一个带有括号的计算器

为了应付作业而编的，一个新手，请大家多多指教。/** * Title: Calculator * Description: * Copyright: Copyright (c) 2004 * Company: CUIT * Calculator.java * Created on 2004年10月13日, 下午2:35 * @author jacktom * @version 1.0*/import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Calculator extends JFrame implements ActionListener{ Operator oper; String a,result; int type; boolean flag1=false; boolean flag2=false; boolean judge=true; int count=0; JTextField text; JPanel jpanel[]; JPanel jpanel1; JButton jbutton[]; String name[]={"0",".","-/+","+","=","1","2","3","-",")","4","5","6","*","(","7","8","9","/","CE"}; //Construct the JFrame public Calculator() { oper=new Operator(); setSize(250,300); setVisible(true); //Overridden so we can exit when window is closed this.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { dispose(); System.exit(0); } }); Container con=getContentPane(); con.setLayout(new GridLayout(5,5)); text=new JTextField(12); text.setHorizontalAlignment(JTextField.RIGHT); jpanel1=new JPanel(); jpanel1.setLayout(new GridLayout(1,1)); jpanel1.add(text); jpanel=new JPanel[4]; for(int i=0;i<4;i++) { jpanel[i]=new JPanel(); jpanel[i].setLayout(new GridLayout(1,5)); } jbutton=new JButton[name.length]; //add button to panel for(int j=0;j=0;i--) { con.add(jpanel[i]); } } public void actionPerformed(ActionEvent e) { for(int i=0;i<10;i++) { if(e.getActionCommand().equals(String.valueOf(i))) if(flag1==false) { text.setText(String.valueOf(i)); flag1=true; } else { text.setText(text.getText()+i); } } if(e.getActionCommand().equals(".")) if(flag2==false&&count==0) { text.setText(text.getText()+"."); count++; flag1=true; } if(e.getActionCommand().equals("+")||e.getActionCommand().equals("-")||e.getActionCommand().equals("*")||e.getActionCommand().equals("/")) { if(judge) { a=text.getText(); oper.EvaluateExpression(a); } else judge=true; flag1=false; flag2=false; count=0; if(e.getActionCommand().equals("+")) { a="+"; oper.EvaluateExpression(a); } if(e.getActionCommand().equals("-")) { a="-"; oper.EvaluateExpression(a); } if(e.getActionCommand().equals("*")) { a="*"; oper.EvaluateExpression(a); } if(e.getActionCommand().equals("/")) { a="/"; oper.EvaluateExpression(a); } } if(e.getActionCommand().equals("=")) { if(judge) { a=text.getText(); oper.EvaluateExpression(a); } else judge=true; oper.EvaluateExpression("#"); text.setText(""); text.setText(String.valueOf(oper.CalculateResult())); flag1=false; flag2=false; count=0; } if(e.getSource()==jbutton[2]) { text.setText("-"+text.getText()); } if(e.getActionCommand().equals(")")) { a=text.getText(); oper.EvaluateExpression(a); oper.EvaluateExpression(")"); judge=false; } if(e.getActionCommand().equals("CE")) { text.setText(""); judge=true; count=0; flag1=false; flag2=false; oper=new Operator(); } if(e.getActionCommand().equals("(")) { oper.EvaluateExpression("("); } } /** * Main method * * @param args String[] */ public static void main(String args[]) { Calculator Cmain=new Calculator(); Cmain.pack(); }}/** * Operator.java * Description:用栈实现计算 * Created on 2004年10月13日, 下午3:35 * @author jacktom*/public class Operator{ StackY optr; //存放操作符 StackY opnd;//存放操作数 Puzhu p; boolean Mark; Operator() { p=new Puzhu(); optr=new StackY(); opnd=new StackY(); optr.push("#"); } public void EvaluateExpression(String s) { boolean mark=true; if(s=="+"||s=="-"||s=="*"||s=="/"||s=="("||s==")"||s=="#") { while(mark) { switch(p.Precede(optr.peek(),s)) { case -1: optr.push(s); mark=false; break; case 0: optr.pop(); mark=false; break; case 1: String theta=optr.pop(); String a =opnd.pop(); String b =opnd.pop(); if(a.indexOf(".",0)==-1&&b.indexOf(".",0)==-1) Mark=true; else Mark=false; double c=Double.valueOf(a).doubleValue(); double d=Double.valueOf(b).doubleValue(); double e=p.Operate(c,theta,d); String f=String.valueOf(e); if(theta=="/") Mark=false; if(Mark) opnd.push(f.substring(0,f.indexOf(".",0))); else opnd.push(f); break; } } } else opnd.push(s); } public String CalculateResult() { //double result=Double.valueOf(opnd.peek()).doubleValue(); return opnd.peek(); }}/** * Description:判断操作符的优先级并计算结果 * Created on 2004年10月13日, 下午4:00 * @author jacktom*/class Puzhu{ public Puzhu() {} public int Precede(String optr1,String optr2) { String[] A={"+","-","*","/","(",")","#"}; int[][] B={ {1,1,-1,-1,-1,1,1}, {1,1,-1,-1,-1,1,1}, {1,1,1,1,-1,1,1}, {1,1,1,1,-1,1,1}, {-1,-1,-1,-1,-1,0,2}, {1,1,1,1,2,1,1}, {-1,-1,-1,-1,-1,2,0}, }; int i=0,j=0,k; while(i<7) { if(A[i]==optr1) { break; } i++; } while(j<7) { if(A[j]==optr2) { break; } j++; } k=B[i][j]; return k; } public double Operate(double a,String oper,double b) { double c=0; if(oper=="+") c=a+b; if(oper=="-") c=b-a; if(oper=="*") c=a*b; if(oper=="/") c=b/a; return c; }}/** * StackY.java * Description:堆栈的基本操作实现 * Created on 2004年10月13日, 下午3:05 * @author jacktom*/public class StackY { private int maxSize; // size of stack array private String[] stackArray; private int top; // top of stack public StackY(int s) // constructor { maxSize = s; // set array size stackArray = new String[maxSize]; // create array top = -1; // no items yet }public StackY() // constructor { maxSize = 20; // set array size stackArray = new String[maxSize]; // create array top = -1; // no items yet } public void push(String j) // put item on top of stack { top++; stackArray[top] = j; // increment top, insert item } public String pop() // take item from top of stack { return stackArray[top--]; // access item, decrement top } public String peek() // peek at top of stack { return stackArray[top]; } public boolean isEmpty() // true if stack is empty { return (top == 0); } }