内部类代码

package com.yj.fenghao.indoor;

import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Date;

import javax.swing.Timer;

/**内部类
 * 内部类可以是私有类  ---内部类既可以访问自身的数据域，也可以访问构造他的外围类对象的数据域
 * 编译器修改类内部类的构造器，添加了对外部类的引用
 * <P>Description: TODO</P>
 * @ClassName: TimerClock
 * @author 冯浩  2017年4月5日 下午1:19:08
 * @see TODO
 */

public class TimerClock {
    
    private int intervel;
    private boolean beep;
    public TimerClock(int intervel, boolean beep) {
        super();
        this.intervel = intervel;
        this.beep = beep;
    }
    
    public class TimerPrinter implements ActionListener{

//        private TimerClock out;
//        public TimerPrinter(TimerClock out){
//            this.out=out;
//        }
        
        public void actionPerformed(ActionEvent e) {
            Date date=new Date();
            System.out.println("at the now ,this is "+date);
            if(beep){
                Toolkit.getDefaultToolkit().beep();
            }
//            if(out.beep){
//                Toolkit.getDefaultToolkit().beep();
//            }
        }
        
    }
    
    public void start(){
//        ActionListener listener=new TimerPrinter(this);
        ActionListener listener=new TimerPrinter();
        Timer t=new Timer(intervel,listener);
        t.start();
        
    }

}

package com.yj.fenghao.indoor;

import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Date;

import javax.swing.Timer;

import com.yj.fenghao.indoor.TimerClock.TimerPrinter;

/**
 * 局部内部类---作用域被限定在定义这个类的块中-----不仅能够访问包含他们的外部类，还能访问局部变量（必须定义成final）
 * <P>Description: TODO</P>
 * @ClassName: TimerClock2
 * @author 冯浩  2017年4月6日 上午8:36:02
 * @see TODO
 */
public class TimerClock2 {
    
    private int intervel;
    private boolean beep;
    public TimerClock2(int intervel, boolean beep) {
        super();
        this.intervel = intervel;
        this.beep = beep;
    }
    
      public void start(){
            class TimerPrinter implements ActionListener{
                public void actionPerformed(ActionEvent e) {
                    Date date=new Date();
                    System.out.println("at the now ,this is "+date);
                    if(beep){
                        Toolkit.getDefaultToolkit().beep();
                    }
                    
                }
                
            }
            ActionListener listener=new TimerPrinter();
            Timer t=new Timer(intervel,listener);
            t.start();
            
        }

}

package com.yj.fenghao.indoor;

import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.swing.Timer;

import com.yj.fenghao.indoor.TimerClock.TimerPrinter;

/**
 * 匿名内部类---不能有构造器，将构造器参数传递给超类
 * <P>Description: TODO</P>
 * @ClassName: TimerClock2
 * @author 冯浩  2017年4月6日 上午8:36:02
 * @see TODO
 */
public class TimerClock3 {
    
    private int intervel;
    private boolean beep;
    public TimerClock3(int intervel, boolean beep) {
        super();
        this.intervel = intervel;
        this.beep = beep;
    }
    
      public void start(){
           
            ActionListener listener=new ActionListener(){

                public void actionPerformed(ActionEvent e) {
                    Date date=new Date();
                    System.out.println("at the now ,this is "+date);
                    if(beep){
                        Toolkit.getDefaultToolkit().beep();
                    }
                }
                
            };
            Timer t=new Timer(intervel,listener);
            t.start();
            
        }
      
      public void t(){
          this.test(new ArrayList(){{add("111");add("22222");}});
      }
      public void test(List<String> list){
          
      }

}

package com.yj.fenghao.indoor;


/**
 * 静态内部类-没有对生成他的外围类的引用
 * <P>Description: TODO</P>
 * @ClassName: StaticInnerClass
 * @author 冯浩  2017年4月6日 上午9:09:31
 * @see TODO
 */
public class StaticInnerClass {
    
    public static void main(String[] args) {
        double[] d=new double[20];
        for (int  i= 0; i < d.length; i++) {
            d[i]=Math.random()*100;
        }
        ArrayAlg.Pair minMax = ArrayAlg.Pair.minMax(d);
        System.out.println(minMax.getFirst());
        System.out.println(minMax.getSecond());
    }
    
    
    

}
class ArrayAlg{
    public static class Pair{
        private double first;
        private double second;
        public Pair(double first, double second) {
            super();
            this.first = first;
            this.second = second;
        }
        public double getFirst() {
            return first;
        }
        public double getSecond() {
            return second;
        }
        
        public static Pair minMax(double[] values){
            double maxValue = Double.MAX_VALUE;
            double minValue = Double.MIN_VALUE;
            for (double d : values) {
                if(d>maxValue)maxValue=d;
                if(d<minValue)minValue=d;
            }
            return new Pair(maxValue,minValue);
        }
        
        
    }
}

内部类的简单代码，需要的时候看一下

关于这个定时器的完整功能代码，挺好玩的

package com.yj.fenghao.indoor;

import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Date;

import javax.swing.*;
import javax.swing.Timer;


public class TimerTest {
    public static void main(String[] args) {
        
        ActionListener listener=new TimerPrinter();
        Timer t=new Timer(1000,listener);
        t.start();
        JOptionPane.showMessageDialog(null, "are you ok !");
        System.exit(0);
    }
    
    

}
class TimerPrinter implements ActionListener{

    public void actionPerformed(ActionEvent e) {
        Date date=new Date();
        System.out.println("at the tone ,this time is +"+date);
        Toolkit.getDefaultToolkit().beep();
        
    }
    
}