java双模式计算器

基本思想：计算器分为3部分，菜单、普通计算器、式子计算器。用两个类分别建立容器存储相应的组件，在菜单选择中通过remove（）、repaint() （删除组件后刷新）和add（）、validate()（添加组件后刷新）实现模式的转换，同时在菜单中也实现计算器参数初始化。2种计算器共用GridBagLayout可变布局、GridBagConstraints布局设置、Numer 数值类，addbutton（）单个按钮添加函数、addTextField（）输入区添加函数、光标定位等等。import java.awt.Container;import java.awt.Font;import java.awt.GridBagConstraints;import java.awt.GridBagLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.JOptionPane;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField;public class Caculater extends JFramepublic GridBagLayout layout=new GridBagLayout();/可变布局public GridBagConstraints constraints=new GridBagConstraints();/布局设置Numer result=new Numer();/结果暂存Numer M;/结果存储器int fpoint=0;/textField 光标定位Cater cater=new Cater();/标准计算器Cator cator=new Cator();/普通计算器private boolean type=false;/判断是否是普通计算器public Caculater()super(“计算器“);addMenu();add(cater.container);public class Caterprivate Container container=new Container();/容器JTextArea textArea=new JTextArea();/显示区JTextField textField=new JTextField();/输入区int apoint=0;/textArea 光标定位int upoint=0;/memory使用向上的位置String formula=“;/式子String copty=“;/复制的式子Memory memorys=new Memory100;/存储历史最大记录int number=0;/存储计数器boolean upfirst=true;/判断是否首次使用向上public Cater()container.setLayout(layout);addTextArea();addTextField(1,1,1,5,container,textField);addButton();private void addTextArea()constraints.gridx=0;/组件x 位置constraints.gridy=0;/组件y 位置constraints.gridheight=1;/组件高度constraints.gridwidth=10;/组件宽度constraints.fill=GridBagConstraints.BOTH;/constraints.weightx=1;constraints.weighty=1;textArea.setEditable(false);JScrollPane spane=new JScrollPane(textArea);textArea.setFont(new Font(“Serif“,Font.PLAIN,18);layout.setConstraints(spane, constraints);spane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);container.add(spane);/添加按钮private void addButton()InsertAction insert=new InsertAction();CommandAction command=new CommandAction();addbutton(“MC“,0,2,1,1,command,container);addbutton(“MR“,1,2,1,1,command,container);addbutton(“MS“,2,2,1,1,command,container);addbutton(“M+“,3,2,1,1,command,container);addbutton(“M-“,4,2,1,1,command,container);addbutton(“Delete“,0,3,1,1,insert,container);addbutton(“CE“,1,3,1,1,insert,container);addbutton(“C“,2,3,1,1,insert,container);addbutton(“,3,3,1,1,insert,container);addbutton(“,4,3,1,1,command,container);addbutton(“7“,0,4,1,1,insert,container);addbutton(“8“,1,4,1,1,insert,container);addbutton(“9“,2,4,1,1,insert,container);addbutton(“,3,4,1,1,command,container);addbutton(“%“,4,4,1,1,command,container);addbutton(“4“,0,5,1,1,insert,container);addbutton(“5“,1,5,1,1,insert,container);addbutton(“6“,2,5,1,1,insert,container);addbutton(“,3,5,1,1,command,container);addbutton(“1/x“,4,5,1,1,command,container);addbutton(“1“,0,6,1,1,insert,container);addbutton(“2“,1,6,1,1,insert,container);addbutton(“3“,2,6,1,1,insert,container);addbutton(“ ,3,6,1,1,command,container);addbutton(“ ,4,6,1,1,command,container);addbutton(“0“,0,7,1,1,insert,container);addbutton(“.“,1,7,1,1,insert,container);addbutton(“(“,2,7,1,1,command,container);addbutton(“)“,3,7,1,1,command,container);addbutton(“=“,4,7,2,1,command,container);addbutton(“,0,8,1,1,command,container);addbutton(“,1,8,1,1,command,container);addbutton(“,2,8,1,1,command,container);addbutton(“,3,8,1,1,command,container);public class MemoryString formula=new String();Numer result;Memory(String s,Numer r)formula=s;result=new Numer(r);void delete()result=null;formula=“;boolean isEmpty()return formula.isEmpty();String print()String s;s=formula+“=“+result.putnum();return s;/设置数值按钮监听器private class InsertAction implements ActionListenerpublic void actionPerformed(ActionEvent event)String input=event.getActionCommand();String output=textField.getText();if(!input.equals(“)if(input.equals(“Delete“)if(fpoint0)textField.setText(output.substring(0,fpoint-1)+output.substring(fpoint,output.length();if(fpoint0)fpoint-;else if(apoint0)if(apoint=formula.length()formula=formula.substring(0,apoint-1);textArea.setText(formula);elseformula=formula.substring(0,apoint-1)+formula.substring(apoint,formula.length();textArea.setText(formula.substring(0,apoint-1)+“+formula.substring(apoint-1,formula.length();if(apoint0)apoint-;return;if(input.equals(“.