实验三java图形用户界面编程.doc

Java实验三图形用户界面编程一实验目的1.学习编写带有图形化界面的程序。2.掌握JFrame、JLabel、JTextField、JButton和JPanel等组件的使用方法。3.掌握事件处理的方法。4.掌握常用的布局管理器。2 实验内容 2.1 程序要求1设计一个简单的图形化界面计算器程序，实现两个实数的四则运算。2创建2个文本字段，用于输入操作数；创建1个不可编辑的文本字段，用于输出运算结果；创建4个按钮，用于输入运算符。3对按钮出发动作进行处理。4将前面创建的组建添加到框架中，合理布局，给文本字段加上说明。 22.2 设计工作 界面设计：在panel上添加四个按钮，分别为+、-、*、/、=，再添加两个文本框分别输入和输出算式和结果。监听器监听按钮动作和回车操作。三思考题1AWT和Swing布局管理器和事件处理机制是什么样的？答：常用的布局管理器有：流布局，网格布局，卡片布局，边界布局，网格包布局。处理事件的机制：主要包含事件源，监听器，事件三部分。事件源一旦触发事件，系统便将事件的相关信息封装成对应类型的事件对象，并将事件对象发送给相应的监听器对象，监听器对象便能访问事件对象，对事件对象中的信息作出响应，执行相应的事件处理方法。四程序代码import java.awt.*;import java.awt.event.*;import javax.swing.*; /导入类包class simplecalculator static String point=new String();static String Amal=new String();static String ONE=new String();static String TWO=new String();static String THREE=new String();static String FOUR=new String();static String FIVE=new String();static String SIX=new String();static String SEVEN=new String();static String EIGHT=new String();static String NINE=new String();static String ZERO=new String();static String ResultState=new String();static Double QF;static JButton zero=new JButton(0);static JButton one=new JButton(1);static JButton two=new JButton(2);static JButton three=new JButton(3);static JButton four=new JButton(4);static JButton five=new JButton(5);static JButton six=new JButton(6);static JButton seven=new JButton(7);static JButton eight=new JButton(8);static JButton nine=new JButton(9);static JButton add=new JButton(+);static JButton sub=new JButton(-);static JButton mul=new JButton(*);static JButton div=new JButton(/);static JButton QuFan=new JButton(+/-);static JButton Dian=new JButton(.);static JButton equal=new JButton(=);static JButton clear=new JButton(C);static JButton BaiFen=new JButton(%);static JButton FenZhiYi=new JButton(1/x);static int i=0;static Double addNumber;static Double subNumber;static Double mulNumber;static Double divNumber;static Double equalNumber;static Double temp;static JTextArea result=new JTextArea(1,20);public static void main(String args)JFrame frame=new JFrame(计算器);result.setEditable(false);result.setText();ResultState=窗口空;JPanel ForResult=new JPanel();JPanel ForButton7_clear=new JPanel();JPanel ForButton4_mul=new JPanel();JPanel ForButton1_sub=new JPanel();JPanel ForButton0_equal=new JPanel();FlowLayout FLO=new FlowLayout();ForResult.add(result);ForButton7_clear.setLayout(FLO);ForButton7_clear.add(seven);ForButton7_clear.add(eight);ForButton7_clear.add(nine);ForButton7_clear.add(div);ForButton7_clear.add(clear);ForButton4_mul.setLayout(FLO);ForButton4_mul.add(four);ForButton4_mul.add(five);ForButton4_mul.add(six);ForButton4_mul.add(mul);ForButton4_mul.add(BaiFen);ForButton1_sub.setLayout(FLO);ForButton1_sub.add(one);ForButton1_sub.add(two);ForButton1_sub.add(three);ForButton1_sub.add(sub);ForButton1_sub.add(FenZhiYi);ForButton0_equal.setLayout(FLO);ForButton0_equal.add(zero);ForButton0_equal.add(QuFan);ForButton0_equal.add(Dian);ForButton0_equal.add(add);ForButton0_equal.add(equal);frame.getContentPane().setLayout(FLO);frame.getContentPane().add(ForResult);frame.getContentPane().add(ForButton7_clear);frame.getContentPane().add(ForButton4_mul);frame.getContentPane().add(ForButton1_sub);frame.getContentPane().add(ForButton0_equal);frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);frame.setBounds(250,250,245,245);frame.setResizable(false);frame.setVisible(true);clear.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)result.setText();ZERO=;ONE=;TWO=;THREE=;FOUR=;FIVE=;SIX=;SEVEN=;EIGHT=;NINE=;ResultState=窗口空;point=;i=0;);zero.