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The difference between break and continue

2022-06-21 20:28:00 【[official recommendation] Tangcheng】

1.break

use break Statement can make the process jump out of switch Statement of body , It can also be used. break Statement terminates the loop body in the loop structure , So as to end the cycle of this layer ahead of time .

Instructions ：

（1） Only in circulation and switch In the body of a sentence break;

（2） When break In the circulatory body switch In the body of a sentence , It works just to get out of the way switch Statement of body , Does not terminate the execution of the loop body . If you want to force the execution of the loop body , It can be in the loop body , But it's not switch Set... In the statement break sentence , If certain conditions are satisfied, you will jump out of the loop .

2.continue

continue The function of the statement is to skip the remaining unexecuted statements in the body of this loop , Immediately carry out the next cycle condition determination , It can be understood as only ending this cycle .

Be careful ：continue Statement does not terminate the entire loop .

Extended data ： stay while and do-while In circulation ,continue Statement causes the process to jump directly to the test part of the loop control condition , And then decide whether the cycle continues . stay for loop in , encounter continue after , Skip the remaining statements in the body of the loop , And go right for Statement “ expression 3” evaluation , Then proceed “ expression 2” Condition test of , According to the “ expression 2” The value of for loop Whether to carry out . Recycle the body , Regardless of continue As a component of what kind of sentence , All will be executed according to the above functions , With this break Somewhat different .

Extended reading ：

break： This statement causes the program to terminate the loop that contains it , And proceed to the next stage of the process （ The statement after the whole loop ）, namely , Instead of jumping to the next cycle, exit the cycle . If break sentence Contained in nested loops , It just jumps out of the innermost loop .

The following code

public class Test {

    public static void main(String[] args) {

        for(int i=0; i<10; i++){

            if(i==5){

                break;

            }

            System.out.print(i+" ");

        }

    }

}

You can see the program output 01234 To 5 I jumped out of the loop

continue: Loop statement When there is this statement in , When the program runs this statement , Not in execution The loop body in continue Instead, the following statement jumps to the entry of the next loop and executes the next loop .

hold break Change it to continue

public class Test {

    public static void main(String[] args) {

        for(int i=0; i<10; i++){

            if(i==5){

                continue;

            }

            System.out.print(i+" ");

        }

    }

}

You can see that only 5 No output , That is, when i=5 Printing operation was not performed when , Go straight to the next cycle

and return Yes means to return from the called function to the calling function and continue to execute , Return with a return value , from return Later parameter assignment .return Then the function ends , The following statement is no longer executed

public class Test {
    public static void fun(){

        for(int i=0; i<10; i++){
            if(i==5){
                return;
            }
            System.out.print(i+" ");
        }
        System.out.println("hello");
    }

    public static void main(String[] args) {
        fun();
    }

}

You can see the back hello It didn't print out

Extended reading ：break,continue,return The difference between

1)break     Jump right out of the current cycle , Start from outside of the current loop , Ignore any other statements and loop condition tests in the loop body . He can only jump out of a circle , If your loop is nested , Then you need to follow your nesting level , Step by step break To jump out .

2)continue     It's also the end of the current cycle , But he doesn't jump out of the loop , But continue to judge the loop condition execution statement . He can only end one cycle , But you can't stop the loop and continue .

3)return Statements can be used to make The branching program returns to the method calling it .( Puzzled )

amplifying return

return Indicates to abort the operation of the current function , And return the operation right to the caller .
If it's in main Function , Means to return the operation right to the operating system .

return It is not necessary to return a value .

  void   func(void)    
  {    
  ......    
  ......    
  return;    
  }

Of course , Even if you don't write return, After the function is executed, the operation right will also be returned to the caller . Write return It's a clear style , Can prevent some unexpected errors . So the book only says that it should write , Instead of having to write .
If you meet a certain condition and want to quit , It can be used return return , Otherwise, you can not write this code , When the program is executed to “}” Will automatically return to , In fact, you can know this problem by trying it on the machine . But as a good programming habit , It is true that every function has a return statement , This is more readable , And facilitate the maintenance of the program ～～～～

return One instruction is to return a specified data to the calling function ,

Another function is end The execution of the function ...

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