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形参和返回值

七千22 2022-03-13 阅读 68

类名或抽象类名作为形参和返回值:

一个包内有好几个文件,在这里展开太麻烦这里有链接

形参和返回值案例https://download.csdn.net/download/weixin_49033047/84582894

接口作为形参和返回值:

接口作为形参和返回值icon-default.png?t=M276https://download.csdn.net/download/weixin_49033047/84709098

成员内部类:

 outer

package _3._190;

public class Outer {
    private int num=10;


    /*public class Inner{
        public void show(){
            System.out.println(num);
        }
    }*/


    private class Inner{
        public void show(){
            System.out.println(num);
        }
    }
    public void method(){
        Inner i=new Inner();
        i.show();
    }
}

outerDemo

package _3._190;

public class OuterDemo {
    public static void main(String[] args) {
        /*Outer.Inner oi=new Outer().new Inner();
        oi.show();*/

        Outer o=new Outer();
        o.method();
    }
}

局部内部类:

outer

package _3._191;

public class Outer {
    private int num = 10;

    public void method() {
        class Inner {
            public void show() {
                System.out.println("num="+num);
            }
        }
        Inner i = new Inner();
        i.show();
    }
}

outerDemo

package _3._191;

public class OuterDemo {
    public static void main(String[] args) {
        Outer o=new Outer();
        o.method();
    }
}

匿名内部类

Inter

package _3._192;

public class Inter {
    public void Show(){}
}

Outer

package _3._192;

public class Outer {
    public void mrthod(){
        new Inter(){
            @Override
            public void Show() {
                System.out.println("匿名内部类");
            }
        }.Show();
    }
}

OuterDemo

package _3._192;

public class OuterDemo {
    public static void main(String[] args) {
        Outer o=new Outer();
        o.mrthod();
    }
}

匿名内部类练习

Jumpping

package _3._193;

public interface Jumpping {
    void jump ();
}

JumppingDemo

package _3._193;

public class JumppingDemo {
    public static void main(String[] args) {
        JumppingOperator jo=new JumppingOperator();
        jo.method(new Jumpping() {
            @Override
            public void jump() {
                System.out.println("猫可以跳高了");
            }
        });
    }
}

JumppingOperaor

package _3._193;

public class JumppingOperator  {
    public void method(Jumpping j){
        j.jump();
    }
}

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