用java.EE编写计算器程序代码

微信公开课小程序热门讨论「用java.EE编写计算器程序代码###javaEE是java企业级开发平台的意思，实在是看不出跟计算器这种小程序有什么关联。不知道楼主要找的是不是这个。packageex1;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.BorderFactory;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.JRadioButtonMenuItem;importjavax.swing.JTextField;publicclassCalcutorextendsJFrame{privateJTextFieldtf;privateJPanelpanel1,panel2,panel3,panel4;privateJMenuBarmyBar;privateJMenumenu1,menu2,menu3;privateJMenuItemeditItem1,editItem2,help1,help2,help3;privateJRadioButtonMenuItemseeItem1,seeItem2;//单选框privateJCheckBoxMenuItemseeItem3;//复选框privateButtonGroupbgb;privateStringback;privatebooleanIfResult=true,flag=false;privateStringoper==;privatedoubleresult=0;privateNumnumActionListener;privateDecimalFormatdf;publicCalcutor(){super(科学计算器);//设置标题栏df=newDecimalFormat(#.#」最新回复-);//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(5,5));/***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=newJMenuItem(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=newJCheckBoxMenuItem(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=newJMenuItem(帮助主题(H));help2=newJMenuItem(关于计算器(A));help1.setFont(newFont(宋体,Font.PLAIN,12));help2.setFont(newFont(宋体,Font.PLAIN,12));bgb=newButtonGroup();//选项组menu1.add(editItem1);menu1.add(editItem2);menu2.add(seeItem1);menu2.add(seeItem2);menu2.addSeparator();//添加一条分割线menu2.add(seeItem3);menu3.add(help1);menu3.addSeparator();//添加一条分割线menu3.add(help2);myBar.add(menu1);myBar.add(menu2);myBar.add(menu3);this.setJMenuBar(myBar);numActionListener=newNum();//实现数字监听/***文本域，即为计算器的屏幕显示区域*/tf=newJTextField();tf.setEditable(false);//文本区域不可编辑tf.setBackground(Color.white);//文本区域的背景色tf.setHorizontalAlignment(JTextField.RIGHT);//文字右对齐tf.setText(0);tf.setBorder(BorderFactory.createLoweredBevelBorder());init();//对计算器进行初始化}/***初始化操作*添加按钮*/privatevoidinit(){addButton(panel1,Backspace,newClear(),Color.red);addButton(panel1,CE,newClear(),Color.red);addButton(panel1,C,newClear(),Color.red);addButton(panel2,1/x,newSigns(),Color.magenta);addButton(panel2,log,newSigns(),Color.magenta);addButton(panel2,7,numActionListener,Color.blue);addButton(panel2,8,numActionListener,Color.blue);addButton(panel2,9,numActionListener,Color.blue);addButton(panel2,÷,newSigns(),Color.red);addButton(panel2,n!,newSigns(),Color.magenta);addButton(panel2,sqrt,newSigns(),Color.magenta);addButton(panel2,4,numActionListener,Color.blue);addButton(panel2,5,numActionListener,Color.blue);addButton(panel2,6,numActionListener,Color.blue);addButton(panel2,×,newSigns(),Color.red);addButton(panel2,sin,newSigns(),Color.magenta);addButton(panel2,x^2,newSigns(),Color.magenta);addButton(panel2,1,numActionListener,Color.blue);addButton(panel2,2,numActionListener,Color.blue);addButton(panel2,3,numActionListener,Color.blue);addButton(panel2,,newSigns(),Color.red);addButton(panel2,cos,newSigns(),Color.magenta);addButton(panel2,x^3,newSigns(),Color.magenta);addButton(panel2,0,numActionListener,Color.blue);addButton(panel2,/+,newClear(),Color.blue);addButton(panel2,.,newDot(),Color.blue);addButton(panel2,+,newSigns(),Color.red);addButton(panel2,tan,newSigns(),Color.magenta);addButton(panel2,%,newSigns(),Color.magenta);addButton(panel2,π,numActionListener,Color.orange);addButton(panel2,e,numActionListener,Color.orange);addButton(panel2,′″,newSigns(),Color.orange);addButton(panel2,=,newSigns(),Color.red);JButtonbtns=newJButton(计算器);btns