simple program when we use this keyword (Java) (210)

package com.company;
class test
{
    private int a;
    public test(int a)
    {
        this.a=a;
    }
    public int returna()
    {
        return a;
    }
}
public class Program47 {
    public static void main(String[] args) {
        test obj=new test(7);
        System.out.print("the value of a is : ");
        System.out.println(obj.returna());
    }}