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)ZERO=已经点击;ResultState=窗口不为空;if(ONE=已经点击|TWO=已经点击|THREE=已经点击|FOUR=已经点击|FIVE=已经点击|SIX=已经点击|SEVEN=已经点击|EIGHT=已经点击|NINE=已经点击)result.append(0);if(ResultState=窗口空)result.setText(0););one.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)ONE=已经点击;ResultState=窗口不为空;if(point=已经点击|ZERO!=已经点击|ONE=已经点击|TWO=已经点击|THREE=已经点击|FIVE=已经点击|SIX=已经点击|SEVEN=已经点击|EIGHT=已经点击|NINE=已经点击&result.getText()!=0)result.append(1);if(ResultState=窗口空)result.setText(1););two.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)TWO=已经点击;ResultState=窗口不为空;if(point=已经点击|ZERO!=已经点击|ONE=已经点击|TWO=已经点击|THREE=已经点击|FIVE=已经点击|SIX=已经点击|SEVEN=已经点击|EIGHT=已经点击|NINE=已经点击&result.getText()!=0)result.append(2);if(ResultState=窗口空)result.setText(2););three.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)THREE=已经点击;ResultState=窗口不为空;if(point=已经点击|ZERO!=已经点击|ONE=已经点击|TWO=已经点击|THREE=已经点击|FIVE=已经点击|SIX=已经点击|SEVEN=已经点击|EIGHT=已经点击|NINE=已经点击&result.getText()!=0)result.append(3);if(ResultState=窗口空)result.setText(3); );four.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)FOUR=已经点击;ResultState=窗口不为空;if(point=已经点击|ZERO!=已经点击|ONE=已经点击|TWO=已经点击|THREE=已经点击|FIVE=已经点击|SIX=已经点击|SEVEN=已经点击|EIGHT=已经点击|NINE=已经点击&result.getText()!=0)result.append(4);if(ResultState=窗口空)result.setText(4););five.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)FIVE=已经点击;ResultState=窗口不为空;if(point=已经点击|ZERO!=已经点击|ONE=已经点击|TWO=已经点击|THREE=已经点击|FIVE=已经点击|SIX=已经点击|SEVEN=已经点击|EIGHT=已经点击|NINE=已经点击&result.getText()!=0)result.append(5);if(ResultState=窗口空)result.setText(6););six.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)SIX=已经点击;ResultState=窗口不为空;if(point=已经点击|ZERO!=已经点击|ONE=已经点击|TWO=已经点击|THREE=已经点击|FIVE=已经点击|SIX=已经点击|SEVEN=已经点击|EIGHT=已经点击|NINE=已经点击&result.getText()!=0)result.append(6);if(ResultState=窗口空)result.setText(6););seven.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)SEVEN=已经点击;ResultState=窗口不为空;if(point=已经点击|ZERO!=已经点击|ONE=已经点击|TWO=已经点击|THREE=已经点击|FIVE=已经点击|SIX=已经点击|SEVEN=已经点击|EIGHT=已经点击|NINE=已经点击&result.getText()!=0)result.append(7);if(ResultState=窗口空)result.setText(7););eight.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)EIGHT=已经点击;ResultState=窗口不为空;if(point=已经点击|ZERO!=已经点击|ONE=已经点击|TWO=已经点击|THREE=已经点击|FIVE=已经点击|SIX=已经点击|SEVEN=已经点击|EIGHT=已经点击|NINE=已经点击&result.getText()!=0)result.append(8);if(ResultState=窗口空)result.setText(8););nine.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)NINE=已经点击;ResultState=窗口不为空;if(point=已经点击|ZERO!=已经点击|ONE=已经点击|TWO=已经点击|THREE=已经点击|FIVE=已经点击|SIX=已经点击|SEVEN=已经点击|EIGHT=已经点击|NINE=已经点击&result.getText()!=0)result.append(9);if(ResultState=窗口空)result.setText(9););Dian.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)point=已经点击;i=i+1;if(ResultState=窗口不为空&i=1)result.append(.););add.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)Amal=已经选择加号;addNumber=Double.valueOf(result.getText().doubleValue();result.setText();i=0;);sub.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)Amal=已经选择减号;subNumber=Double.valueOf(result.getText().doubleValue();result.setText();i=0;);mul.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)Amal=已经选择乘号;mulNumber=Double.valueOf(result.getText().doubleValue();result.setText();i=0;);div.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)Amal=已经选择除号;divNumber=Double.valueOf(result.getText().doubleValue();result.setText();i=0;);QuFan.addActionListener( new ActionListener()public void actionPerformed(ActionEvent e)QF=new Double(Double.valueOf(result.getText().doubleValue();QF=QF*(-1);result.setTe