人类说话,中国人说汉语，美国人说英语

继承实现

/javaDemo6/src/com/imooc/PErson.java

package com.imooc;  public class Person {     public void say() {         System.out.PRintln("人类具有说话的能力");     } } 

/javaDemo6/src/com/imooc/Chinese.java

package com.imooc;  public class Chinese extends Person{     public void say() {         System.out.println("中国人说汉语");     } } 

/javaDemo6/src/com/imooc/american.java

package com.imooc;  public class American extends Person{     public void say() {         System.out.println("美国人说英语");     } } 

/javaDemo6/src/com/imooc/test.java

package com.imooc;   public class Test {      public static void main(String[] args) {         // TODO Auto-generated method stub         Chinese p1 = new Chinese();         American p2 = new American();         p1.say();         p2.say();     }  } 

抽象类实现

/javaDemo6/src/com/imooc/APerson.java

package com.imooc;  public abstract class APerson {     public abstract void say(); } 

/javaDemo6/src/com/imooc/Chinese.java

package com.imooc;  public class Chinese extends APerson{     public void say() {         System.out.println("中国人说汉语");     } } 

/javaDemo6/src/com/imooc/American.java

package com.imooc;  public class American extends APerson{     public void say() {         System.out.println("美国人说英语");     } } 

/javaDemo6/src/com/imooc/Test.java

package com.imooc;   public class Test {      public static void main(String[] args) {         // TODO Auto-generated method stub         APerson p1 = new Chinese();         APerson p2 = new American();         p1.say();         p2.say();     }  }