packageFactoryMethodPattern;/*创建人：czc

创建时间：2019/12/16

创建用途：简单工厂模式实现计算器--主界面*/

import javax.swing.*;importjavax.swing.border.BevelBorder;import java.awt.*;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;public classMain {private staticOperation operation;private JFrame frame=new JFrame("简单工厂模式实现计算器");private JPanel panel_show=new JPanel(); //显示面板

private JMenuBar menuBar=newJMenuBar();private JMenu menu1=new JMenu("帮助");private JLabel label_hint=new JLabel(); //提示信息标签

private JLabel label_input=new JLabel(); //输入信息标签

private JLabel label_result=new JLabel(); //输出结果标签

private JPanel panel_button=new JPanel(); //按钮面板

private final String[] str={"AC","←","²","÷","7","8","9","×","4","5","6","-","1","2","3","+","%","0",".","="};private JButton[] buttons=newJButton[str.length];private static double numberA=0;private static double numberB=0;private static double result=0;private boolean flag=true; //记录是否是第一次计算

private boolean resultIsChange=false; //判断结果框是否需要更改

private boolean turn=true; //判断当前需要赋值给numberA还是numberB，true为A,false为B

private static boolean hasOperation=true; //判断之前是否已经存在操作符

private static int index=0; //记录最后一个操作符位置//界面初始化

private voidinitJFrame(){

Container container=frame.getContentPane();

frame.setSize(600,500);//设置窗口居中显示

frame.setLocationRelativeTo(null);//设置菜单栏

menu1.setFont(new Font("",Font.BOLD,20));

menuBar.add(menu1);

frame.setJMenuBar(menuBar);//设置提示信息标签

label_hint.setText(" ");

label_hint.setHorizontalAlignment(JLabel.RIGHT);

label_hint.setFont(new Font("宋体",Font.BOLD,30));

label_hint.setForeground(Color.RED);//设置输入标签

label_input.setText(" ");

label_input.setHorizontalAlignment(JLabel.RIGHT);

label_input.setFont(new Font("宋体",Font.BOLD,30));

label_input.setForeground(Color.BLACK);//设置结果标签

label_result.setText("0");

label_result.setHorizontalAlignment(JLabel.RIGHT);

label_result.setFont(new Font("宋体",Font.BOLD,35));

label_result.setForeground(Color.BLUE);

panel_show.setLayout(newBorderLayout());

panel_show.add(label_hint,BorderLayout.NORTH);

panel_show.add(label_input,BorderLayout.CENTER);

panel_show.add(label_result,BorderLayout.SOUTH);//创建具有指定类型、高亮显示和阴影颜色的斜面边框。

panel_show.setBorder(new BevelBorder(BevelBorder.RAISED, new Color(160, 170, 180), null, SystemColor.scrollbar, null));

panel_button.setLayout(new GridLayout(5, 4, 8, 8));//按键设置为网格布局5行5列间距为8//创建具有指定类型、高亮显示和阴影颜色的斜面边框。凸出斜面类型。为滚动条提供的背景色。

panel_button.setBorder(new BevelBorder(BevelBorder.RAISED, new Color(160, 170, 180), null, SystemColor.scrollbar, null));//添加按钮

for(int i=0;i

buttons[i]=newJButton(str[i]);

buttons[i].setFont(new Font("宋体",Font.BOLD,30));

buttons[i].addActionListener(new MyActionListener()); //为每个按钮添加事件监听器

panel_button.add(buttons[i]);//把每个按钮分别添加到面板上

}//把面板添加进窗体框架里

frame.add(panel_show,BorderLayout.NORTH);

frame.add(panel_button,BorderLayout.CENTER);

frame.setVisible(true);

frame.setDefaultCloseOperation(frame.DISPOSE_ON_CLOSE);

}public static voidmain(String[] args){newMain().initJFrame();

