inheritance.java

来自「有关ＪＤＢＣ」· Java 代码 · 共 33 行

import java.io.*;

class SuperClass{
	int x=0;
	SuperClass( ){
	x=5;
	System.out.println("in SuperClass : x=" +x);
	}
	void doSomething( ){
		System.out.println("in SuperClass.doSomething()");
	}
	}

class SubClass extends SuperClass {
	int x=0;
	SubClass( ){
		super( );//调用父类的构造方法
		x=5;//super( ) 要放在方法中的第一句
		System.out.println("in SubClass :x="+x);
	}
	void doSomething( ) {
	super.doSomething( );//调用父类的方法
	System.out.println("in SubClass.doSomething()");
	System.out.println("super.x="+super.x+" sub.x="+x);
	}
}
public class Inheritance {
	public static void main(String args[]) {
		SubClass subC=new SubClass();
		subC.doSomething();
	}
}