java简单计算器.docx

1、java简单计算器源文件一：calculation.javaimport java.util.LinkedList;public class calculation intermediary itmd=intermediary.getIntermediary(); LinkedList fomula=itmd.getFomula(); OperationFactory opf=new OperationFactory(); public void calculat() double result=0; int flag=0;/标志是否有括号,1表示有括号 /n记录最后一个正括号的位置，i记录第

2、一个反括号的位置 for(int i=0,n=0;ifomula.size();i+) System.out.print(fomula.get(i);/输出集合元素 if(fomula.get(i).equals() while(fomula.get(i).equals() i+; n=i; i+; while(!fomula.get(i).equals() i+; simpCalculat(n,i-1); fomula.remove(n+1); fomula.remove(n-1); result=Double.valueOf(fomula.get(n-1); i=-1; n=0; if(f

3、omula.size()3) if(!(fomula.get(0) instanceof String ) result=Double.valueOf(fomula.get(0); else result=Double.valueOf(fomula.get(1); itmd.setResult(result); else result=simpCalculat(0,fomula.size()-1); itmd.setResult(result); private double simpCalculat(int n,int m) double result =0; / for(int i=0,n

4、=0;ifomula.size()-1;i+) while(nm-1) / if(fomula.get(n+1) instanceof String) for(int i=n;im;i+) if(fomula.get(i).equals(*)|fomula.get(i).equals(/) Operation op=opf.creatOperate(String)fomula.get(i); op.setNumber(Double.valueOf(fomula.get(i-1) ,Double.valueOf(fomula.get(i+1); result=op.getResult(); fo

5、mula.remove(i); fomula.remove(i); fomula.set(i-1, (Double)result).toString(); m=m-2; for(int i=n;im;i+) Operation op=opf.creatOperate(String)fomula.get(n+1); op.setNumber(Double.valueOf(fomula.get(n),Double.valueOf(fomula.get(n+2); result=op.getResult(); fomula.remove(n+1); fomula.remove(n+1); fomul

6、a.set(n, (Double)result).toString(); m=m-2; return result; 源文件二：intermediary.javaimport java.util.LinkedList;/* * 中介类： * 从前台接受输入的数据，并传入后台计算 * 将后台计算好的结果传入前台 * author Administrator * */public class intermediary private static intermediary itmd=new intermediary(); private LinkedList fomula=new LinkedLi

7、st();/算式集合 private double result;/计算结果 private intermediary() static intermediary getIntermediary() return itmd; protected LinkedList getFomula() int k=0;/运算数与运算符的个数和 int begin=0,end=0; for(int i=0;ifomula.size();i+) int flag=0;/等于一时标志找到第一个数位 String s=fomula.get(i); if(s.matches(0-9.)&flag=0) begin=

8、i; flag=1; k+; if(!s.matches(0-9.)&flag=1) double d1=0,d2=0; int flag2=0;/等于一时表示遇到小数点 for(int n=begin;nend;n+) int a=0;/记录小数点的位置 if(s=.) flag2=1; if(flag2!=1) d1=d1+Integer.valueOf(fomula.get(n)*Math.pow(10, i); a=i; else d2=d2+Integer.valueOf(fomula.get(n)*Math.pow(0.1,i-a); Double d=d1+d2; fomula.

9、set(k, d.toString(); k=k+2; for(int num=k;numi;num+) fomula.remove(k); k+; i=k; return fomula; /* for(int i=0;ifomula.size();i+) try String s=fomula.get(i); if(s.matches(0-9.) if(!s.matches(0-9.) double d1=0,d2=0; int flag=0; for(int n=0;ni;n+) int a=0; if(s=.) flag=1; if(flag!=1) d1=d1+Integer.valu

10、eOf(fomula.get(n)*Math.pow(10, i); a=i; else d2=d2+Integer.valueOf(fomula.get(n)*Math.pow(0.1,i-a); Double d=d1+d2; fomula.set(k, d.toString(); k=k+2; for(int num=k;numi;num+) fomula.remove(k); else k+; i=k; catch(Exception e) */ protected void setFomula(String s) fomula.add(s); protected double get

11、Result() return result; protected void setResult(double result) this.result = result; 源文件三：Operation.javapublic abstract class Operation protected double numberA; protected double numberB; protected void setNumber(Double numberA,Double numberB) this.numberA = numberA; this.numberB = numberB; public

