Difference Between 2 Codes Of Same Output

I am new to Java language. Here, I have two Java code examples which prints out same output as expected.

What is the basic differences of these two programs. And, in which situations we should use this programs.

CODE NUMBER: 1_

public class ToStringDemo_1 {
     double height;
     double width;
     double depth;
     ToStringDemo_1(double arg1, double arg2, double arg3){
          height = arg1;
          width = arg2;
          depth = arg3;

[Code] ....