Java 继承后成员的隐藏与重写(示例详解)
作者：我命由我12345
在Java中,继承是一种允许新类（子类）继承另一个类（父类）的成员（包括字段、方法等）的特性,本文给大家介绍了Java 继承后成员的隐藏与重写,感兴趣的朋友跟随小编一起看看吧
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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