package com.oop.demo10;
public class Outer {
private int id = 10;
public void out(){
System.out.println("这是外部类的方法");
}
public class Inner{
public void in(){
System.out.println("这是内部类的方法");
}
//获得外部类的私有属性
public void getID(){
System.out.println(id);
}
}
}
package com.oop;
import com.oop.demo10.Outer;
public class Application {
public static void main(String[] args) {
//new
Outer outer = new Outer();
//通过这个外部类来实例化内部类
Outer.Inner inner = outer.new Inner();
inner.getID();
}
}
package com.oop.demo10;
public class Outer {
}
//一个java类中可以有多个 class 类,但是只能有一个 public class
class A{
public static void main(String[] args) {
}
}
package com.oop.demo10;
public class Outer {
//局部内部类
public void method(){
class Inner{
public void in(){
}
}
}
}
package com.oop.demo10;
//思维、操作
public class Test {
public static void main(String[] args) {
//没有名字初始化类,不用将实例保存到变量中
new Apple().eat();
//匿名内部类
new UserSevice(){
@Override
public void hello() {
}
};
}
}
class Apple{
public void eat(){
System.out.println("1");
}
}
interface UserSevice{
void hello();
}