Java简单计算器(程序设计报告)

1、 哈尔滨哈商业大学JAVA课程设计课程名称：Java程序设计课题名称：简单计算器名：学号：二班级：08级软件工程教育2011年10月20日第 页共4页一、实验目的：使用Eclipse软件制作简单计算器，实现加减乘除等基本功能。二、实验源码：importjava.awt.*;importjava.awt.event.*;importjavax.swing.*;publicclassCalculatorpublicstaticvoidmain(Stringargs)EventQueue.invokeLater(newRunnable()publicvoidrun()CalculatorFramef

2、rame=newCalculatorFrame();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setVisible(true););classCalculatorFrameextendsJFramepublicCalculatorFrame()setTitle(Calculator);CalculatorPanalpanel=newCalculatorPanal();add(panel);pack();classCalculatorPanalextendsJPanelpublicCalculatorPanal()set

3、Layout(newBorderLayout();result=0;lastCommand=;start=true;display=newJButton(0);display.setEnabled(false);add(display,BorderLayout.NORTH);ActionListenerinsert=newInsertAction();ActionListenercommand=newCommantAction();panel=newJPanel();panel.setLayout(newGridLayout(4,4);addButton(7,insert);addButton

4、(8,insert);addButton(9,insert);addButton(/,command);addButton(4,insert);addButton(5,insert);addButton(6,insert);addButton(*,command);addButton(1,insert);addButton(2,insert);addButton(3,insert);addButton(-,command);addButton(0,insert);addButton(.,insert);addButton(=,command);addButton(+,command);add(

5、panel,BorderLayout.CENTER);privatevoidaddButton(Stringlabel,ActionListenerlistener)JButtonbutton=newJButton(label);button.addActionListener(listener);panel.add(button);privateclassInsertActionimplementsActionListenerpublicvoidactionPerformed(ActionEventevent)Stringinput=event.getActionCommand();if(s

6、tart)display.setText();start=false;display.setText(display.getText()+input);privateclassCommantActionimplementsActionListenerpublicvoidactionPerformed(ActionEventevent)Stringcommand=event.getActionCommand();if(start)第4页共4页if(command.equals(-)display.setText(command);start二false;elselastCommand=comma

7、nd;elsecalculate(Double.parseDouble(display.getText();lastCommand=command;start=true;publicvoidcalculate(doublex)if(lastCommand.equals(+)result+=x;elseif(lastCommand.equals(-)result-=x;elseif(lastCommand.equals(*)result*=x;elseif(lastCommand.equals(7)result/=x;elseif(lastCommand.equals(二)result=x;display.setText(+result);pr