中原工学院信息商务学院 经济管理系信息管理信息系统java计算器实习

import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.border.*;import java.text.DecimalFormat;public class LZ JFrame f;JMenuBar mb;JMenu m1 ,m2 ,m3 ;JMenuItem copy,cut,paste,content,index,about,t1 ,s,i;Font t;JButton bN,bS;ImageIcon img; JTextField text;/int gridx,gridy,gridwidth,gridheight,anchor,fill,ipadx,ipady;/double weightx,weighty;GridBagLayout gridbag;GridBagConstraints c;JPanel p1 ,p2 ; JLabel label;private boolean IfResult = true, flag = false;private String operation = “=“;private double result = 0 ;private Num numActionListener;private DecimalFormat df;public LZ()f=new JFrame(“计算器“);df = new DecimalFormat(“#.#“);/保留四位小数img=new ImageIcon(“图片/图片.jpg“);f.setIconImage(img.getImage();f.setResizable(false);f.setBounds(2 0 0 ,2 0 0 ,3 2 0 ,2 6 0 );Container c1 =f.getContentPane();mb=new JMenuBar(); /创建菜单棒m1 =new JMenu(“编辑(E)“);copy=new JMenuItem(“复制(C) Ctrl+C“);paste=new JMenuItem(“粘贴(P) Ctrl+V“);m2 =new JMenu(“查看(V)“);t1 =new JMenuItem(“标准型(T)“);s=new JMenuItem(“科学型(V)“);i=new JMenuItem(“数学分组(V)“);m3 =new JMenu(“帮助(H)“);content=new JMenuItem(“目录“);index=new JMenuItem(“索引“);about=new JMenuItem(“关于“);t=new Font(“sanserif“,Font.PLAIN,1 2 );addEditMenu();addViewMenu();addHelpMenu();addJMenuBar();f.setJMenuBar(mb); /显示菜单栏c=new GridBagConstraints();gridbag=new GridBagLayout();p1 =new JPanel();c1 .add(p1 );p1 .setLayout(gridbag);text=new JTextField(“0 .“,2 5 );text.setBackground(Color.white);p2 =new JPanel();text.setHorizontalAlignment(JTextField.RIGHT);text.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED);text.setEditable(false);p2 .add(text);label=new JLabel(“);c = new GridBagConstraints(0 ,1 ,1 ,1 ,0 ,0 ,GridBagConstraints.CENTER,GridBagConstraints.BOTH,new Insets(0 ,2 ,0 ,2 ),0 ,0 );gridbag.setConstraints(label,c);label.setFont(new Font(“Serif“,Font.PLAIN,1 5 );label.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED);p1 .add(label);numActionListener = new Num();/实现数字监听addJPanel(“p2 “,0 ,0 ,6 ,1 );addJButton(“Backspace“,1 ,1 ,2 ,1 ,Color.red,new Clear();addJButton(“CE“,3 ,1 ,2 ,1 ,Color.red,new Clear();addJButton(“C“,5 ,1 ,1 ,1 ,Color.red,new Clear();addJButton(“MC“,0 ,2 ,1 ,1 ,Color.red,new Clear();addJButton(“MR“,0 ,3 ,1 ,1 ,Color.red,new Clear();addJButton(“MS“,0 ,4 ,1 ,1 ,Color.red,new Clear();addJButton(“M+“,0 ,5 ,1 ,1 ,Color.red,new Clear();addJButton(“7 “,1 ,2 ,1 ,1 ,Color.blue,numActionListener);addJButton(“4 “,1 ,3 ,1 ,1 ,Color.blue,numActionListener);addJButton(“1 “,1 ,4 ,1 ,1 ,Color.blue,numActionListener);addJButton(“0 “,1 ,5 ,1 ,1 ,Color.blue,numActionListener);addJButton(“8 “,2 ,2 ,1 ,1 ,Color.blue,numActionListener);addJButton(“5 “,2 ,3 ,1 ,1 ,Color.blue,numActionListener);addJButton(“2 “,2 ,4 ,1 ,1 ,Color.blue,numActionListener);addJButton(“9 “,3 ,2 ,1 ,1 ,Color.blue,numActionListener);addJButton(“6 “,3 ,3 ,1 ,1 ,Color.blue,numActionListener);addJButton(“3 “,3 ,4 ,1 ,1 ,Color.blue,numActionListener);addJButton(“+/-“,2 ,5 ,1 ,1 ,Color.blue,numActionListener);addJButton(“.