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class X{
	
	int x;
	
	X(int x){
		System.out.println("X Constructor");
		this.x = x;
	}
}
class Y extends X{
	int y;
	
	Y(int x, int y){
		super(x);		//superキーワード(コンストラクタ)
		System.out.println("Y Constructor");
		this.y = y;
	}
}
class Z extends Y{
	
	int z;
	
	Z(int x, int y, int z){
		super(x, y);	//superキーワード(コンストラクタ)
		System.out.println("Z Constructor");
		this.z = z;
	}
}
//
public class TestCons {
	public static void main(String[] args) {
		
		System.out.println("Start");
		//
		System.out.println("------------------------");
		
		
		//
		Z Obj = new Z(1, 2, 3);
		System.out.println("X -> "	+ Obj.x);
		System.out.println("Y -> "	+ Obj.y);
		System.out.println("Z -> "	+ Obj.z);
		System.out.println("");			
		
		//
		System.out.println("------------------------");
		
		System.out.println("End");
		
	}
}
			
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