package jisuanji;

import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.*;
public class DateComparison extends JFrame implements ActionListener{
	int []a=new int[3];
	int []b=new int[3];
	JTextField field1=new JTextField(10);
	JTextField field2=new JTextField(10);
	JButton button=new JButton("开始比较");
	JPanel panel1=new JPanel();
	JPanel panel2=new JPanel();
	JLabel label1=new JLabel();
	JLabel label2=new JLabel();
	JLabel label3=new JLabel();
	DateComparison(){
		init();  
    	setTitle("DateComparison");
    	setBounds(600, 360, 480, 220);
    	setVisible(true);
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);}
	public void init(){
		setLayout(new BorderLayout());
		panel1.setLayout(new FlowLayout());
		panel2.setLayout(new FlowLayout());
		label1.setText("and");
		label2.setText(null);
		label3.setText("请在文本框输入需要比较的日期，格式：2021.6.11");
		label1.setFont(new Font("宋体", Font.PLAIN, 20));
		label2.setFont(new Font("宋体", Font.PLAIN, 20));
		label3.setFont(new Font("宋体", Font.PLAIN, 18));
		button.addActionListener(this);
		panel1.add(field1);
		panel1.add(label1);
		panel1.add(field2);
		panel1.add(button);
		panel2.add(label2);
		add(label3,BorderLayout.NORTH);
		add(panel1,BorderLayout.CENTER);
		add(panel2,BorderLayout.SOUTH);
	}
	public void actionPerformed(ActionEvent e) {
		if(e.getSource()==button){
			a=getDate(field1.getText());
			b=getDate(field2.getText());
			String x=work(a,b);
			label2.setText(x);
		}	
	}
	public int[] getDate(String str){
		int []c=new int[3];
		Scanner scanner=new Scanner(str);
		scanner.useDelimiter("[.]+");
		int k=0;
		while(scanner.hasNext()){
			c[k++]=scanner.nextInt();
			}
		return c;
	}
	public String work(int []a,int []b){
		  String re = null;
		  String rx;
		  int yearOne=a[0];
		  int monthOne=a[1];
		  int dayOne=a[2];
		  int yearTwo=b[0];
		  int monthTwo=b[1];
		  int dayTwo=b[2];
	      Calendar calendar=Calendar.getInstance();
	      calendar.set(yearOne, monthOne-1, dayOne);
	      long time1=calendar.getTimeInMillis();
	      calendar.set(yearTwo, monthTwo-1, dayTwo);
	      long time2=calendar.getTimeInMillis();      
	      Date date1=new Date(time1);
	      Date date2=new Date(time2);
	      if(date2.equals(date1)){
	    	  re="两个日期相同,";
	      }      
	      else if(date2.after(date1)){
	    	  re="您输入的第二个日期大于第一个日期,";
	      }
	      else if(date2.before(date1)){
	    	  re="您输入的第二个日期小于第一个日期,";
	      }
	      long day=Math.abs(time1-time2)/(1000*60*60*24);
	      rx= re+"相差"+String.valueOf(day)+"天";
	      return rx;
		}
}
//