科学计算器程序java代码

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1、功能举例：源程序如下：importjava.awt.BorderLayout;importjava.awt.Color;importjava.awt.Dimension;importjava.awt.Font;importjava.awt.GridLayout;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;importjava.text.DecimalFormat;importjavax.swing.BorderFacto

2、ry;importjavax.swing.ButtonGroup;importjavax.swing.JButton;importjavax.swing.JCheckBoxMenuItem;importjavax.swing.JFrame;importjavax.swing.JMenu;importjavax.swing.JMenuBar;importjavax.swing.JMenuItem;importjavax.swing.JPanel;importjavax.swing.JRadioButtonMenuI

3、tem;importjavax.swing.JTextField;publicclassCalucatorextendsJFrame{privateJTextFieldtf;privateJPanelpanel1,panel2,panel3,panel4;privateJMenuBarmyBar;privateJMenumenu1,menu2,menu3;privateJMenuItemeditItem1,editItem2,help1,help2,help3;privateJRadioButtonMenuIte

4、mseeItem1,seeItem2;//单选框privateJCheckBoxMenuItemseeItem3;//复选框privateButtonGroupbgb;privateStringback;privatebooleanIfResult=true,flag=false;privateStringoper="=";privatedoubleresult=0;privateNumnumActionListener;privateDecimalFormatdf;publicCalucator(){super

5、("科学计算器");//设置标题栏df=newDecimalFormat("#.####");//保留四位小数this.setLayout(newBorderLayout(10,5));panel1=newJPanel(newGridLayout(1,3,10,10));panel2=newJPanel(newGridLayout(5,6,5,5));//5行6列panel3=newJPanel(newGridLayout(5,1,5,5));panel4=newJPanel(newBorderLayout(5,

6、5));/***菜单栏*/myBar=newJMenuBar();menu1=newJMenu("编辑(E)");menu2=newJMenu("查看(V)");menu3=newJMenu("帮助(H)");menu1.setFont(newFont("宋体",Font.PLAIN,12));menu2.setFont(newFont("宋体",Font.PLAIN,12));menu3.setFont(newFont("宋体",Font.PLAIN,12));/***编辑栏*/editItem1=newJMe

7、nuItem("复制(C)Ctrl+C");editItem2=newJMenuItem("粘贴(P)Ctrl+V");editItem1.setFont(newFont("宋体",Font.PLAIN,12));editItem2.setFont(newFont("宋体",Font.PLAIN,12));/***查看栏*/seeItem1=newJRadioButtonMenuItem("科学型(T)");seeItem2=newJRadioButtonMenuItem("标准型(S)");seeItem3=n

8、ewJCheckBoxMenuItem("数字分组(I)");seeItem1.setFont(newFont("宋体",Font.PLAIN,12));seeItem2.setFont(newFont("宋体",Font.PLAIN,12));seeItem3.setFont(newFont("宋体",Font.PLAIN,12));/***帮助栏*/help1=new