.setBorder(BorderFactory.createLoweredBevelBorder());btns.setEnabled(false);//按钮不可操作btns.setPreferredSize(newDimension(20,20));panel3.add(btns);//加入按钮addButton(panel3,MC,null,Color.red);addButton(panel3,MR,null,Color.red);addButton(panel3,MS,null,Color.red);addButton(panel3,M+,null,Color.red);panel4.add(panel1,BorderLayout.NORTH);panel4.add(panel2,BorderLayout.CENTER);this.add(tf,BorderLayout.NORTH);this.add(panel3,BorderLayout.WEST);this.add(panel4);pack();this.setResizable(false);//窗口不可改变大小this.setLocation(300,200);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}/***统一设置按钮的的使用方式*@parampanel*@paramname*@paramaction*@paramcolor*/privatevoidaddButton(JPanelpanel,Stringname,ActionListeneraction,Colorcolor){JButtonbt=newJButton(name);panel.add(bt);//在面板上增加按钮bt.setForeground(color);//设置前景（字体）颜色bt.addActionListener(action);//增加监听事件}/***计算器的基础操作（+×÷）*@paramx*/privatevoidgetResult(doublex){if(oper==+){result+=x;}elseif(oper==){result=x;}elseif(oper==×){result*=x;}elseif(oper==÷){result/=x;}elseif(oper===){result=x;}tf.setText(df.format(result));}/***运算符号的事件监听*/classSignsimplementsActionListener{publicvoidactionPerformed(ActionEvente){/**用ActionEvent对象的getActionCommand()方法*取得与引发事件对象相关的字符串*/Stringstr=e.getActionCommand();/*sqrt求平方根*/if(str.equals(sqrt)){doublei=Double.parseDouble(tf.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*/tf.setText(String.valueOf(df.format(Math.sqrt(i))));}else{tf.setText(负数不能开平方根);}}/*log求常用对数*/elseif(str.equals(log)){doublei=Double.parseDouble(tf.getText());if(i0){tf.setText(String.valueOf(df.format(Math.log(i))));}else{tf.setText(负数不能求对数);}}/*%求百分比*/elseif(str.equals(%)){tf.setText(df.format(Double.parseDouble(tf.getText())/100));}/*1/x求倒数*/elseif(str.equals(1/x)){if(Double.parseDouble(tf.getText())==0){tf.setText(除数不能为零);}else{tf.setText(df.format(1/Double.parseDouble(tf.getText())));}}/*sin求正弦函数*/elseif(str.equals(sin)){doublei=Double.parseDouble(tf.getText());tf.setText(String.valueOf(df.format(Math.sin(i))));}/*cos求余弦函数*/elseif(str.equals(cos)){doublei=Double.parseDouble(tf.getText());tf.setText(String.valueOf(df.format(Math.cos(i))));}/*tan求正切函数*/elseif(str.equals(tan)){doublei=Double.parseDouble(tf.getText());tf.setText(String.valueOf(df.format(Math.tan(i))));}/*n!求阶乘*/elseif(str.equals(n!)){doublei=Double.parseDouble(tf.getText());if((i%2==0)||(i%2==1))//判断为整数放进行阶乘操作{intj=(int)i;//强制类型转换intresult=1;for(intk=1;k=j;k++)result*=k;tf.setText(String.valueOf(result));}else{tf.setText(无法进行阶乘);}}/*x^2求平方*/elseif(str.equals(x^2)){doublei=Double.parseDouble(tf.getText());tf.setText(String.valueOf(df.format(i*i)));}/*x^3求立方*/elseif(str.equals(x^3)){doublei=Double.parseDouble(tf.getText());tf.setText(String.valueOf(df.format(i*i*i)));}/*′″角度转换*//***将角度值转换成弧度值，方便三角函数的计算*/elseif(str.equals(′″)){doublei=Double.parseDouble(tf.getText());tf.setText(String.valueOf(i/180*Math.PI));}else{if(flag){IfResult=false;}if(IfResult){oper=str;}else{getResult(Double.parseDouble(tf.getText()));oper=str;IfResult=true;}}}}/***清除按钮的事件监听*/classClearimplementsActionListener{publicvoidactionPerformed(ActionEvente){/**用ActionEvent对象的getActionCommand()方法*取得与引发事件对象相关的字符串*/Stringstr=e.getActionCommand();if(str==C){tf.setText(0);IfResult=true;result=0;}elseif(str==/+){doublei=0Double.parseDouble(tf.getText().trim());tf.setText(df.format(i));}elseif(str==Backspace){if(Double.parseDouble(tf.getText())0){if(tf.getText().length()