用基类，接口，本类实例化对象的区别

废话不多说了，代码很清楚

写个基类FatherClass.java

package com;

public class FatherClass {
	
	public void speak(){
		System.out.println("Father method,speak() ");
	}
	public void sing(){
		System.out.println("Father method,sing() ");
	}
	public void jump(){
		System.out.println("Father method,jump() ");
	}
	public void run(){
		System.out.println("Father method,run() ");
	}

}

写个接口MotherInterface.java

package com;

public interface  MotherInterface {
	
	public void cook();
	public void clean();
	public void love();

}

写具体的类SonClass.java

package com;

public class SonClass extends FatherClass implements MotherInterface{

	@Override
	public void cook() {
		// TODO Auto-generated method stub
		System.out.println("Son method cook()");
	}

	@Override
	public void clean() {
		// TODO Auto-generated method stub
		System.out.println("Son method clean()");
	}

	@Override
	public void love() {
		// TODO Auto-generated method stub
		System.out.println("Son method love()");
	}
	
	////////////////////重载基类方法///////////////////////////////////
	public void jump(){
		System.out.println("Son method,jump(),extends FatherClass ");
	}
	public void run(){
		System.out.println("Son method,run(),extends FatherClass");
	}
	////////////////////写自己的方法///////////////////////////////////
	public void myMehtod(){
		System.out.println("Son method,myMehtod(),我自己的方法");
	}
	public static void main(String[] ss){
		//用基类实例对象，对象只有基类方法
		//（如果重载基类方法，走重载的那个方法）
		FatherClass fc=new SonClass();
		//用接口实例对象，对象只有接口方法
		//这些方法必须实现
		MotherInterface mi=new SonClass();
		//用本类实例对象，既有基类方法（有重载方法走重载的那个）;
		//又有接口方法(接口方法必须实现);还有自己本类的独有的方法。
		SonClass son=new SonClass();
		
		System.out.println("--------基类实例的对象fc------------");
		fc.speak();
		fc.sing();
		fc.jump();
		fc.run();
		System.out.println("--------接口实例的对象mi------------");
		mi.cook();
		mi.clean();
		mi.love();
		System.out.println("--------本类实例的对象son------------");
		son.speak();
		son.sing();
		son.jump();
		son.run();
		son.cook();
		son.clean();
		son.love();
		son.myMehtod();
	}

}

控制台打印：

--------基类实例的对象fc------------
Father method,speak()
Father method,sing()
Son method,jump(),extends FatherClass
Son method,run(),extends FatherClass
--------接口实例的对象mi------------
Son method cook()
Son method clean()
Son method love()
--------本类实例的对象son------------
Father method,speak()
Father method,sing()
Son method,jump(),extends FatherClass
Son method,run(),extends FatherClass
Son method cook()
Son method clean()
Son method love()
Son method,myMehtod(),我自己的方法