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  • Override (1)

    See a sample:
    ———-TestOverride.java———–
    package ch.allenstudy.newway02;

    public class TestOverride {
    public static void main(String[] zhangsan)
    {
    B bb = new B();
    bb.f();
    }
    }
    class A
    {
    public void f()
    {
    System.out.printf(“AAAA\n”);
    }
    }
    class B extends A
    {
    public void f() //this is OVERRIDE the method f();
    {
    System.out.printf(“BBBB\n”);
    }
    }
    ———Result———
    BBBB

    Whether we also can call the f() method of the superclass in B’s f() method?
    Yes, we can.
    Just add one line as below:
    ———-TestOverride.java———–
    package ch.allenstudy.newway02;

    public class TestOverride {
    public static void main(String[] zhangsan)
    {
    B bb = new B();
    bb.f();
    }
    }
    class A
    {
    public void f()
    {
    System.out.printf(“AAAA\n”);
    }
    }
    class B extends A
    {
    public void f() //this is OVERRIDE the method f();
    {
    super.f(); //super 就是指父类。所以这里就调用了父类的 f() 方法。
    System.out.printf(“BBBB\n”);
    }
    }
    ———Result———
    AAAA
    BBBB

    虽然我们这里实现了在override 方法的时候调用superclass的方法,但是很少有这么用的。

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  • 原文地址:https://www.cnblogs.com/backpacker/p/2271566.html
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