1){tf.setText(tf.getText().substring(0,tf.getText().length()1));//使用退格删除最后一位字符}else{tf.setText(0);IfResult=true;}}else{if(tf.getText().length()2){tf.setText(tf.getText().substring(0,tf.getText().length()1));}else{tf.setText(0);IfResult=true;}}}elseif(str==CE){tf.setText(0);IfResult=true;}}}/***数字输入的事件监听*/classNumimplementsActionListener{publicvoidactionPerformed(ActionEvente){Stringstr=e.getActionCommand();if(IfResult){tf.setText();IfResult=false;}if(str==π){tf.setText(String.valueOf(Math.PI));}elseif(str==e){tf.setText(String.valueOf(Math.E));}else{tf.setText(tf.getText().trim()+str);if(tf.getText().equals(0)){tf.setText(0);IfResult=true;flag=true;}}}}/***小数点的事件监听*/classDotimplementsActionListener{publicvoidactionPerformed(ActionEvente){IfResult=false;if(tf.getText().trim().indexOf(.)==1){tf.setText(tf.getText()+.);}}}/***main方法*/publicstaticvoidmain(String[]args){newCalcutor().setVisible(true);}}
importjava.awt.BorderLayout;importjava.awt.GridLayout;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;importjavax.swing.JButton;importjavax.swing.JFrame;importjavax.swing.JPanel;importjavax.swing.JTextField;publicclass计算机extendsJFrame{//第一个数StringfirstNum=;//第二个数StringsecondNum=;//判断是否点击了=-*/booleanflag=true;//操作标记Stringbiaoji=;public计算机(){setDefaultCloseOperation(DISPOSE_ON_CLOSE);finalJTextFieldtf_num=newJTextField(); add(tf_num,BorderLayout.NORTH);JPanelp=newJPanel(); p.setLayout(newGridLayout(4,4)); Stringstr=789/456*123-0.=+; for(inti=0;istr.length();i++){  charc=str.charAt(i);  JButtonb=newJButton(c+);  p.add(b);  b.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEventarg0){ ////得到选中的按钮 Objectobj=arg0.getSource(); ////强制转换成button JButtonselect_btn=(JButton)obj; ////得到按钮上的信息 Stringvalues=select_btn.getText();//////////////////判断是否为数字  if(1234567890..indexOf(values)=0){ if(flag){Stringoid=tf_num.getText();tf_num.setText(oid+values); }else{tf_num.setText(values);flag=true;  }  } /////////////////判断按钮为+-*/中一个 if(+-*/.indexOf(values)=0){ firstNum=tf_num.getText();  biaoji=values;  flag=false; }if(values.equals(=)){ doublesum=0;  secondNum=tf_num.getText(); if(biaoji.equals(+)){sum=Double.parseDouble(firstNum)+Double.parseDouble(secondNum);  } if(biaoji.equals(-)){sum=Double.parseDouble(firstNum)-Double.parseDouble(secondNum);  } if(biaoji.equals(*)){sum=Double.parseDouble(firstNum)*Double.parseDouble(secondNum);  } if(biaoji.equals(/)){sum=Double.parseDouble(firstNum)/Double.parseDouble(secondNum);  }tf_num.setText(sum+);  flag=false;}}});}add(p); setSize(200,200); setVisible(true);  } publicstaticvoidmain(String[]args){new计算机();}} 更多有关「用java.EE编写计算器程序代码###javaEE是java企业级开发平台的意思，实在是看不出跟计算器这种小程序有什么关联。不知道楼主要找的是不是这个。packageex1;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.BorderFactory;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.JRadioButtonMenuItem;importjavax.swing.JTextField;publicclassCalcutorextendsJFrame{privateJTextFieldtf;privateJPanelpanel1,panel2,panel3,panel4;privateJMenuBarmyBar;privateJMenumenu1,menu2,menu3;privateJMenuItemeditItem1,editItem2,help1,help2,help3;privateJRadioButtonMenuItemseeItem1,seeItem2;//单选框privateJCheckBoxMenuItemseeItem3;//复选框privateButtonGroupbgb;privateStringback;privatebooleanIfResult=true,flag=false;privateStringoper==;privatedoubleresult=0;privateNumnumActionListener;privateDecimalFormatdf;publicCalcutor(){super(科学计算器);//设置标题栏df=newDecimalFormat(#.#」的疑问请扫码关注微信公开课+小程序！