“)if(output.indexOf(“.“)=-1)if(apoint0)textField.setText(output.substring(0, fpoint)+input+output.substring(fpoint,output.length() );fpoint+;output=textField.getText();else if(fpoint=output.length()if(output.length()=0)textField.setText(“0.“);fpoint=2;else textField.setText(output+“.“);fpoint+;return;/键入数字if(!input.equals(“)textField.setText(output.substring(0,fpoint)+“ +output.substring(fpoint,output.length();else if(!aput.isEmpty()if(apoint0)apoint-;textArea.setText(aput.substring(0, apoint)+“+aput.substring(apoint, aput.length();return;if(input.equals(“)if(!output.isEmpty()if(fpoint=99)upoint=0;else upoint+;elsetextArea.setText(memorysupoint.print();textField.setText(“);apoint=0;return;if(input.equals(“)if(upfirst)if(memorysnumber=null)upoint=0;else upoint=number+1;textArea.setText(“+upoint);upfirst=false;if(upoint=99)upoint=0;else upoint+;if(number=0textArea.setText(formula);if(upoint=0)upoint=99;else upoint-;elsetextArea.setText(memorysupoint.print();textField.setText(“);apoint=0;return;if(input.equals(“1/x“)if(Double.parseDouble(output)!=0fpoint=textField.getText().length();else if(Double.parseDouble(output)=0)JOptionPane.showMessageDialog(Caculater.this,String.format(“%s“, “错误！分母不能为0！“);else JOptionPane.showMessageDialog(Caculater.this,String.format(“%s“, “错误！当前情况不能求倒数！“);return;if(input.equals(“=“)/开始计算formula=textArea.getText();if(!output.isEmpty()formula+=output;textField.setText(“);fpoint=0;apoint=formula.length();formula=re_formula(formula);result.rnumber(caculete(formula);memorysnumber=new Memory(formula,result);if(number=99)number=0;else number+;textArea.setText(formula+input+result.putnum();formula=“;textArea.setEditable(false);/保证再次使用时失去任意修改的功能return;if(apoint0;s=str.substring(n,n+1)if(isnum.indexOf(s)=-1)n+;break;n-;return str.length()-n;/剔除不属于正确式子的字符String re_formula(String str)String test=“-.1234567890%()“ ;String s=“;if(str.indexOf(“=“)!=-1)int n=str.indexOf(“=“);str=str.substring(0, n);for(int i=0;i0)textField.setText(output.substring(0,fpoint-1)+output.substring(fpoint,output.length();/else if(fpoint0)fpoint-;return;/删除前一次计算的结果if(fpoint=output.length()output=textField.getText();fpoint=output.length();setoperator=false;if(input.equals(“.“)if(output.indexOf(“.“)=-1)if(fpoint0)textField.setText(output.substring(0, fpoint)+input+output.substring(fpoint,output.length() );fpoint+;output=textField.getText();else if(fpoint=output.length()if(output.length()=0)textField.setText(“0.“);else textField.setText(output+“.“);output=textField.getText();fpoint=output.length();start=true;return;/键入数字if(!input.equals(“)fpoint=input.length(); start=true;return;/在中间插入数字if(fpoint0)fpoint-;textField.setText(output.substring(0,fpoint)+“ +output.substring(fpoint,output.length();return;if(input.equals(“)if(!output.equals(“)if(fpointoutput.length()fpoint+;if(fpointoutput.length()textField.setText(output.substring(0,fpoint)+“ +output.substring(fpoint,output.length();return;if(input.equals(“1/x“)|input.equals(“)lastCommand=input;if(input.equals(“=“)/第一次使用等号需要更新，以后重复使用，就不断重复最后一次运算if(!den)last=output;num.rnumber(last);if(lastCommand.equals(“)|lastCommand.equals(“1/x“)/单操作符需要不断更新最后值last=output;num.rnumber(last);calculate(num);start=false;setoperator=true;den=true;return;if(den)/停止使用等号lastCommand=“=“;den=false;if(start)/防止重复输入操作符时，把结果当作输入进行计算last=output;num.rnumber(last);calculate(num);lastCommand=input;else lastCommand=input;start=false;setoperator=true;public void calculate(Numer x) if(lastCommand.equals(“)result.n=x.n;result.d=x.d;result.sqrt();if(lastCommand.equals(“1/x“)result.n=x.n;result.d=x.d;result.countdown();if (lastCommand.equals(“) result.add(x); else if (lastCommand.equals(“) result.sub(x);else if (lastCommand.equals(“) result.mul(x); else if (lastCommand.equals(“) result.divide(x);else if (lastCommand.equals(“%“) if(result.isint()else JOptionPane.showMessageDialog(Caculater.this,String.format(“%s“, “求余数的参数必须为整数！