java课程设计-计算器

import javax.swing.*; import java.awt.*; import java.awt.event.*; public class Computer extends JFrame implements ActionListener { private double sum1,sum2; private char fuhao; private JMenu bianji=new JMenu("编辑"); //设计菜单 private JMenu help=new JMenu("帮助"); private JMenuItem copy=new JMenuItem("复制"); private JMenuItem zt=new JMenuItem("粘贴"); private JMenuItem gy=new JMenuItem("关于"); private JTextField text=new JTextField(32); //结果区域 JPanel pan2=new JPanel();JPanel pan3=new JPanel(); //设计面板 JPanel pan4=new JPanel();JPanel pan5=new JPanel(); JButton nul=new JButton();JButton back=new JButton("Back");//第一行按钮 JButton ce=new JButton("CE");JButton c=new JButton("C"); JButton num1=new JButton("1");JButton num2=new JButton("2");//数据按钮 JButton num3=new JButton("3");JButton num4=new JButton("4"); JButton num5=new JButton("5");JButton num6=new JButton("6"); JButton num7=new JButton("7");JButton num8=new JButton("8"); JButton num9=new JButton("9");JButton num0=new JButton("0"); JButton num10=new JButton("+/-");JButton num11=new JButton("="); JButton fh1=new JButton("+");JButton fh2=new JButton("-");//算数符号按钮 JButton fh3=new JButton("*");JButton fh4=new JButton("/"); JButton sqr=new JButton("sqr");JButton qy=new JButton("%"); JButton ch=new JButton("1/x");JButton poin=new JButton("."); JButton mc=new JButton("MC");JButton mr=new JButton("MR"); JButton ms=new JButton("MS");JButton mj=new JButton("M+"); Computer() { setTitle("计算器"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setResizable(false); JPanel pan1=new JPanel(); text.setHorizontalAlignment(JTextField.RIGHT); bianji.setForeground(Color.white); help.setForeground(Color.white); ms.setForeground(Color.red);mr.setForeground(Color.red); mc.setForeground(Color.red);mj.setForeground(Color.red); back.setForeground(Color.red);ce.setForeground(Color.red); c.setForeground(Color.red); fh1.setForeground(Color.red); fh2.setForeground(Color.red); fh3.setForeground(Color.red); fh4.setForeground(Color.red); num11.setForeground(Color.red); pan1.setBackground(Color.darkGray); //设置背景颜色 pan2.setBackground(Color.darkGray); pan3.setBackground(Color.darkGray); pan4.setBackground(Color.darkGray); pan5.setBackground(Color.darkGray); pan2.setLayout(new GridLayout(4,5,5,5)); //布局各个面板 pan3.setLayout(new GridLayout(1,4,35,5)); pan4.setLayout(new BorderLayout(10,5)); pan5.setLayout(new GridLayout(4,1,5,20)); //添加事件监听器 back.addActionListener(this);ce.addActionListener(this); c.addActionListener(this); fh1.addActionListener(this);fh2.addActionListener(this); fh3.addActionListener(this);fh4.addActionListener(this); num0.addActionListener(this);num1.addActionListener(this); num2.addActionListener(this);num3.addActionListener(this); num4.addActionListener(this);num5.addActionListener(this); num6.addActionListener(this);num7.addActionListener(this); num8.addActionListener(this);num9.addActionListener(this); num10.addActionListener(this);num11.addActionListener(this); bianji.add(copy); //菜单添加 bianji.add(zt); help.add(gy); pan3.add(nul);pan3.add(back);pan3.add(ce);pan3.add(c); //向各个面板添加按钮 pan2.add(num7);pan2.add(num8);pan2.add(num9);pan2.add(fh1);pan2.add (sqr);pan2.add(num4); pan2.add(num5);pan2.add(num6);pan2.add(fh2);pan2.add(qy);pan2.add (num1);pan2.add(num2); pan2.add(num3);pan2.add(fh3);pan2.add(ch);pan2.add(num0);pan2.add (num10);pan2.add(poin); pan2.add(fh4);pan2.add(num11); pan4.add(pan5,BorderLayout.WEST); pan4.add(pan2,BorderLayout.EAST); pan5.add(ms); pan5.add(mc); pan5.add(mr); pan5.add(mj); pan1.add(bianji);pan1.add(help); text.setEditable(false); pan1.add(text); pan1.add(pan3); pan1.add(pan4); setContentPane(pan1); } public static void main(String[] args) { JFrame frame=new Computer(); // frame.isResizable(false); frame.setSize(365,300); frame.setVisible(true); } public void actionPerformed(ActionEvent e) { Object ob=e.getSource(); try { if(ob==num1) text.setText(text.getText()+1); if(ob==num2) text.setText(text.getText()+2); if(ob==num3) text.setText(text.getText()+3); if(ob==num4) text.setText(text.getText()+4); if(ob==num5) text.setText(text.getText()+5); if(ob==num6) text.setText(text.getText()+6); if(ob==num7) text.setText(text.getText()+7); if(ob==num8) text.setText(text.getText()+8); if(ob==num9) text.setText(text.getText()+9); if(ob==num0) text.setText(text.getText()+0); if(ob==fh1) sum1=Double.parseDouble(text.getText()); if(ob==fh2) sum1=Double.parseDouble(text.getText()); if(ob==fh3) sum1=Double.parseDouble(text.getText()); if(ob==fh4) sum1=Double.parseDouble(text.getText()); if(ob==back) { String str=text.getText(); if(str.length()>1) { str=str.substring(0,str.length()-1); text.setText(str); } if(str.length()==1) { str="0"; text.setText(str); } } if(ob==fh1) {sum1=Double.parseDouble(text.getText()); text.setText(""); fuhao='+';} else if(ob==fh2) {sum1=Double.parseDouble(text.getText()); text.setText(""); fuhao='-';} else if(ob==fh3) {sum1=Double.parseDouble(text.getText()); text.setText(""); fuhao='*';} else if(ob==fh4) {sum1=Double.parseDouble(text.getText()); text.setText(""); fuhao='/';} if(ob==num11) { sum2=Double.parseDouble(text.getText()); switch(fuhao) { case '+' : text.setText(String.valueOf((sum1+sum2))); break; case '-' : text.setText(String.valueOf((sum1-sum2))); break; case '*' : text.setText(String.valueOf((sum1*sum2))); break; case '/' : text.setText(String.valueOf((sum1/sum2))); break; } } if(ob==c) text.setText(""); } catch (Exception ex) { } } }