用java设计计算器

最新问答

• sunjia0521

  import javax.swing.*;
  import javax.swing.event.*;
  import java.awt.*;
  import java.awt.event.*;
  
  public class calculator extends JFrame implements ActionListener
  {//这里我把JFrame写成Frame，这个错误找了好久
  JFrame frame;
  
  private JButton jia=new JButton("+");
  private JButton jian=new JButton("-");
  private JButton cheng=new JButton("*");
  private JButton chu=new JButton("/");
  private JButton qiuyi=new JButton("%");
  private JButton deng=new JButton("=");
  private JButton fu=new JButton("+/-");
  private JButton dian=new JButton(".");
  private JButton kai=new JButton("sqrt");
  private JButton diao=new JButton("1/x");
  private JButton aa=new JButton("A");
  private JButton bb=new JButton("B");
  private JButton cc=new JButton("C");
  private JButton dd=new JButton("D");
  private JButton ee=new JButton("E");
  private JButton ff=new JButton("F");
  
  private TextField k1=new TextField();
  private objConversion convert = new objConversion();
  
  JMenuItem copy,paste,s,t,help,about,me;
  JRadioButton sixteen,ten,eight,two;
  JButton backspace,ce,c,num0,num1,num2,num3,num4,num5,num6,num7,num8,nu;
  Container cp;
  
  JTextField text;
  String copycontent="";
  boolean clickable=true,clear=true;
  int all=0;
  double qian;
  String fuhao;
  int jin=10,first=1;
  
  public calculator()
  {
  setTitle("计算器－杨彩");
  setSize(400,300);
  setLocation(250,200);
  text=new JTextField(25);
  // text.setEnabled(false);
  text.setText("0.");
  text.setHorizontalAlignment(JTextField.RIGHT);//从右到左
  
  JPanel cp1=new JPanel();
  JPanel cp2=new JPanel();
  JPanel cp3=new JPanel();
  
  cp=getContentPane();
  cp.add(cp1,"North");
  cp.add(cp2,"Center");
  cp.add(cp3,"South");
  
  cp1.setLayout(new GridLayout(1,6));
  cp2.setLayout(new GridLayout(2,4));
  cp3.setLayout(new GridLayout(6,6));
  
  sixteen=new JRadioButton("十六进制");
  sixteen.setVisible(false);
  ten=new JRadioButton("十进制",true);
  ten.setVisible(false);
  eight=new JRadioButton("八进制");
  eight.setVisible(false);
  two=new JRadioButton("二进制");
  two.setVisible(false);
  sixteen.addActionListener(this);
  ten.addActionListener(this);
  eight.addActionListener(this);
  two.addActionListener(this);
  ButtonGroup btg=new ButtonGroup();
  
  btg.add(sixteen);
  btg.add(ten);
  btg.add(eight);
  btg.add(two);
  
  JTextField t3=new JTextField(25);
  cp1.add(text);
  // text.setEnabled(false);
  text.setEditable(false);
  text.setBackground(new Color(255, 255, 255));
  
  cp2.add(sixteen);
  cp2.add(ten);
  cp2.add(eight);
  cp2.add(two);
  
  backspace=new JButton("Backspace");
  backspace.setForeground(new Color(255,0,0));
  backspace.addActionListener(this);
  ce=new JButton("CE");
  ce.setForeground(new Color(255,0,0));
  ce.addActionListener(this);
  c=new JButton("C");
  c.setForeground(new Color(255,0,0));
  c.addActionListener(this);
  k1.setVisible(false);
  cp2.add(k1);
  cp2.add(backspace);
  cp2.add(ce);
  cp2.add(c);
  
  num0=new JButton("0");
  num1=new JButton("1");
  num2=new JButton("2");
  num3=new JButton("3");
  num4=new JButton("4");
  num5=new JButton("5");
  num6=new JButton("6");
  num7=new JButton("7");
  num8=new JButton("8");
  nu=new JButton("9");
  
