完成int[] a = {5,6,7,9};System.out.println(a[1]); // 6System.out.println(intArr[1]); // 4System.out.println(objArr[1]); // 李刚// 循环输出for(int i = 0;i<a.length;i++) {System.out.println(a[i]);}for (Object obj : objArr) {System.out.println(obj);}for (int i : a) {System.out.println(i);}}
}本文转自TBHacker博客园博客，原文链接：http://www.cnblogs.com/jiqing9006/p/6048933.html，如需转载请自行联系原作者