Detailed explanation of the use of break&continue keywords

Use of break&continue keywords

break: Used in switch...case statements or loop structure statements to end the current loop.

Sample code:

 1 public class TestBreak { 2     public static void main(String[] args) { 3         for(int i = 1; i <= 5; i++){ 4             if(i % 4 == 0){ 5                 break;//如果满足i对4取余为零，即i可以被4整除时执行break关键字，跳出循环，后续语句均不执行，在这个循环里i最大值为5，所以这里只有4可以被4整除所以打印语句只会打印1-3的值 6             } 7             System.out.println("i="+i); 8         } 9     }10 }

Use the break keyword in nested loops:

 1 public class TestBreak { 2     public static void main(String[] args) { 3         //两层循环 4         for(int i = 1; i <= 5; i++){ 5             for(int j = 1; j <= 5; j++){ 6                 if(j % 4 == 0){ 7                     break; //由于是两层循环，而break关键字使用在内层循环，如果满足条件，则只会跳出内层循环，再次进入外层循环执行语句 8                 } 9                 System.out.print("j="+j+"\t");10                 //所以会打印外层循环规定的次数的J的值，但依旧不会打印4之后的数字11             }12             System.out.println();13         }14     }15 }

continue: Used in loop structure statements to indicate the end of the current loop.

Sample code:

 1 public class TestContinue { 2     public static void main(String[] args) { 3         //需要和break关键字区分开，所以讲循环条件改为10，可以更清晰的看出break和continue的区别 4         for(int i = 1; i <= 10; i++){ 5             if(i % 4 == 0){ 6                 continue;//如果满足i对4取余为零，即i可以被4整除时执行continue关键字，结束本次循环，本次循环的后续语句均不执行，但下一次的循环语句若不满足被4整除的条件则会照常执行 7             } 8             System.out.print("i="+i+"\t"); 9         }10         //运行后会发现有两个数字没有打印，但是后续不满足该条件的却都打印出来，和break关键字截然不同11     }12 }

Use the continue keyword in nested loops:

 1 public class TestContinue { 2     public static void main(String[] args) { 3         //两层循环 4         for(int i = 1; i <= 5; i++){ 5             for(int j = 1; j <= 10; j++){ 6                 if(j % 4 == 0){ 7                     continue; //由于是两层循环，而continue关键字使用在内层循环，如果满足条件，则只会结束本次内层循环，执行下一次内层循环语句 8                 } 9                 System.out.print("j="+j+"\t");10                 //所以会打印外层循环规定的次数的J的值，但不会打印能够被4整除的数字11             }12             System.out.println();13         }14     }15 }

Supplementary information:

Both break and continue have a newly added function. When performing multi-layer nested loops, if you want to use the break and continue keywords to end a loop that is not the current layer but a certain layer, you can follow the keywords. Add a label. The label name can be named by yourself, such as English label

. At the same time, you also need to add a label in front of the for keyword of the loop layer you want to end:, Also use label as an example - label:for(int i=0; loop condition; iteration){}.

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