The use of jump statements in java

There are three jump structures in java: break continue return
break: used to exit from any statement block.
1. It ends the entire loop and jumps to the end of the loop;
eg: Outputs a loop from 1 to 10, but stops when it is greater than 2 and a multiple of 3

Java code

public static void main(String[] args){    
for(int i=1;i<10;i++){  
           if(i>2&&i%3==0){  
       break;}  
    System.out.println(i);  
    }  
  System.out.println("结束");}  
//输出结果就是1,2,结束。

2. In the switch statement Jump to the end of switch;
eg: Xiao Ming ran second in the school sports meeting. What was the reward he got?

Java code

public static void main(String[] args){  
     int paiming i=2;  
     switch(paiming){  
         case 1:  
             System.out.println("冠军");  
               break;  
         case 2:  
              System.out.println("亚军");  
               break;  
         case 3:  
             System.out.println("季军");  
               break;  
         default:  
         System.out.println("什么都没有！！");  
}}  
  //输出的结果就是“亚军”；在判断排名之后就会直接执行case 对应的数值，在break跳出整个switch。

3. Define an alias for the for loop, and then use the break alias; it means jumping to the end of the specified outer loop.
eg: Output * when there are 5 characters in the line, the outer label will pop up;

Java code

public class ForLoop{    
   public static void main(String[] args){    
       outer:for(int i=0;i<5;i++){    
           for(int j=0;j<10;j++){    
               if(j==5)    
                  break outer;    
                System.out.print("*");      
           }    
           System.out.print("\r\n");      
       }            
   }    
   
  
//输出：*****。break 别名   直接跳出别名的循环。

Return: End the entire function and jump to the end of the function
eg: Output an even number from 1 to 10, when it is greater than 5 is the end.

Java code

public class uuu {  
    public static void main(String[] args){  
        for(int i=1;i<10;i++){  
            if(i%3==0){  
                System.out.println(i);  
            }  
            if(i>5){  
                return;  
            }  
        }  
    }  
}  
//输出结果：2 4 6。当输出到6的时候判断到大于5就return结束了这个函数。

Continue: End the current loop and jump to the next loop

eg: Output numbers from 1 to 6, but 3 cannot be output.

Java code

public class one{  
   public static void main(String[] args){  
   for(int i=1;i<=6;i++){  
      if(i==3){  
        continue;  
         }  
        System.out.println(i);  
    }  
   }  
}  
  // 输出的结果：1,2,4,5,6.只有3不会输出，continue是结束当前次的循环。