Why can't this() and super() both be used together in a constructor?

Question

Why can\'t this() and super() both be used together in a constructor?

What is the reason for incorporating such a thing?

Answer 1

this() and super(), both are the constructors that's why must be the first statement. But we can use both in a program.

this(): It is used to call, same class Default or Parametrized Constructor.

super(): It is used to call, immediate super/parent class Default or Parametrized Constructor.

//Super Class
    public class SuperConstructor {
    SuperConstructor(){
        this(10);
        System.out.println("Super DC");
    }

    SuperConstructor(int a){
        this(10,20);
        System.out.println("Suer SPC with Iteger");
    }

    SuperConstructor(int i,int j){
        System.out.println("Super with  DPC with Iteger and Integer");
    }
}


//subclass
    public class ThisConstructor extends SuperConstructor{  
    ThisConstructor(){
        this(10,20);
        System.out.println("Subcalss DC ");//DC Default Constructor
    }

    ThisConstructor(int i){
        super(i);       
        System.out.println("Subcalss  SPC with Iteger");//SPC Single Parameterized Constructor
    }

    ThisConstructor(int i, String s){
        this();
        System.out.println("Subcalss  DPC with Iteger and String");//DPC double Parameterized Constructor
    }

    ThisConstructor(int i,int age){
        super(i,age);
        System.out.println("Subcalss  DPC with Iteger and Integer");
    }

    public static void main(String []k){
        System.out.println("=================Frist time Calling ==========================\n");
        ThisConstructor t = new ThisConstructor(1);


        System.out.println("=================Second time Calling ==========================\n");
        ThisConstructor t1 = new ThisConstructor(1,2);
    }
}