Java课程设计计算器源程序代码

1、package jisuanqi;import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.border.*;public class JiSuanQi extends JFrame implements ActionListener/ JiSuanQi 继承Frame实现ActionListener接口JMenuBar menubar;/定义一个菜单JMenu menu1,menu2,menu3;/定义菜单组件各个部分的对象JMenuItem menuitem1,menuitem2,me

2、nuitem3,menuitem4,menuitem5;/定义对象下的菜单项JLabel label;JButtonb1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b01,b02,b03,b04,b05;JPanel panel1,panel2,panel3;/定义三个面板String a="0"boolean b,c;Double m=0.0,n=0.0,r=0.0;Integer h=0;int d;public JiSuanQi(setTitle("jisuanqi

3、"panel1=new JPanel(;panel2=new JPanel(;panel3=new JPanel(;menubar=new JMenuBar(;/以下生成菜单组件对象menu1=new JMenu("File"menu2=new JMenu("Edit"menu3=new JMenu("Help"menuitem1=new JMenuItem("ON"menuitem2=new JMenuItem("OFF"menuitem3=new JMenuItem("C

4、lose"menuitem4=new JMenuItem("Copy"menuitem5=new JMenuItem("Help"label=new JLabel(""b1=new JButton("7"b2=new JButton("8"b3=new JButton("9"b4=new JButton("/"b5=new JButton("sqrt"b6=new JButton("4"b7=new JBu

5、tton("5"b8=new JButton("6"b9=new JButton("*"b10=new JButton("%"b11=new JButton("1"b12=new JButton("2"b13=new JButton("3"b14=new JButton("-"b15=new JButton("1/x"b16=new JButton("0"b17=new JButton("

6、;+/-"b18=new JButton("."b19=new JButton("+"b20=new JButton("="b01=new JButton("Backspace"b02=new JButton("CE"b03=new JButton("C"b04=new JButton("ON"b05=new JButton("OFF"setSize(350,240;label.setBorder(BorderFactory.

7、createBevelBorder(1;/建立一个立体的边界label.setOpaque(true;/设置不透明,以便设置背景色label.setBackground(Color.white;/设置背景色白色label.setHorizontalAlignment(SwingConstants.RIGHT;label.setCursor(new Cursor(Cursor.TEXT_CURSOR;add(panel1;GridBagLayout g=new GridBagLayout(;GridBagConstraints c=new GridBagConstraints(;panel1.s

8、etSize(350,200;panel1.setLayout(g;c.gridx=0; c.gridy=0;/这个属性是用来描述组件在布局时应处于那个网格位置,即描述网格开始的位置.gridx=0,gridy=0时放在0行0列.c.gridwidth=350; c.gridheight=20;/这两个属性用来描述组件在布局中的所占的网格的个数,gridwidth描述了该组件在横向上所占网格的个数,gridheight描述了该组件在纵向上所占网格的个数c.fill=GridBagConstraints.BOTH;c.insets=new Insets(1,1,1,1;/ 设置组件之间彼此的间距

9、。c.weightx=10.0; c.weighty=0.0;g.setConstraints(menubar,c;panel1.add(menubar;menubar.add(menu1;menubar.add(menu2;menubar.add(menu3;menu1.add(menuitem1;menu1.add(menuitem2;menu1.addSeparator(;menu1.add(menuitem3;menu2.add(menuitem4;menu3.add(menuitem5;c.gridy=20;c.gridheight=50;g.setConstraints(label

10、,c;panel1.add(label;c.gridy=70;c.gridheight=50;c.weighty=3.0;g.setConstraints(panel2,c;panel1.add(panel2;GridBagLayout i=new GridBagLayout(;GridBagConstraints j=new GridBagConstraints(;panel2.setLayout(i;j.gridx=0; j.gridy=0;j.gridwidth=68; j.gridheight=40;j.fill=GridBagConstraints.BOTH;j.insets=new

11、 Insets(1,1,1,1;j.weightx=3.0; j.weighty=3.0;i.setConstraints(b04,j;panel2.add(b04;j.gridx=70;i.setConstraints(b01,j;panel2.add(b01;j.gridx=140;i.setConstraints(b02,j;panel2.add(b02;j.gridx=210;i.setConstraints(b03,j;panel2.add(b03;j.gridx=280;i.setConstraints(b05,j;panel2.add(b05;c.gridy=120;c.grid

12、height=80;c.weighty=10.0;g.setConstraints(panel3,c;panel1.add(panel3;panel3.setLayout(new GridLayout(4,5;/pencel3面板设置为4行5列共20个网格panel3.add(b1; panel3.add(b2; panel3.add(b3; panel3.add(b4; panel3.add(b5;/添加按钮panel3.add(b6; panel3.add(b7; panel3.add(b8; panel3.add(b9; panel3.add(b10;panel3.add(b11; pa