  cp3.add(num7);
  num7.addActionListener(this);
  cp3.add(num8);
  num8.addActionListener(this);
  cp3.add(nu);
  nu.addActionListener(this);
  cp3.add(chu);
  chu.setForeground(new Color(255,0,0));
  chu.addActionListener(this);
  cp3.add(kai);
  kai.addActionListener(this);
  cp3.add(num4);
  num4.addActionListener(this);
  cp3.add(num5);
  num5.addActionListener(this);
  cp3.add(num6);
  num6.addActionListener(this);
  cp3.add(cheng);
  cheng.setForeground(new Color(255,0,0));
  cheng.addActionListener(this);
  cp3.add(qiuyi);
  qiuyi.addActionListener(this);
  cp3.add(num1);
  num1.addActionListener(this);
  cp3.add(num2);
  num2.addActionListener(this);
  cp3.add(num3);
  num3.addActionListener(this);
  cp3.add(jian);
  jian.setForeground(new Color(255,0,0));
  jian.addActionListener(this);
  cp3.add(diao);
  diao.addActionListener(this);
  cp3.add(num0);
  num0.addActionListener(this);
  cp3.add(fu);
  fu.addActionListener(this);
  cp3.add(dian);
  dian.addActionListener(this);
  cp3.add(jia);
  jia.setForeground(new Color(255,0,0));
  jia.addActionListener(this);
  cp3.add(deng);
  deng.setForeground(new Color(255,0,0));
  deng.addActionListener(this);
  cp3.add(aa);
  aa.addActionListener(this);
  cp3.add(bb);
  bb.addActionListener(this);
  cp3.add(cc);
  cc.addActionListener(this);
  cp3.add(dd);
  dd.addActionListener(this);
  cp3.add(ee);
  ee.addActionListener(this);
  cp3.add(ff);
  ff.addActionListener(this);
  aa.setVisible(false);
  bb.setVisible(false);
  cc.setVisible(false);
  dd.setVisible(false);
  ee.setVisible(false);
  ff.setVisible(false);
  
  JMenuBar mainMenu = new JMenuBar();
  setJMenuBar(mainMenu);
  JMenu editMenu = new JMenu("编辑");
  JMenu viewMenu = new JMenu("查看");
  JMenu helpMenu = new JMenu("帮助");
  mainMenu.add(editMenu);
  mainMenu.add(viewMenu);
  mainMenu.add(helpMenu);
  
  copy = new JMenuItem(" 复制");
  paste = new JMenuItem(" 粘贴");
  KeyStroke copyks=KeyStroke.getKeyStroke(KeyEvent.VK_C,Event.CTRL_MASK);
  copy.setAccelerator(copyks);//设置退出菜单选项加上快捷键
  KeyStroke pasteks=KeyStroke.getKeyStroke(KeyEvent.VK_V,Event.CTRL_MASK);
  paste.setAccelerator(pasteks);//设置退出菜单选项加上快捷键
  editMenu.add(copy);
  editMenu.add(paste);
  copy.addActionListener(this);
  paste.addActionListener(this);
  
  t = new JMenuItem("●标准型");
  s = new JMenuItem(" 科学型");
  viewMenu.add(t);
  viewMenu.add(s);
  t.addActionListener(this);
  s.addActionListener(this);
  
  help = new JMenuItem(" 帮助主题");
  about = new JMenuItem(" 关于计算器");
  me = new JMenuItem(" 作者主页");
  helpMenu.add(help);
  helpMenu.add(about);
  helpMenu.add(me);
  help.addActionListener(this);
  about.addActionListener(this);
  me.addActionListener(this);
  
  addWindowListener(new WindowDestroyer());//结束窗口
  }
  
  public void actionPerformed(ActionEvent e)
  
  {//响应动作代
  
  if(first==1)
  text.setText("");
  first=0;//第一次把文本框0.清空
  
  Object temp = e.getSource();
  
  if(temp==copy)
  {
  copycontent = text.getText();
  }
  if(temp==paste)
  {
  text.setText(text.getText()+copycontent);
  
  }
  if(temp==t)
  {//标准
  
  sixteen.setVisible(false);
  ten.setVisible(false);
  eight.setVisible(false);
  two.setVisible(false);
  t.setText("●标准型");
  s.setText(" 科学型");
  aa.setVisible(false);
  bb.setVisible(false);
  cc.setVisible(false);
  dd.setVisible(false);
  ee.setVisible(false);
  ff.setVisible(false);
  }
  if(temp==s)
  {//科学
  
  sixteen.setVisible(true);
  ten.setVisible(true);
  eight.setVisible(true);
  two.setVisible(true);
  t.setText(" 标准型");
  s.setText("●科学型");
  aa.setVisible(true);
  bb.setVisible(true);
  cc.setVisible(true);
  dd.setVisible(true);
  ee.setVisible(true);
  ff.setVisible(true);
  aa.setEnabled(false);
  bb.setEnabled(false);
  cc.setEnabled(false);
  dd.setEnabled(false);
  ee.setEnabled(false);
  ff.setEnabled(false);
  