12、abstract double getResult();源文件四：OperationAdd.javapublic class OperationAdd extends Operation Override public double getResult() / TODO Auto-generated method stub double result=0; result=numberA+numberB; return result; 源文件五：OperationDiv.javapublic class OperationDiv extends Operation Override public

13、 double getResult() / TODO Auto-generated method stub try double result=0; result=numberA/numberB; return result; catch(ArithmeticException e) System.out.println(算术异常); return 0; 源文件六：OperationFactory.javapublic class OperationFactory public Operation creatOperate(String object) Operation oper=null;

14、 switch(object) case +:oper=new OperationAdd();break; case -:oper=new OperationSub();break; case *:oper=new OperationMul();break; case /:oper=new OperationDiv();break; default:System.out.println(该计算器不具备此种运算的能力); return oper; 源文件七：OperationMul.javapublic class OperationMul extends Operation Override

15、public double getResult() / TODO Auto-generated method stub double result=0; result=numberA*numberB; return result; 源文件八：OperationSub.javapublic class OperationSub extends Operation Override public double getResult() / TODO Auto-generated method stub double result=0; result=numberA-numberB; return r

16、esult; 源文件九：winder.javaimport java.awt.BorderLayout;import java.awt.EventQueue;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;import javax.swing.JButton;import javax.swing.JTextField;import java.awt.event.ActionListener;import java.awt.event.ActionEvent;imp

17、ort java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import java.util.ArrayList;import java.util.LinkedList;public class winder extends JFrame private JPanel contentPane; private JTextField textField; private String s=; /* * Launch the application. */ public

18、 static void main(String args) EventQueue.invokeLater(new Runnable() public void run() try winder frame = new winder(); /添加键盘事件 frame.addKeyListener(new KeyListener() public void keyPressed(KeyEvent e) System.out.println(e.getKeyChar(); Override public void keyReleased(KeyEvent arg0) / TODO Auto-gen

19、erated method stub Override public void keyTyped(KeyEvent arg0) / TODO Auto-generated method stub ); frame.setVisible(true); catch (Exception e) e.printStackTrace(); ); /* * Create the frame. */ public winder() setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 276, 338); contentPan

20、e = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5); setContentPane(contentPane); contentPane.setLayout(null); JButton btnNewButton = new JButton(1); btnNewButton.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) String i=e.getActionCommand();/得到按钮上的字符

21、 s=s+i; intermediary.getIntermediary().setFomula(i); textField.setText(s); ); btnNewButton.setBounds(70, 68, 50, 30); contentPane.add(btnNewButton); JButton button = new JButton(/); button.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) String i=e.getActionCommand()

22、;/得到按钮上的字符 s=s+i; intermediary.getIntermediary().setFomula(i); textField.setText(s); ); button.setBounds(10, 188, 50, 30); contentPane.add(button); JButton button_1 = new JButton(2); button_1.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) String i=e.getActionComman

23、d();/得到按钮上的字符 s=s+i; intermediary.getIntermediary().setFomula(i); textField.setText(s); ); button_1.setBounds(130, 68, 50, 30); contentPane.add(button_1); JButton button_2 = new JButton(3); button_2.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) String i=e.getActio

24、nCommand();/得到按钮上的字符 s=s+i; intermediary.getIntermediary().setFomula(i); textField.setText(s); ); button_2.setBounds(190, 68, 50, 30); contentPane.add(button_2); JButton button_3 = new JButton(+); button_3.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) String i=e.g

25、etActionCommand();/得到按钮上的字符 s=s+i; intermediary.getIntermediary().setFomula(i); textField.setText(s); ); button_3.setBounds(10, 68, 50, 30); contentPane.add(button_3); JButton button_4 = new JButton(4); button_4.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) String

26、 i=e.getActionCommand();/得到按钮上的字符 s=s+i; intermediary.getIntermediary().setFomula(i); textField.setText(s); ); button_4.setBounds(70, 108, 50, 30); contentPane.add(button_4); JButton button_5 = new JButton(5); button_5.addActionListener(new ActionListener() public void actionPerformed(ActionEvent e) String i=e.getActionCommand();/得到按钮上的字符 s=s+i; intermediary.getIntermediary().setFomula(i); textField.setText(s); ); button_5.setBounds(130, 108, 50, 30); contentPane.add(button_5); JButton button_6 = new JBu