java 嵌套例子

kenson · 发表于 2021-5-30 12:01

package com.kenson;

class Outer{
private int a = 10;
int b = 100;

private String outerName = "outerName";

public static class StaticNetstedClass{
public void print() {
// 通过实例访问，可以访问private变量
System.out.println(new Outer().outerName);
}
}

//内部类
class Inner{
int c = 200;

class LocInner1{
void Disp() {
System.out.println("This is a LocInner1 Disp");
}
}
}

//外部方法
public void Display() {
System.out.println("a=" + a);
//局部内部类
class LocalInner{
String ln = "I am a Local Inner Class";

void Disp() {
System.out.println(ln);
}
}

LocalInner ln = new LocalInner();
System.out.println(ln.ln);

//声明匿名对像
new LocalInner().Disp();
System.out.println(new Outer().a);
}

}

public class HelloWorld {

public static void main(String[] args) {
Outer outer = new Outer();
System.out.println(outer.b);

outer.Display();

Outer.Inner inner = outer.new Inner();
System.out.println(inner.c);

Outer.StaticNetstedClass staticClass = new Outer.StaticNetstedClass();
staticClass.print();

}

}

kenson · 发表于 2021-5-30 12:02

结果 100
a=10
I am a Local Inner Class
I am a Local Inner Class
10
200
outerName

kenson · 发表于 2021-5-31 12:02

匿名例子

abstract class Bird {
private String name;

public String getName() {
      return name;
}

public void setName(String name) {
      this.name = name;
}

public abstract int fly();
}

public class Test {

public void test(Bird bird){
      System.out.println(bird.getName() + "能够飞 " + bird.fly() + "米");
}

public static void main(String[] args) {
      Test test = new Test();
      test.test(new Bird() {  //new bird 是一个匿名对像，从而调用了TEST类的test()方法

         public int fly() {
            return 10000;
         }

         public String getName() {
            return "大雁";
         }
      });
}
}

------------------
Output：
大雁能够飞 10000米

更多：
https://www.jianshu.com/p/0950c6787c7d

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