  }
  if(temp==help)
  { //打开系统帮助文件 要查
  try
  {
  String filePath = "C:/WINDOWS/Help/calc.chm";
  Runtime.getRuntime().exec("cmd.exe /c "+filePath);
  
  }
  catch(Exception eeee)
  {
  System.out.println("打开系统的计算器出错");
  }
  }
  if(temp==about)
  {
  JOptionPane.showMessageDialog(frame," Java计算器 杨彩 sina.com.cn/m/yangcai","关于计算器",JOptionPane.INFORMATION_MESSAGE); ;
  }
  if(temp==me)
  {
  try
  {
  Process p = Runtime.getRuntime().exec("explorer sina.com.cn/m/yangcai");
  }
  catch(Exception eeee)
  {
  System.out.println("打开指定网页出错");
  }
  }
  
  try
  {
  if(temp==sixteen)
  {
  String hex=text.getText();
  int inthex=Integer.parseInt(hex,jin);//先把数变为10进制
  text.setText(convert.decHex(inthex)) ;
  jin=16;
  aa.setEnabled(true);
  bb.setEnabled(true);
  cc.setEnabled(true);
  dd.setEnabled(true);
  ee.setEnabled(true);
  ff.setEnabled(true);
  num2.setEnabled(true);
  num3.setEnabled(true);
  num4.setEnabled(true);
  num5.setEnabled(true);
  num6.setEnabled(true);
  num7.setEnabled(true);
  num8.setEnabled(true);
  nu.setEnabled(true);
  
  }
  if(temp==eight)
  {
  String oct =text.getText();
  int intoct=Integer.parseInt(oct,jin);
  text.setText(convert.decOct(intoct)) ;
  jin=8;
  
  aa.setEnabled(false);
  bb.setEnabled(false);
  cc.setEnabled(false);
  dd.setEnabled(false);
  ee.setEnabled(false);
  ff.setEnabled(false);
  num2.setEnabled(true);
  num3.setEnabled(true);
  num4.setEnabled(true);
  num5.setEnabled(true);
  num6.setEnabled(true);
  num7.setEnabled(true);
  num8.setEnabled(false);
  nu.setEnabled(false);
  }
  if(temp==two)
  {
  String bin=text.getText();
  int intbin=Integer.parseInt(bin,jin);
  text.setText(convert.decBin(intbin));
  jin=2;
  
  aa.setEnabled(false);
  bb.setEnabled(false);
  cc.setEnabled(false);
  dd.setEnabled(false);
  ee.setEnabled(false);
  ff.setEnabled(false);
  num2.setEnabled(false);
  num3.setEnabled(false);
  num4.setEnabled(false);
  num5.setEnabled(false);
  num6.setEnabled(false);
  num7.setEnabled(false);
  num8.setEnabled(false);
  nu.setEnabled(false);
  }
  if(temp==ten)
  {
  String dec=text.getText();
  int intdec=Integer.parseInt(dec,jin);
  // text.setText(convert.decDec(intdec)); //本句会把123变成321
  text.setText(intdec+"");
  jin=10;
  aa.setEnabled(false);
  bb.setEnabled(false);
  cc.setEnabled(false);
  dd.setEnabled(false);
  ee.setEnabled(false);
  ff.setEnabled(false);
  num2.setEnabled(true);
  num3.setEnabled(true);
  num4.setEnabled(true);
  num5.setEnabled(true);
  num6.setEnabled(true);
  num7.setEnabled(true);
  num8.setEnabled(true);
  nu.setEnabled(true);
  }
  }
  catch(Exception ee)
  {
  System.out.println("转换出错,可能你没有输入任何字符");
  text.setText("转换出错");
  clear=false;
  }
  
  if(temp==backspace)
  {//退格
  String s = text.getText();
  text.setText("");
  for (int i = 0; i < s.length() - 1; i++)
  {
  char a = s.charAt(i);
  text.setText(text.getText() + a);
  }
  }
  