13、nel3.add(b12; panel3.add(b13; panel3.add(b14; panel3.add(b15;panel3.add(b16; panel3.add(b17; panel3.add(b18; panel3.add(b19; panel3.add(b20;menuitem1.addActionListener(this; menuitem2.addActionListener(this; menuitem3.addActionListener(this;/注册菜单项的事件监听器b1.addActionListener(this; b2.addActionListener

14、(this; b3.addActionListener(this;b4.addActionListener(this; b5.addActionListener(this; b6.addActionListener(this;b7.addActionListener(this; b8.addActionListener(this; b9.addActionListener(this;b10.addActionListener(this; b11.addActionListener(this; b12.addActionListener(this;b13.addActionListener(th

15、is; b14.addActionListener(this; b15.addActionListener(this;b16.addActionListener(this; b17.addActionListener(this; b18.addActionListener(this;b19.addActionListener(this; b20.addActionListener(this;b01.addActionListener(this; b02.addActionListener(this; b03.addActionListener(this;b04.addActionListene

16、r(this; b05.addActionListener(this;/给按钮注册事件监视器public void actionPerformed(ActionEvent e/处理按钮事件if(e.getSource(=menuitem1label.setText(a; b=true;else if(e.getSource(=menuitem2label.setText("" b=false;else if(e.getSource(=menuitem3System.exit(0;else if(e.getSource(=b04label.setText(a; b=true;

17、else if(e.getSource(=b05label.setText("" b=false;if(bif(e.getSource(=b1if(label.getText(.equals("0"label.setText("7"elseif(!clabel.setText(label.getText(.concat("7"elselabel.setText("7" c=false; n=0.0;if(e.getSource(=b2if(label.getText(.equals("

18、0"label.setText("8"elseif(!clabel.setText(label.getText(.concat("8"elselabel.setText("8" c=false; n=0.0;if(e.getSource(=b3if(label.getText(.equals("0"label.setText("9"elseif(!clabel.setText(label.getText(.concat("9"elselabel.setText(&q

19、uot;9" c=false; n=0.0;if(e.getSource(=b6if(label.getText(.equals("0"label.setText("4"elseif(!clabel.setText(label.getText(.concat("4"elselabel.setText("4" c=false; n=0.0; if(e.getSource(=b7if(label.getText(.equals("0"label.setText("5"e

20、lseif(!clabel.setText(label.getText(.concat("5"elselabel.setText("5" c=false; n=0.0; if(e.getSource(=b8if(label.getText(.equals("0"label.setText("6"elseif(!clabel.setText(label.getText(.concat("6"elselabel.setText("6" c=false; n=0.0; if(e.g

21、etSource(=b11if(label.getText(.equals("0"label.setText("1"elseif(!clabel.setText(label.getText(.concat("1"elselabel.setText("1" c=false; n=0.0; if(e.getSource(=b12if(label.getText(.equals("0"label.setText("2"elseif(!clabel.setText(label.get

22、Text(.concat("2"elselabel.setText("2" c=false; n=0.0; if(e.getSource(=b13if(label.getText(.equals("0"label.setText("3"elseif(!clabel.setText(label.getText(.concat("3"elselabel.setText("3" c=false; n=0.0; if(e.getSource(=b16if(label.getText(

23、.equals("0"label.setText("0" else if(!clabel.setText(label.getText(.concat("0" elselabel.setText("0" c=false; n=0.0; if(e.getSource(=b18 if(!label.getText(.contains("."label.setText(label.getText(.concat("." if(e.getSource(=b4 c=true; d=1;

24、m=m.valueOf(label.getText(; if(e.getSource(=b9 c=true; d=2; m=m.valueOf(label.getText(; if(e.getSource(=b14 c=true; d=3; m=m.valueOf(label.getText(; if(e.getSource(=b19 c=true; d=4; m=m.valueOf(label.getText(; if(e.getSource(=b15 m=m.valueOf(label.getText(; if(m=0label.setText("0 没有倒数" els

25、em=1/m; if(m.toString(.endsWith(".0" h=Value(; label.setText(h.toString(; elselabel.setText(m.toString(; if(e.getSource(=b5 m=m.valueOf(label.getText(; if(m<0label.setText("负数不能被开方" else 6 m=Math.sqrt(m; if(m.toString(.endsWith(".0" h=Value(; label.setText(

26、h.toString(; elselabel.setText(m.toString(; if(e.getSource(=b10 c=true; d=5; m=m.valueOf(label.getText(; if(e.getSource(=b17 r=0-m.valueOf(label.getText(; if(r.toString(.endsWith(".0" h=Value(; label.setText(h.toString(; elselabel.setText(m.toString(; if(e.getSource(=(b20 if(n=0n=n.valueOf(label.getText(; if(d=1 if(n!=0 m=m/n; if(m.toString(.endsWith(".0" h=Value(; label.setText(h.toString(; elselabel.setText(m.toString(; elselabel.setT