抽象类可以没有抽象方法，不能被实例化

抽象类可以没有抽象方法，不能被实例化

 

father class

/** * */package testAbstract;/** * @author 2172980000502 * */public abstract class Father {protected void fatherSay() {// TODO Auto-generated method stubSystem.out.println("I am a father class!");}} 

 

son class

/** * */package testAbstract;/** * @author 2172980000502 * */public class Son extends Father {protected void sonSay() {// TODO Auto-generated method stubSystem.out.println("I am a son class!");}} 

 

应用入口

/** * */package testAbstract;/** * @author 2172980000502 * */public class TestAbstract {/** * @param args */public static void main(String[] args) {// father class can not been new// Father f = new Father();Son s = new Son();s.sonSay();}}