alphatwo.java

北大Java 语言程序设计 ppt课件及源码

package Two;
import One.*;

public class AlphaTwo extends Alpha {
    public static void main(String[] args) {
        Alpha a = new Alpha();
      //a.privateMethod();       //illegal
      //a.packageMethod();       //illegal
      //a.protectedMethod();     //illegal
        a.publicMethod();        //legal

      //System.out.println("iamprivate: " + a.iamprivate);       //illegal
      //System.out.println("iampackage: " + a.iampackage);       //illegal
      //System.out.println("iamprotected: " + a.iamprotected);   //illegal
        System.out.println("iampublic: " + a.iampublic);         //legal

        AlphaTwo a2 = new AlphaTwo();
        a2.protectedMethod();     //legal
        System.out.println("iamprotected: " + a2.iamprotected);   //legal
    }
}