  if (temp==ce)
  {
  text.setText("0.");
  clear=true;
  first=1;
  }
  if (temp==c)
  {
  text.setText("0."); ;
  clear=true;
  first=1;
  }
  
  if(temp==num0)
  {
  if(clear==false)//判断是否点击了符号位
  text.setText("");
  text.setText(text.getText()+"0");
  }
  
  if(temp==num1)
  {
  if(clear==false)
  text.setText("");
  text.setText(text.getText()+"1");
  clear=true;//第二次不在清空（前二句）
  }
  
  if(temp==num2)
  {
  if(clear==false)
  text.setText("");
  text.setText(text.getText()+"2");
  clear=true;
  }
  
  if(temp==num3)
  {
  if(clear==false)
  text.setText("");
  text.setText(text.getText()+"3");
  clear=true;
  }
  
  if(temp==num4)
  {
  if(clear==false)
  text.setText("");
  text.setText(text.getText()+"4");
  clear=true;
  }
  
  if(temp==num5)
  {
  if(clear==false)
  text.setText("");
  text.setText(text.getText()+"5");
  clear=true;
  }
  
  if(temp==num6)
  {
  if(clear==false)
  text.setText("");
  text.setText(text.getText()+"6");
  clear=true;
  }
  if(temp==num7)
  {
  if(clear==false)
  text.setText("");
  text.setText(text.getText()+"7");
  clear=true;
  }
  
  if(temp==num8)
  {
  if(clear==false)
  text.setText("");
  text.setText(text.getText()+"8");
  clear=true;
  }
  
  if(temp==nu)
  {
  if(clear==false)
  text.setText("");
  text.setText(text.getText()+"9");
  clear=true;
  }
  if(temp==aa)
  {
  text.setText(text.getText()+"A");
  }
  if(temp==bb)
  {
  text.setText(text.getText()+"B");
  }
  
  if(temp==cc)
  {
  text.setText(text.getText()+"C");
  }
  
  if(temp==dd)
  {
  text.setText(text.getText()+"D");
  }
  
  if(temp==ee)
  {
  text.setText(text.getText()+"E");
  }
  if(temp==ff)
  {
  text.setText(text.getText()+"F");
  }
  if(temp==dian)
  {
  clickable=true;
  for (int i = 0; i < text.getText().length(); i++)
  if ('.' == text.getText().charAt(i))
  {
  clickable=false;
  break;
  } //第一层判断是否里面含有小数点;
  
  if(clickable==true)//第二坛判断
  text.setText(text.getText()+".");
  
  }
  
  try
  {
  if(temp==jia)
  {//加法
  qian=Double.parseDouble(text.getText());
  fuhao="+";
  clear=false;
  }
  if(temp==jian)
  {
  qian=Double.parseDouble(text.getText());
  fuhao="-";
  clear=false;
  ;
  
  }
  if(temp==cheng)
  {
  qian=Double.parseDouble(text.getText());
  fuhao="*";
  clear=false;
  
  }
  if(temp==chu)
  {
  qian=Double.parseDouble(text.getText());
  fuhao="/";
  clear=false;
  
  }
  if(temp==deng)
  {
  double ss=Double.parseDouble(text.getText());
  text.setText("");
  if(fuhao=="+")
  text.setText(qian+ss+"");
  if(fuhao=="-")
  text.setText(qian-ss+"");
  if(fuhao=="*")
  text.setText(qian*ss+"");
  if(fuhao=="/")
  text.setText(qian/ss+"");
  clear=false;//要清空前一次的
  ;
  
  }
  
  if(temp==kai)
  {
  String s = text.getText();
  if (s.charAt(0) == '-')
  {
  text.setText("负数不能开根号");
  }
  else
  text.setText(Double.toString(java.lang.Math.sqrt(Double.parseDouble(text.getText()))));
  clear=false;
  }
  
  if(temp==diao)
  {
  
  if (text.getText().charAt(0) == '0'&&text.getText().length() == 1)
  {
  text.setText("除数不能为零");
  }
  else
  {
  boolean isDec = true;
  int i, j, k;
  String s = Double.toString(1 / Double.parseDouble(text.getText()));
  for (i = 0; i < s.length(); i++)
  if (s.charAt(i) == '.')
  break;
  for (j = i + 1; j < s.length(); j++)
  if (s.charAt(j) != '0')
  {
  isDec = false;
  break;
  }
  if (isDec == true)
  {
  String stemp = "";
  for (k = 0; k < i; k++)
  stemp += s.charAt(k);
  text.setText(stemp);
  }
  else
  text.setText(s);
  }
  
