Detailed explanation of the execution order of java for loop

As shown below:

 for (expression 1; expression 2; expression 3) { //loop body}

First execute "Expression 1", then make the judgment of "Expression 2". If it is true, execute "loop body". After the loop body is executed, execute expression 3.

For example

 for(int i=0;i<2;i++){//TODO}

Execute int i = 0 first;

Then judge i<2

Then execute the function body

Finally execute i++

Then reincarnate to judge i<2

 int[] arr = new int[3]; int j; arr[0] = 1; arr[1] = 2; arr[2] = 3; int searchKey = 3; for( j=0;j<arr.length ;j++){ System.out.println("j1================================================================================================================================================================; if(arr[j] == searchKey){ break; } } System.out.println("j2=========================================;

Running results

j1===========0
j1============1
j1===========2
j2===========2

 int[] arr = new int[3];int j;arr[0] = 1;arr[1] = 2;arr[2] = 3;int searchKey = 4;for( j=0;j<arr.length ;j++){ System.out.println("j1==============================================================================================================================================================; if(arr[j] == searchKey){ break; }}System.out.println("j2========================================;

Running results

j1===========0
j1============1
j1===========2
j2===========3

Comparing the above two pieces of code and the running results, after break in the loop body, expression 3 will not be executed, that is, the last time j++ in the first block of code is not executed.

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