在Java中,如何跳出当前的多重嵌套循环?
package cn.hgnulb.package0324;
/**
* 参考:https://blog.csdn.net/amen_wu/article/details/53913319
*/
public class Demo {
public static void main(String[] args) {
System.out.println("方法一:标号方式");
outerloop:
for (int i = 1; i < 5; i++) {
for (int j = 1; j < 5; j++) {
if (i * j > 6) {
System.out.println("Breaking");
break outerloop;
}
System.out.println(i + " " + j);
}
}
System.out.println("Done");
System.out.println("方法二:条件控制");
boolean finished = false;
for (int i = 1; i < 5 && !finished; i++) {
for (int j = 1; j < 5; j++) {
if (i * j > 6) {
System.out.println("Breaking");
finished = true;
break;
}
System.out.println(i + " " + j);
}
}
System.out.println("Done");
System.out.println("方法二变形:条件控制");
for (int i = 1; i < 5; i++) {
for (int j = 1; j < 5; j++) {
if (i * j > 6) {
System.out.println("Breaking");
i = 5;
break;
}
System.out.println(i + " " + j);
}
}
System.out.println("Done");
System.out.println("方法三:抛出异常");
try {
for (int i = 1; i < 5; i++) {
for (int j = 1; j < 5; j++) {
if (i * j > 6) {
System.out.println("Breaking");
throw new Exception();
}
System.out.println(i + " " + j);
}
}
System.out.println("Done");// 此行代码不会执行
} catch (Exception e) {
// System.out.println("e");
}
}
}
参考答案
方法一:标号方式
1 1
1 2
1 3
1 4
2 1
2 2
2 3
Breaking
Done
方法二:条件控制
1 1
1 2
1 3
1 4
2 1
2 2
2 3
Breaking
Done
方法二变形:条件控制
1 1
1 2
1 3
1 4
2 1
2 2
2 3
Breaking
Done
方法三:抛出异常
1 1
1 2
1 3
1 4
2 1
2 2
2 3
Breaking
方法一:标号方式
System.out.println("方法一:标号方式");
outerloop:
for (int i = 1; i < 5; i++) {
for (int j = 1; j < 5; j++) {
if (i * j > 6) {
System.out.println("Breaking");
break outerloop;
}
System.out.println(i + " " + j);
}
}
System.out.println("Done");
参考答案
方法一:标号方式
1 1
1 2
1 3
1 4
2 1
2 2
2 3
Breaking
Done
方法二:条件控制
System.out.println("方法二:条件控制");
boolean finished = false;
for (int i = 1; i < 5 && !finished; i++) {
for (int j = 1; j < 5; j++) {
if (i * j > 6) {
System.out.println("Breaking");
finished = true;
break;
}
System.out.println(i + " " + j);
}
}
System.out.println("Done");
参考答案
方法二:条件控制
1 1
1 2
1 3
1 4
2 1
2 2
2 3
Breaking
Done
System.out.println("方法二变形:条件控制");
for (int i = 1; i < 5; i++) {
for (int j = 1; j < 5; j++) {
if (i * j > 6) {
System.out.println("Breaking");
i = 5;
break;
}
System.out.println(i + " " + j);
}
}
System.out.println("Done");
参考答案
方法二变形:条件控制
1 1
1 2
1 3
1 4
2 1
2 2
2 3
Breaking
Done
方法三:抛出异常
System.out.println("方法三:抛出异常");
try {
for (int i = 1; i < 5; i++) {
for (int j = 1; j < 5; j++) {
if (i * j > 6) {
System.out.println("Breaking");
throw new Exception();
}
System.out.println(i + " " + j);
}
}
System.out.println("Done");// 此行代码不会执行
} catch (Exception e) {
// System.out.println("e");
}
参考答案
方法三:抛出异常
1 1
1 2
1 3
1 4
2 1
2 2
2 3
Breaking