20210220内部类

 

https://mubu.com/doc/75Nn9c3thOq

 

package mianshi_0219;

import java.awt.*;
import java.awt.event.*;
import java.util.*;

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

public class InnerClassTest {
    public static void main(String[] args){
        TalkingClock clock =new TalkingClock();
        clock.start(1000,true);
        JOptionPane.showMessageDialog(null, "Quit program?");
    }
}    
    class TalkingClock{
//        private int interval;
//        private boolean beep;
//        
//        public TalkingClock(int interval,boolean beep){
//            this.interval=interval;
//            this.beep=beep;
//        }
        
public void start(int interval,boolean beep){
//            class TimePrinter implements ActionListener{
//                public void actionPerformed(ActionEvent event){
//                    System.out.println("At the tone,the time is"+new Date());
//                    if(beep) Toolkit.getDefaultToolkit().beep();
//                }
//            }
    
    ActionListener listener=new ActionListener(){
        public void actionPerformed(ActionEvent event){
            System.out.println("At the tone,the time is"+new Date());
                if(beep) Toolkit.getDefaultToolkit().beep();
            }
        };
        
        Timer t=new Timer(interval,listener);
            
        t.start();
    }
    


}
    

 

package mianshi_0219;

public class StaticInnerClassTest {
	 public static void main(String[] args) {
	        double[] d = new double[20];
	        for (int i = 0; i <d.length ; i++) {
	            d[i] = 100 *Math.random();
	            ArrayAlg.Pair p = ArrayAlg.minmax(d);
	            System.out.println("min = "+p.getFirst());
	            System.out.println("max = "+p.getSecond());
	        }
	    }
	    static class ArrayAlg{
	        public static class Pair{
	            private double first;
	            private double second;
	        public Pair(double f,double s){
	            first = f;
	            second = s;
	        }
	        public double getFirst(){
	            return first;
	        }
	        public double getSecond(){
	            return second;
	        }
	        }
	        public static Pair minmax(double[] values){
	            double min = Double.POSITIVE_INFINITY;
	            double max = Double.NEGATIVE_INFINITY;
	            for (double v:values) {
	                if (min > v)min = v;
	                if (max < v)max = v;
	            }
	            return new Pair(min,max);
	        }
	    }
}