java做租金計算器，求代碼講解

/**
 * 租金計算器
 */

package com.my.gui;

import java.awt.Container;
import java.awt.HeadlessException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.text.ParseException;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import com.my.util.CompareTime;
import com.my.util.StringUtil;

public class RentCalculatorFrame extends JFrame implements ActionListener,
KeyListener, MouseListener{

private JLabel rentPriceMonth;//月租金
private JTextField rentPriceMonthValue;

private JLabel startDate;
private JTextField startDateValue;
 
private JLabel endDate;
private JTextField endDateValue;

private JLabel rentPersonNums;
private JTextField rentPersonNumsValue;

private JLabel propertyCost;//其他費用
private JTextField propertyCostValue;

private JLabel othercost;//其他費用
private JTextField otherCostValue;

private JLabel sumCost;//總費用
private JLabel sumCostValue;

private JLabel everyCost;//平均費用
private JLabel everyCostValue;

private JButton submitButton;
private JButton resetButton;

private JPanel northPanel;
private JPanel centerPanel;
private JPanel southPanel;

private CompareTime compareTime;//日期比較
private StringUtil stringUtil;//字串工具類

private JCalendarFrame jcalendarFrame;

private int typee;//日期回應型別1:開始日期2:結束日期

public RentCalculatorFrame() {

this.setBounds(350,250,450,350);

this.setLayout(null);
this.setTitle("租金計算器");

northPanel=new JPanel();
centerPanel=new JPanel();
southPanel=new JPanel();

northPanel.setBounds(3,5,435,190);
northPanel.setBorder(BorderFactory.createTitledBorder("租金計算資訊"));

rentPriceMonth=new JLabel("月租金");
rentPriceMonthValue=https://bbs.csdn.net/topics/new JTextField(15);

rentPriceMonthValue.addKeyListener(this);

startDate=new JLabel("開始日期");
startDateValue=https://bbs.csdn.net/topics/new JTextField(8);
startDateValue.addMouseListener(this);

endDate=new JLabel("結束日期");
endDateValue=https://bbs.csdn.net/topics/new JTextField(8);
endDateValue.addMouseListener(this);

endDateValue.addKeyListener(this);

rentPersonNums=new JLabel("合租人員");
rentPersonNumsValue=https://bbs.csdn.net/topics/new JTextField(15);

rentPersonNumsValue.addKeyListener(this);

propertyCost=new JLabel("物業費用");
propertyCostValue=https://bbs.csdn.net/topics/new JTextField(15);

propertyCostValue.addKeyListener(this);

othercost=new JLabel("其他費用");
otherCostValue=https://bbs.csdn.net/topics/new JTextField(15);

otherCostValue.addKeyListener(this);

Box vBox=Box.createVerticalBox();

Box vBox1=Box.createHorizontalBox();
Box hBox1=Box.createHorizontalBox();
hBox1.add(rentPriceMonth);
hBox1.add(Box.createHorizontalStrut(10));
hBox1.add(rentPriceMonthValue);
vBox1.add(hBox1);
vBox1.add(Box.createVerticalStrut(10));

Box vBox2=Box.createVerticalBox();
Box hBox2=Box.createHorizontalBox();
hBox2.add(startDate);
hBox2.add(Box.createHorizontalStrut(10));
hBox2.add(startDateValue);
hBox2.add(Box.createHorizontalStrut(10));
hBox2.add(endDate);
hBox2.add(Box.createHorizontalStrut(10));
hBox2.add(endDateValue);

vBox2.add(hBox2);
vBox2.add(Box.createHorizontalStrut(10));

Box vBox3=Box.createVerticalBox();
Box hBox3=Box.createHorizontalBox();
hBox3.add(rentPersonNums);
hBox3.add(Box.createHorizontalStrut(10));
hBox3.add(rentPersonNumsValue);
vBox3.add(hBox3);
vBox3.add(Box.createVerticalStrut(10));

Box vBox4=Box.createVerticalBox();
Box hBox4=Box.createHorizontalBox();
hBox4.add(propertyCost);
hBox4.add(Box.createHorizontalStrut(10));
hBox4.add(propertyCostValue);
vBox4.add(hBox4);
vBox4.add(Box.createVerticalStrut(10));

Box vBox5=Box.createVerticalBox();
Box hBox5=Box.createHorizontalBox();
hBox5.add(othercost);
hBox5.add(Box.createHorizontalStrut(10));
hBox5.add(otherCostValue);
vBox5.add(hBox5);
vBox5.add(Box.createVerticalStrut(10));

vBox.add(vBox1);
vBox.add(vBox2);
vBox.add(vBox3);
vBox.add(vBox4);
vBox.add(vBox5);

northPanel.add(vBox);

centerPanel.setBounds(3,195,435,70);
centerPanel.setBorder(BorderFactory.createTitledBorder("租金計算結果"));

sumCost=new JLabel("總費用: ");
sumCostValue=https://bbs.csdn.net/topics/new JLabel("");
 
everyCost=new JLabel("平均費用");
everyCostValue=https://bbs.csdn.net/topics/new JLabel("");

Box cvBox=Box.createVerticalBox();

