Accessing Object variable and primitive variable

public static void main(String[] args) {

    test t;

    test s=new test();

    s.y=12;

    t=s;

    s.y++;

    System.out.println(s.y+"\t"+t.y);

    int k,j=12;

    k=j;

    j++;

    System.out.println(k+"\t"+j);

    }

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OUTPUT

13        13

12        13