Using this.var during var's initialization [duplicate]

Answer 1

Nothing wrong in this. this keyword refers the current object and it is used to differentiate the local variable and instance variable. The value of local variable can be assigned into instance variable likewise, the vice verse also possible. That means we can assign the value of instance variable into a local variable.

refer the chapter 4.12.3 Kinds of Variables from http://docs.oracle.com/javase/specs/jls/se7/jls7.pdf (page 80). The example also given here.

      **Example 4.12.3-1. Different Kinds of Variables**
      class Point { 
      static int numPoints; // numPoints is a class variable 
      int x, y; // x and y are instance variables 
      int[] w = new int[10]; // w[0] is an array component 
      int setX(int x) { // x is a method parameter 
        int oldx = this.x; // oldx is a local variable 
        this.x = x; 
        return oldx; 
      } 
    }