“,3 ,5 ,1 ,1 ,Color.blue,numActionListener);addJButton(“/“,4 ,2 ,1 ,1 ,Color.red,new Signs();addJButton(“*“,4 ,3 ,1 ,1 ,Color.red,new Signs();addJButton(“-“,4 ,4 ,1 ,1 ,Color.red,new Signs();addJButton(“+“,4 ,5 ,1 ,1 ,Color.red,new Signs();addJButton(“Sqrt“,5 ,2 ,1 ,1 ,Color.blue,new Signs();addJButton(“%“,5 ,3 ,1 ,1 ,Color.blue,new Signs();addJButton(“1 /x“,5 ,4 ,1 ,1 ,Color.blue,new Signs();addJButton(“=“,5 ,5 ,1 ,1 ,Color.red,new Signs();f.setVisible(true);f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);private void addEditMenu()m1 .add( copy); m1 .addSeparator();m1 .add( paste);m1 .setFont(t);private void addViewMenu()m2 .add(t1 ); m2 .addSeparator();m2 .add(s);m2 .addSeparator();m2 .add(i);m2 .setFont(t);private void addHelpMenu() /创建帮助菜单的方法m3 .add(content); m3 .add(index); m3 .addSeparator(); m3 .add(about);m3 .setFont(t);private void addJMenuBar()/将菜单加入到菜单棒上的方法mb.add(m1 ); mb.add(m2 ); mb.add(m3 );private void addJPanel(String name,int gridx,int gridy,int gridwidth,int gridheight)c.gridx=gridx;c.gridy=gridy;c.gridwidth=gridwidth;c.gridheight=gridheight;gridbag.setConstraints(p2 ,c);p1 .add(p2 );private void addJButton(String name,int gridx,int gridy,int gridwidth,int gridheight,Color yanse,ActionListener action)JButton button =new JButton(name);button.addActionListener(action);c.gridx=gridx;c.gridy=gridy;c.gridwidth=gridwidth;c.gridheight=gridheight;c.anchor=GridBagConstraints.CENTER;button.setForeground(yanse);c.insets=new Insets(3 ,2 ,3 ,2 );gridbag.setConstraints(button,c);p1 .add(button);class Num implements ActionListenerpublic void actionPerformed(ActionEvent e) String str = e.getActionCommand();if(IfResult)text.setText(str);IfResult = false;elsetext.setText(text.getText().trim() + str);if(text.getText().equals(“0 “)text.setText(“0 “);IfResult = true;flag = true;private void getResult (double x)if(operation = “+“)result += x;else if(operation = “-“)result -= x;else if(operation = “*“)result *= x;else if(operation = “/“)result /= x;else if(operation = “=“)result = x;text.setText(df.format(result);class Signs implements ActionListenerpublic void actionPerformed(ActionEvent e) /*用ActionEvent对象的getActionCommand()方法*取得与引发事件对象相关的字符串*/String str = e.getActionCommand();/* sqrt求平方根*/if(str.equals(“Sqrt“)double i = Double.parseDouble(text.getText();if(i=0 )/* String.valueOf()转换为字符串* df.format()按要求保留四位小数* Math.sqrt()求算数平方根*/text.setText(String.valueOf(df.format(Math.sqrt(i);elsetext.setText(“负数不能开平方根“);/* %求百分比*/else if(str.equals(“%“)text.setText(df.format(Double.parseDouble(text.getText() / 1 0 0 );/* 1 /x求倒数*/else if(str.equals(“1 /x“)if(Double.parseDouble(text.getText() = 0 )text.setText(“除数不能为零“);elsetext.setText(df.format(1 / Double.parseDouble(text.getText();elseif(flag)IfResult = false;if(IfResult)operation = str;elsegetResult(Double.parseDouble(text.getText();operation = str;IfResult = true;class Clear implements ActionListenerpublic void actionPerformed(ActionEvent e) /*用ActionEvent对象的getActionCommand()方法*取得与引发事件对象相关的字符