  clear=false;
  }
  if(temp==qiuyi)
  {
  text.setText("0");
  clear=false;
  }
  if (temp == fu)
  { //导师，此方法参考书中例子
  boolean isNumber = true;
  String s = text.getText();
  for (int i = 0; i < s.length(); i++)
  if (! (s.charAt(i) >= '0' && s.charAt(i) <= '9' || s.charAt(i) == '.' ||
  s.charAt(i) == '-'))
  {
  isNumber = false;
  break;
  }
  if (isNumber == true)
  {
  //如果当前字符串首字母有'-'号,代表现在是个负数,再按下时,则将首符号去掉
  if (s.charAt(0) == '-')
  {
  text.setText("");
  for (int i = 1; i < s.length(); i++)
  {
  char a = s.charAt(i);
  text.setText(text.getText() + a);
  }
  }
  //如果当前字符串第一个字符不是符号，则一个符号在首字母处
  else
  text.setText('-' + s);
  }
  }
  
  }
  catch(Exception eee)
  {
  System.out.println("运算时,首先输入数字或字符");
  text.setText("运算出错");
  clear=false;
  }
  
  }
  
  class WindowDestroyer extends WindowAdapter
  {//退出窗口动作
  public void windowClosing(WindowEvent e)
  {
  System.exit(0);
  }
  }
  
  class objConversion
  {//导师,本进制类参考了CSMD类转换例子
  
  public void objConversion ()
  {
  }
  
  public String decDec (int decNum)
  {//10
  
  String strDecNum = Integer.toString(decNum);
  
  for (int i = strDecNum.length(); i < 3; i++)
  {
  strDecNum = "0" + strDecNum;
  }
  
  // return strDecNum;
  return invert (strDecNum, 5);
  
  }
  
  public String decHex (int decNum)
  {//10 to 16
  
  String strHexNum = "";
  int currentNum = 0;
  
  while (decNum != 0)
  {
  
  if (decNum > 15)
  {
  
  currentNum = decNum % 16;
  decNum /= 16;
  
  }
  else
  {
  
  currentNum = decNum;
  decNum = 0;
  
  }
  
  switch (currentNum)
  {
  
  case 15: strHexNum += "F";
  break;
  case 14: strHexNum += "E";
  break;
  case 13: strHexNum += "D";
  break;
  case 12: strHexNum += "C";
  break;
  case 11: strHexNum += "B";
  break;
  case 10: strHexNum += "A";
  break;
  default: strHexNum += Integer.toString(currentNum);
  break;
  
  }
  
  }
  
  return invert (strHexNum, 2);
  
  }
  
  public String decOct (int decNum)
  {//10 to 8
  
  String strOctNum = "";
  
  while (decNum != 0)
  {
  
  if (decNum > 7)
  {
  
  strOctNum += Integer.toString(decNum % 8);
  decNum /= 8;
  
  }
  else
  {
  
  strOctNum += Integer.toString(decNum);
  decNum = 0;
  
  }
  
  }
  
  return invert (strOctNum, 3);
  
  }
  
  public String decBin (int decNum)
  {//10 to 2
  
  String strBinNum = "";
  
  while (decNum != 0)
  {
  
  if (decNum > 1)
  {
  
  strBinNum += Integer.toString(decNum % 2);
  decNum /= 2;
  
  }
  else
  {
  
  strBinNum += Integer.toString(decNum);
  decNum = 0;
  
  }
  
  }
  
  return invert (strBinNum, 8);
  
  }
  
  private String invert (String strNum, int minLength) //转换长度
  {
  
  String answer = "";
  int length = strNum.length();
  
  if (length < minLength)
  {
  
  for (int padding = (minLength - length); padding > 0; padding--)
  {
  answer += "0";
  }
  
  }
  
  for (int i = length; i > 0; i--)
  {
  answer += strNum.charAt (i - 1);
  }
  
  return answer;
  
  }
  
  }
  
  public static void main(String arg[])//产生窗口
  {
  calculator win = new calculator();
  win.setVisible(true);
  }
  
  }

  浏览 172赞 66时间 2022-02-17