匿名内部类的构造方法

最新推荐文章于 2022-01-27 03:45:37 发布

elsostal

最新推荐文章于 2022-01-27 03:45:37 发布

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文章标签： java

本文链接：https://blog.youkuaiyun.com/elsostal/article/details/120871146

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这段代码展示了Java中匿名内部类的使用，包括如何创建匿名类的实例，重写父类方法，以及在实例初始化块中打印语句。在main方法中，分别调用了getBase、getBase1和getBase2方法，输出了不同匿名类的构造过程和方法执行结果。

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public class AnonymousConstructor {
    public static Base getBase(int i){
        return new Base(i) {
        	//创建匿名类的构造方法的办法
            {
                System.out.println("Inside instance initializer");
            }
            @Override
            public void f() {
                System.out.println("In anonymous f()");
            }
        };
    }

    public static Base1 getBase1(){
        return new Base1() {

            {
                System.out.println("Base1 Inside instance initializer");
            }

            @Override
            public void f() {
                System.out.println("Base1 In anonymous f()");
            }
        };
    }

    public static Base2 getBase2(final int i){
        return new Base2(i){
            {
                System.out.println("anonymous constructer,i = " + i);
                System.out.println("Base2 Inside instance initializer");
            }
            @Override
            void f() {
                super.f();
                System.out.println("Base2 In anonymous f()");
            }
        };
    }


    public static void main(String[] args) {
        Base base = getBase(47);
        base.f();
        Base1 base1 = getBase1();
        base1.f();
        Base2 base2 = getBase2(1);
        base2.f();
    }
}
abstract class Base {
    Base(int i) {
        System.out.println("Base constructor, i = " + i);
    }
    public abstract void f();
}

interface Base1{
    void f();
}

class Base2{
    Base2(int i){
        System.out.println("Base2 constructor, i = " + i);
    }

    void f(){
        System.out.println("Base2 f()");
    }

}

这段代码输出：

Base constructor, i = 47
Inside instance initializer
In anonymous f()
Base1 Inside instance initializer
Base1 In anonymous f()
Base2 constructor, i = 1
anonymous constructer,i + 1
Base2 Inside instance initializer
Base2 f()
Base2 In anonymous f()