abstract

package study.test;

/**
 * @see 抽象类One
 * @author FenglinZ
 * @version 1.0
 */
public abstract class AbsOne {

 /**
  * @see 获取字符
  * @return 获取的字符
  */
 public abstract String getString();

 /**
  * @see 显示获取的字符
  */
 public void Show() {
  System.out.print("Show:");
  System.out.println(getString());
 }
}
-----------------------------------------
package study.test;

public class Two extends AbsOne {

 @Override
 public String getString() {
  return this.getClass().getName();
 }
 
}
--------------------------------------------
package study.test;

public class Three extends AbsOne {

 @Override
 public String getString() {
  return this.getClass().getName();
 }

}

--------------------------------------------
package study;

import study.test.AbsOne;
import study.test.Two;
import study.test.Three;

/**
 * @see 执行程序
 * @author FenglinZ
 * @version 1.0
 */
public class Execute {

 /**
  * @see 执行程序
  * @param args
  *            参数
  */
 public static void main(String[] args) {
  AbsOne abs = null;
  abs = new Two();
  abs.Show();
  abs = new Three();
  abs.Show();
 }

}