Box cvBox1=Box.createVerticalBox();
Box chBox1=Box.createHorizontalBox();
chBox1.add(sumCost);
chBox1.add(Box.createHorizontalStrut(15));
chBox1.add(sumCostValue);

cvBox1.add(chBox1);
cvBox1.add(Box.createVerticalStrut(5));

Box cvBox2=Box.createVerticalBox();
Box chBox2=Box.createHorizontalBox();
chBox2.add(everyCost);
chBox2.add(Box.createHorizontalStrut(20));
chBox2.add(everyCostValue);

cvBox2.add(chBox2);

cvBox.add(cvBox1);
cvBox.add(cvBox2);
centerPanel.add(cvBox);

southPanel.setBounds(3,270,435,35);
submitButton=new JButton("確定");
resetButton=new JButton("重置");

submitButton.addActionListener(this);
resetButton.addActionListener(this);

southPanel.add(submitButton);
southPanel.add(resetButton);

Container container=this.getContentPane();

container.add(northPanel);
container.add(centerPanel);
container.add(southPanel);

compareTime=new CompareTime();
jcalendarFrame=new JCalendarFrame();
jcalendarFrame.setVisible(false);

stringUtil=new StringUtil();
this.addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {
setVisible(false);
}
});

this.setVisible(true);

}

public int getTypee() {
return typee;
}

public void setTypee(int type1) {
this.typee=typee;
}

public static void main(String[] args) {
RentCalculatorFrame rentCalculator=new RentCalculatorFrame();

}

public JTextField getStartDateValue() {
return startDateValue;
}

public void setStartDateValue(JTextField startDateValue) {
this.startDateValue=https://bbs.csdn.net/topics/startDateValue;
}

public JTextField getEndDateValue() {
return endDateValue;
}

public void setEndDateValue(JTextField endDateValue) {
this.endDateValue=https://bbs.csdn.net/topics/endDateValue;
}

public void actionPerformed(ActionEvent event) {
//重置按鈕事件處理
if(event.getSource()==resetButton) {
rentPriceMonthValue.setText("");
startDateValue.setText("");
endDateValue.setText("");
rentPersonNumsValue.setText("");
propertyCostValue.setText("");
otherCostValue.setText("");

sumCostValue.setText("");
everyCostValue.setText("");

}

if(event.getSource()==submitButton) {
String rentPriceMonth=rentPriceMonthValue.getText();//月租金

String startDate=startDateValue.getText();//開始日期
String endDate=endDateValue.getText();//結束日期
String rentPersonNums=rentPersonNumsValue.getText();//合租人員
int day=0;

String propertyCost=propertyCostValue.getText();//物業費用
String otherCost=otherCostValue.getText();//其他費用

if(rentPriceMonth.equals("")||startDate.equals("")
||endDate.equals("")||rentPersonNums.equals("")) {
JOptionPane.showMessageDialog(this, "你還沒有輸入資訊呢!","租金計算出錯",
JOptionPane.ERROR_MESSAGE);
}else {

try {

//開始日期與結束日期校驗
if(compareTime.isRightSequence(startDate, endDate)) {
JOptionPane.showMessageDialog(this,"輸入結束日期在開始日期之前!",
"租金計算出錯",JOptionPane.ERROR_MESSAGE);

}else {

double rentPriceMonthDouble=Double
.parseDouble(rentPriceMonth);

double propertyCostDouble=Double
.parseDouble(propertyCost);
double otherCostDouble=Double.parseDouble(otherCost);

try {
day=compareTime
.getBetweenDays(startDate, endDate);
}catch(ParseException e) {
e.printStackTrace();
}

//計算總的租金費用
double allCost=0;

//System.out.println("day/30="+day/30);
int month=0;
try {
month=compareTime.betweenMonths(startDate, endDate);
}catch(Exception e) {
e.printStackTrace();
}

System.out.println("month="+month);
allCost=month*rentPriceMonthDouble+propertyCostDouble+otherCostDouble;

//計算合租的每一個人費用

int rentPersonNumsInt=Integer
.parseInt(rentPersonNums);

double everyCost=allCost/rentPersonNumsInt;

sumCostValue.setText(""+allCost);
everyCostValue.setText(""+Math.ceil(everyCost));

}
}catch (HeadlessException e1) {
//TODO Auto-generated catch block
e1.printStackTrace();
}catch (ParseException e1) {
//TODO Auto-generated catch block
e1.printStackTrace();
}

}

}

}

public void mouseClicked(MouseEvent event) {
if(event.getSource()==startDateValue) {
jcalendarFrame.setVisible(true);
startDateValue.setText(jcalendarFrame.getDate());
typee=1;
jcalendarFrame.setRentCalculatorFrame(this);
}

if(event.getSource()==endDateValue) {
jcalendarFrame.setVisible(true);
endDateValue.setText(jcalendarFrame.getDate());
typee=2;
jcalendarFrame.setRentCalculatorFrame(this);

}

}

public void mouseEntered(MouseEvent event) {

}

@Override
public void mouseExited(MouseEvent event) {
}

@Override
public void mousePressed(MouseEvent arg0) {
//TODO Auto-generated method stub

}

@Override
public void mouseReleased(MouseEvent event) {
if(event.getSource()==startDateValue) {
jcalendarFrame.setVisible(false

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