java
public class A{
    private int x=0;
    public A(){ this(x); x++; System.out.print(x);}
    public A(int x){ this.x+=x;}
    public A(int x,int y){ this.x+=y+x;}
}
public class B extends A{
    private int x=17;
    public B(){ this(2,2); 
        System.out.print(x); }
    public B(int x,int y){ super(x,y); }
}
public class programs5{
    public static void main(){
        A obj=new B();
    }
}

class Shape {
    protected int x; 

    String
    public Shape(String x) {
        this.x = Integer.parseInt(x);
        System.out.println("Shape constructor called with x = " + this.x);
    }

   
    public Shape() {
        this.x = 0; 
        System.out.println("Default Shape constructor called with x = " + this.x);
    }
}

class Circle extends Shape {
    private int radius;

    
    public Circle(int radius) {
        this.radius = radius;
        this.x = 0;  
        System.out.println("Circle constructor called with radius = " + this.radius);
    }

    public void show() {
        System.out.println("Radius: " + radius);
        System.out.println("Shape's x: " + this.x); 
    }
}

public class Program4 {
    public static void main(String[] args) {
        Circle c1 = new Circle(10);
        c1.show();

}}

class Shape {
    protected int x;

    public Shape(int x, int y) {
        this.x = x;
        System.out.println("Shape constructor called with x = " + this.x);
    }
}

class Circle extends Shape {
    private int radius;

    public Circle(int x, int radius) {
        
        this.radius = radius;
        System.out.println("Circle constructor called with radius = " + this.radius);
    }
}


public class Main {
    public static void main(String[] args) {
        Circle circle = new Circle(10, 5);  
    }
}

interface InterfaceA {
    default void display() {
        System.out.print("#");
    }
}

interface InterfaceB {
    void display();  // دالة مجردة
}

class ImplementationClass implements InterfaceA, InterfaceB {
    @Override
    public void display() {
        System.out.println("Display method in ImplementationClass");
    }
}

public class Main {
    public static void main(String[] args) {
        ImplementationClass obj = new ImplementationClass();

        obj.display();   
    }
}