A small question about the for loop

There are the following procedures:

 Package com.lk.b;  Public class TEST5 {    publicstaticvoid  main (string[] args) {        // TODO auto-generated Method stub         for (int i=0;i<10;i++)             New Integer (i);            System.out.println ("Hello World");}    }

There may be a lot of people think this is right, in fact you are wrong, this program is not compiled by the compiler, because the integer k = new integer (i) this sentence. The For loop may not use {}, but is limited to executing statements (where the variable life statement is not included), since the scope of the integer k in this code is scoped to the entire main method, resulting in a duplicate definition of the variable error. Therefore, errors occur at compile time. To correct this, just add a pair of curly braces and let the variable be declared inside the block. As follows:

1  Packagecom.lk.b;2 3  Public classTEST5 {4 5      Public Static voidMain (string[] args) {6         //TODO auto-generated Method Stub7          for(inti=0;i<10;i++){8Integer k =NewInteger (i);9         }TenSystem.out.println ("Hello World"); One     } A  -}

A small question about the for loop