子类覆盖父类

1：类属性

父类：

public class Father {
    public String field = "父类变量";
    public final String finalField = "父类常量";
    public static String staticField = "父类静态变量";
    public static final String staticFinalField = "父类静态常量";
}

子类：

public class Son extends Father {
    public String field = "子类变量";
    public final String finalField = "子类常量";
    public static String staticField = "子类静态变量";
    public static final String staticFinalField = "子类静态常量";

    public static void main(String[] args) {
        System.out.println(Son.staticField);
        System.out.println(Son.staticFinalField);

        Father son1 = new Son();
        System.out.println(son1.field);
        System.out.println(son1.finalField);

        Son son2 = new Son();
        System.out.println(son2.field);
        System.out.println(son2.finalField);
    }
}

执行结果：



2：类方法

父类：

public class Father {

    /**
     * 
     */
    public final void TestFinal() {
        System.out.println("父类--这是一个final方法");
    }
}

子类：

评论

1 楼 liuna2011 2012-01-21  

public class Son extends Father {
    public void Test() {
        System.out.println("子类--重写父类方法");
    }

    public static void main(String[] args) {
        Father s = new Son();
        s.Test();
    }
}

public class Son extends Father {
    public void Test() {
        System.out.println("子类--重写父类方法");
    }

    public static void main(String[] args) {
        Son s = new Son();
        s.Test();
    }
}

以上两种写法，打印结果都是：子类--重写父类方法