}private class MyActionListener implementsActionListener{

@Overridepublic voidactionPerformed(ActionEvent actionEvent) {

String str=actionEvent.getActionCommand(); //得到触发事件相关的命令字符串

switch(str){case "AC"://清屏操作

clear();break;case "←"://回退操作修改输入标签

String s=label_input.getText();if(s.length()>1){

label_input.setText(s.substring(0,s.length()-1));

}else{

numberA=0;

numberB=0;

label_input.setText(" ");

label_result.setText("0");

}//回退操作修改操作符

System.out.println(s.length());

System.out.println(index);if(s.length()==2){

label_result.setText("0");break;

}if(s.length()==(index+2)){

numberB=0;

label_result.setText(""+numberA);break;

}if(s.length()==(index+1)){

index=0;

operation=null;break;

}//回退操作修改numberA、B以及结果标签

if(index==0){

numberA=numberA/10;

label_result.setText(""+numberA);

}else{

numberB=numberB/10;

label_result.setText(""+numberB);

}break;case "²"://平方操作

labelInputAppend(str);double d=Double.parseDouble(label_result.getText());

label_result.setText(""+d*d);if(turn){

numberA=Double.parseDouble(label_result.getText());

}else{

numberB=Double.parseDouble(label_result.getText());

}break;case "÷"://除法操作

common(str);

operation=OperatorFactory.createOperate("÷");

resultIsChange=false;break;case "×":

common(str);

operation=OperatorFactory.createOperate("×");

resultIsChange=false;break;case "-":

common(str);

operation=OperatorFactory.createOperate("-");

resultIsChange=false;break;case "+":

common(str);

operation=OperatorFactory.createOperate("+");

resultIsChange=false;break;case "%":

common(str);

operation=OperatorFactory.createOperate("%");

resultIsChange=false;break;case ".":

labelInputAppend(str);

lableResultAppend(str);break;case "="://进行计算

turn=true;//如果没有按下操作符就按下=

if(operation==null){

label_result.setText(""+numberA);break;

}//当进行除法和模操作时，判断numberB是否为0

Object obj=operation.getClass();

System.out.println(obj);if(obj.equals(OperationDiv.class)||obj.equals(OperationMod.class)){if(numberB==0.0){

label_hint.setText("除数不能为0！");break;

}

}

operation.setNumberA(numberA);

operation.setNumberB(numberB);try{

result=operation.getResult();

}catch(Exception e) {

label_hint.setText("抱歉，程序出现错误！");

result=0;

e.printStackTrace();

}

label_result.setText(""+result);

hasOperation=true;

flag=false; //非第一次计算

break;default://所有数字按键进行相同操作

labelInputAppend(str);if(!resultIsChange){

label_result.setText(str);

}else{

lableResultAppend(str);

}

resultIsChange=true;if(turn){

numberA=Double.parseDouble(label_result.getText());

}else{

numberB=Double.parseDouble(label_result.getText());

}break;

}

}

}//清屏

private voidclear(){

label_hint.setText(" ");

label_input.setText(" ");

label_result.setText("0");

numberA=0;

numberB=0;

result=0;

turn=true;

Main.this.flag=true;

hasOperation=true;

resultIsChange=false;

}//在输入框中添加字符串

private voidlabelInputAppend(String s){

label_input.setText(label_input.getText()+s);

}//在结果框之添加字符串

private voidlableResultAppend(String s){

label_result.setText(label_result.getText()+s);

}//包装相同操作

private voidcommon(String str){

turn=false;if(flag){if(hasOperation){

labelInputAppend(str);

index=label_input.getText().length()-1;

hasOperation=false;

}else{

label_input.setText(label_input.getText().substring(0,label_input.getText().length()-1)+str);

}

}else{

numberA=Double.parseDouble(label_result.getText());if(hasOperation){

labelInputAppend(str);

index=label_input.getText().length()-1;

hasOperation=false;

}else{

label_input.setText(label_input.getText().substring(0,label_input.getText().length()-1)+str);

}

}

}

}