java 入门级（类 继承 入门）

/*
 * To change this license header choose License Headers in Project Properties.
 * To change this template file choose Tools | Templates
 * and open the template in the editor.
 */
package javaapp913;

import java.util.ArrayList;

/**
 *
 * @author wangwei
 */
public class Father {
    private String FirstName;
    private String LastName;
    private int Age;
    private String Country;
    private ArrayList sons = new ArrayList（）;
    public ArrayList addSon（Son son）{
           if（sons!=null&&son!=null）{
               sons.add（son）;
           }
           return sons;
    }
    public String getFirstName（） {
        return FirstName;
    }
    public String getName（） {
        return this.FirstName+this.LastName;
    }
    public int getAge（） {

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件          0  2018-09-26 21:29  JavaApp913\JavaApp913\build\classes\.netbeans_automatic_build

     文件          0  2018-09-26 21:29  JavaApp913\JavaApp913\build\classes\.netbeans_update_resources

     文件       2358  2018-09-26 21:29  JavaApp913\JavaApp913\build\classes\javaapp913\Father.class

     文件       2379  2018-09-27 10:23  JavaApp913\JavaApp913\build\classes\javaapp913\JavaApp913.class

     文件       1510  2018-09-26 21:29  JavaApp913\JavaApp913\build\classes\javaapp913\Son.class

     文件       3615  2018-09-13 11:02  JavaApp913\JavaApp913\build.xml

     文件         85  2018-09-13 11:02  JavaApp913\JavaApp913\manifest.mf

     文件      79885  2018-09-13 11:02  JavaApp913\JavaApp913\nbproject\build-impl.xml

     文件        475  2018-09-13 11:02  JavaApp913\JavaApp913\nbproject\genfiles.properties

     文件          0  2018-09-26 21:36  JavaApp913\JavaApp913\nbproject\private\config.properties

     文件        183  2018-09-27 10:16  JavaApp913\JavaApp913\nbproject\private\private.properties

     文件        676  2018-09-26 21:38  JavaApp913\JavaApp913\nbproject\private\private.xml

     文件       3854  2018-09-27 10:17  JavaApp913\JavaApp913\nbproject\project.properties

     文件        518  2018-09-13 11:02  JavaApp913\JavaApp913\nbproject\project.xml

     文件       1842  2018-09-26 21:22  JavaApp913\JavaApp913\src\javaapp913\Father.java

     文件       1626  2018-09-27 10:23  JavaApp913\JavaApp913\src\javaapp913\JavaApp913.java

     文件       1220  2018-09-26 21:22  JavaApp913\JavaApp913\src\javaapp913\Son.java

     目录          0  2018-09-27 10:23  JavaApp913\JavaApp913\build\classes\javaapp913

     目录          0  2018-09-26 21:26  JavaApp913\JavaApp913\build\generated-sources\ap-source-output

     目录          0  2018-09-26 21:26  JavaApp913\JavaApp913\build\test\classes

     目录          0  2018-09-26 21:26  JavaApp913\JavaApp913\build\test\results

     目录          0  2018-09-26 21:29  JavaApp913\JavaApp913\build\classes

     目录          0  2018-09-26 21:26  JavaApp913\JavaApp913\build\empty

     目录          0  2018-09-26 21:26  JavaApp913\JavaApp913\build\generated-sources

     目录          0  2018-09-26 21:26  JavaApp913\JavaApp913\build\test

     目录          0  2018-09-26 21:36  JavaApp913\JavaApp913\nbproject\private

     目录          0  2018-09-13 11:58  JavaApp913\JavaApp913\src\javaapp913

     目录          0  2018-09-26 21:26  JavaApp913\JavaApp913\build

     目录          0  2018-09-13 11:02  JavaApp913\JavaApp913\nbproject

     目录          0  2018-09-13 11:02  JavaApp913\JavaApp913\src

............此处省略6个文件信息