我要评论java 继承后成员的隐藏与重写
1、子类没有定义成员
- basecommonstore.java
public class basecommonstore {
public static final string tag = "tag:" + basecommonstore.class.getsimplename();
public static void sayhello() {
system.out.println(tag + " sayhello");
}
public string tag = "tag:" + basecommonstore.class.getsimplename();
public void sayok() {
system.out.println(tag + " sayok");
}
}- commonstore.java
public class commonstore extends basecommonstore {
}
- test
system.out.println(commonstore.tag); commonstore.sayhello(); commonstore commonstore = new commonstore(); system.out.println(commonstore.tag); commonstore.sayok();
# 输出结果 tag:basecommonstore tag:basecommonstore sayhello tag:basecommonstore tag:basecommonstore sayok
2、子类定义同名成员
- basecommonstore.java
public class basecommonstore {
public static final string tag = "tag:" + basecommonstore.class.getsimplename();
public static void sayhello() {
system.out.println(tag + " sayhello");
}
public string tag = "tag:" + basecommonstore.class.getsimplename();
public void sayok() {
system.out.println(tag + " sayok");
}
}- commonstore.java
public class commonstore extends basecommonstore {
public static final string tag = "tag:" + commonstore.class.getsimplename();
public static void sayhello() {
system.out.println(tag + " sayhello");
}
public string tag = "tag:" + commonstore.class.getsimplename();
public void sayok() {
system.out.println(tag + " sayok");
}
}- test
system.out.println(commonstore.tag); commonstore.sayhello(); commonstore commonstore = new commonstore(); system.out.println(commonstore.tag); commonstore.sayok();
# 输出结果 tag:commonstore tag:commonstore sayhello tag:commonstore tag:commonstore sayok
小结
| 成员 | 示例 1 | 示例 2 |
|---|---|---|
| 静态变量 | 继承父类 | 隐藏父类 |
| 静态方法 | 继承父类 | 隐藏父类 |
| 实例变量 | 继承父类 | 隐藏父类 |
| 实例方法 | 继承父类 | 重写父类 |
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