“);else if (lastCommand.equals(“=“) result.d=x.d;result.n=x.n;textField.setText(“+result.putnum();fpoint=textField.getText().length();public void addbutton(String label,int x,int y,int height,int width,ActionListener listener,Container container)JButton button=new JButton(label);constraints.gridx=x;constraints.gridy=y;constraints.gridheight=height;constraints.gridwidth=width;constraints.fill=GridBagConstraints.BOTH;button.addActionListener(listener);layout.setConstraints(button,constraints);container.add(button);public void addTextField(int x,int y,int height,int width,Container container,JTextField textField)constraints.gridx=x;/组件x 位置constraints.gridy=y;/组件y 位置constraints.gridheight=height;/组件高度constraints.gridwidth=width;/组件宽度constraints.fill=GridBagConstraints.BOTH;/组件随显示变化的选项constraints.weightx=1;/水平扩展，即显示变化时，长度变化constraints.weighty=1;/垂直扩展，即高度变化textField.setHorizontalAlignment(JTextField.RIGHT);/光标右边显示textField.setEditable(false);/不可编辑textField.setFont(new Font(“Serif“,Font.PLAIN,18);/显示字体layout.setConstraints(textField, constraints);/把布局设置应用到组件上container.add(textField);/把该组件添加到容器中private void addMenu()JMenu menus=new JMenu3;menus0=new JMenu(“查看(V)“);menus0.setMnemonic(F);menus1=new JMenu(“编辑(E)“);menus1.setMnemonic(E);menus2=new JMenu(“帮助(H)“);menus2.setMnemonic(H);JMenuItem lookItem=new JMenuItem2;JMenuItem aditItem=new JMenuItem3;JMenuItem helpItem=new JMenuItem2;lookItem0=new JMenuItem(“普通型(O)“);lookItem0.setMnemonic(O);lookItem1=new JMenuItem(“标准型(T)“);lookItem1.setMnemonic(T);aditItem0=new JMenuItem(“复制(C) Ctrl+C“);aditItem0.setMnemonic(C);aditItem1=new JMenuItem(“粘贴(P) Ctrl+V“);aditItem1.setMnemonic(P);aditItem2=new JMenuItem(“自由编辑(F)“);aditItem2.setMnemonic(F);helpItem0=new JMenuItem(“关于主题(H)“);helpItem0.setMnemonic(H);helpItem1=new JMenuItem(“关于计算器(A)“);MenuAction menuaction=new MenuAction();lookItem0.addActionListener(menuaction);lookItem1.addActionListener(menuaction);aditItem0.addActionListener(menuaction);aditItem1.addActionListener(menuaction);aditItem2.addActionListener(menuaction);helpItem0.addActionListener(menuaction);helpItem1.addActionListener(menuaction);JMenuBar bar=new JMenuBar();menus0.add(lookItem0);menus0.add(lookItem1);menus1.add(aditItem0);menus1.add(aditItem1);menus1.add(aditItem2);menus2.add(helpItem0);menus2.add(helpItem1);setJMenuBar(bar);bar.add(menus0);bar.add(menus1);bar.add(menus2);private class MenuAction implements ActionListenerpublic void actionPerformed(ActionEvent event)String input=event.getActionCommand();if(input.equals(“关于主题(H)“)JOptionPane.showMessageDialog(Caculater.this,String.format(“%s“, “花了快半个月了。n“+“ -许先斌n“ +“ 2011.8.12“);return;if(input.equals(“关于计算器(A)“)JOptionPane.showMessageDialog(Caculater.this,String.format(“%s“, “该计算器最多存储100条记录。n“ +“计算器需要确保输入正确，否则得不到答案。n“+“计算器上的计算符号与键盘的不一样，最好不要由键盘输入。“);return;if(input.equals(“复制(C) Ctrl+C“)cater.copty=cater.memoryscater.upoint.formula;JOptionPane.showMessageDialog(Caculater.this,String.format(“复制%s“, cater.copty);return;if(input.equals(“粘贴(P) Ctrl+V“)cater.formula=cater.formula.substring(0, cater.apoint)+cater.copty+cater.formula.substring(cater.apoint);JOptionPane.showMessageDialog(Caculater.this,String.format(“%s“, “粘贴成功！“ );cater.textArea.setText(cater.formula);return;if(input.equals(“自由编辑(F)“)cater.textArea.setEditable(true);if(input.equals(“普通型(O)“)if(!type)Caculater.this.remove(Caculater.this.cater.container);/去掉标准计算器容器repaint();/显示Caculater.this.add(Caculater.this.cator.container);/添加普通计算器容器validate();/显示/普通计算器参数初始化cator.textField.setText(“);fpoint=0;cator.last=“0“;result.d=0;result.n=0;cator.lastCommand=“=“;M=null;cator.start=false;cator.setoperator=false;cator.den=false;type=true;return;if(input.equals(“标准型(T)“)if(type)Caculater.this.remove(Caculater.this.cator.container);repaint();Caculater.this.add(Caculater.this.cater.container);validate();cater.textField.setText(“);cater.textArea.setText(“);fpoint=0;cater.apoint=0;cater.upoint=0;result.d=0;