java简易计算器（四则运算、三角函数、实现优先级）

import java.awt.*; import javax.swing.*; import java.awt.event.*; public class Calculator extends JFrame { /** * */ private static final long serialVersionUID = 1L; static JFrame frame=new JFrame("计算器"); JTextField display=new JTextField("0"); Font font=new Font("Consolas",Font.BOLD,40); //设置字体样式 Font font1=new Font("Consolas",Font.BOLD,20); Image iconImage=(new ImageIcon("C:\\Study\\eclipse-workspace\\Calculator\\src\\计算器2.png")).getImage(); ImageIcon iconImage2=new ImageIcon("C:\\Study\\eclipse-workspace\\Calculator\\src\\删除.png"); actionlistener al=new actionlistener();//创建监听器action listener的对象 //计算器按键 JButton button_clear=new JButton("C"); JButton button_delete=new JButton(iconImage2); JButton button_plus=new JButton("+"); JButton button_minus=new JButton("-"); JButton button_multiply=new JButton("*"); JButton button_divide=new JButton("/"); JButton button_spot=new JButton("."); JButton button_is=new JButton("="); JButton button_sin=new JButton("sin"); JButton button_cos=new JButton("cos"); JButton button_tan=new JButton("tan"); JButton button_log=new JButton("log"); JButton button_bracket_r=new JButton("("); JButton button_bracket_l=new JButton(")"); JButton[] button=new JButton[10]; public Calculator() { super(); //设置按钮颜色字体和监听器 for (int i = 0; i < 10; i++) { button[i] = new JButton(""+i); button[i].setBackground(Color.white);//设置按钮颜色 button[i].setFont(font1); //设置按钮字体 button[i].addActionListener(al); //注册监听器 } //设置按钮颜色 button_plus.setBackground(Color.white); button_is.setBackground(Color.pink); button_minus.setBackground(Color.white); button_multiply.setBackground(Color.white); button_divide.setBackground(Color.white); button_spot.setBackground(Color.white); button_clear.setBackground(Color.white); button_delete.setBackground(Color.white); button_sin.setBackground(Color.white); button_cos.setBackground(Color.white); button_tan.setBackground(Color.white); button_log.setBackground(Color.white); button_bracket_r.setBackground(Color.white); button_bracket_l.setBackground(Color.white); //设置按键透明 button_sin.setOpaque(false); button_cos.setOpaque(false); button_log.setOpaque(false); button_tan.setOpaque(false); button_plus.setOpaque(false); button_minus.setOpaque(false); button_multiply.setOpaque(false); button_divide.setOpaque(false); button_spot.setOpaque(false); //设置按钮字体 button_plus.setFont(font1); button_is.setFont(font1); button_minus.setFont(font1); button_multiply.setFont(font1); button_divide.setFont(font1); button_spot.setFont(font1); button_clear.setFont(font1); button_delete.setFont(font1); button_sin.setFont(font1); button_cos.setFont(font1); button_tan.setFont(font1); button_log.setFont(font1); button_bracket_r.setFont(font1); button_bracket_l.setFont(font1); //计算器界面布局 frame.setIconImage(iconImage); display.setHorizontalAlignment(JTextField.RIGHT); display.setFont(font); display.setBackground(Color.white); display.setEditable(false); //设置文本框不可编辑 JPanel pan1=new JPanel(); //设置文本框布局 pan1.setLayout(new GridLayout(1,1,5,5)); pan1.setBorder(BorderFactory.createEmptyBorder(5, 5, 0, 5)); pan1.add(display); JPanel panBody=new JPanel(); //将按键加入panBody中 panBody.setLayout(new GridLayout(6,4)); panBody.add(button_clear); panBody.add(button_delete); panBody.add(button_bracket_r); panBody.add(button_bracket_l); panBody.add(button_sin); panBody.add(button_cos); panBody.add(button_tan); panBody.add(button_log); panBody.add(button[7]); panBody.add(button[8]); panBody.add(button[9]); panBody.add(button_plus); panBody.add(button[4]); panBody.add(button[5]); panBody.add(button[6]); panBody.add(button_minus); panBody.add(button[1]); panBody.add(button[2]); panBody.add(button[3]); panBody.add(button_multiply); panBody.add(button_divide); panBody.add(button[0]); panBody.add(button_spot); panBody.add(button_is); panBody.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5)); //创建框架窗口 frame.setLayout(new BorderLayout()); //布局 frame.add(pan1,BorderLayout.NORTH); frame.add(panBody,BorderLayout.CENTER); frame.setSize(480, 380); //大小 frame.setLocation(260, 150); //位置 frame.setVisible(true); frame.setResizable(false); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //注册监听器 button_plus.addActionListener(al); button_minus.addActionListener(al); button_multiply.addActionListener(al); button_divide.addActionListener(al); button_is.addActionListener(al); button_spot.addActionListener(al); button_clear.addActionListener(al); button_delete.addActionListener(al); button_sin.addActionListener(al); button_cos.addActionListener(al); button_tan.addActionListener(al); button_log.addActionListener(al); button_bracket_r.addActionListener(al); button_bracket_l.addActionListener(al); //设置热键 button[0].setMnemonic(KeyEvent.VK_0); button[1].setMnemonic(KeyEvent.VK_1); button[2].setMnemonic(KeyEvent.VK_2); button[3].setMnemonic(KeyEvent.VK_3); button[4].setMnemonic(KeyEvent.VK_4); button[5].setMnemonic(KeyEvent.VK_5); button[6].setMnemonic(KeyEvent.VK_6); button[7].setMnemonic(KeyEvent.VK_7); button[8].setMnemonic(KeyEvent.VK_8); button[9].setMnemonic(KeyEvent.VK_9); button_delete.setMnemonic(KeyEvent.VK_BACK_SPACE); button_clear.setMnemonic(KeyEvent.VK_CLEAR); button_spot.setMnemonic(KeyEvent.VK_PERIOD); button_is.setMnemonic(KeyEvent.VK_EQUALS); button_plus.setMnemonic(KeyEvent.VK_ADD); button_minus.setMnemonic(KeyEvent.VK_SUBTRACT); button_multiply.setMnemonic(KeyEvent.VK_MULTIPLY); button_divide.setMnemonic(KeyEvent.VK_SLASH); } //定义处理事件的类 public class actionlistener implements ActionListener { RPN rpn; public String pre_display=""; public void actionPerformed(ActionEvent e) { Object click1=e.getSource(); //获得组件名称 String click2=e.getActionCommand(); //获得组件标签 if(click1==button_clear) //初始化文本框 { pre_display=""; display.setText("0"); } else if(click1==button_delete) //用handleClear()方法处理delete { if(!pre_display.equals("")) display.setText(handleDelete(pre_display)); else display.setText(handleDelete(display.getText())); } else if(click2=="=") { //计算表达式 rpn=new RPN(display.getText()); rpn.ListPreExpressionToListExpression(); if(rpn.Opera_ListExpr().equals("illegal!")) display.setText("illegal!"); else if(rpn.Opera_ListExpr().equals("non-existent!")) display.setText("non-existent!"); else { double result=Double.valueOf(rpn.Opera_ListExpr()).doubleValue(); //数据类型转换 long t1=(long)result; double t2=result-t1; if(t2==0) display.setText(String.valueOf(t1)); else display.setText(String.valueOf(result)); } pre_display=""; } else { if(click2=="tan") click2="tan("; else if(click2=="sin") click2="sin("; else if(click2=="cos") click2="cos("; else if(click2=="log") click2="log("; pre_display+=click2; dis