Java计算器(包括源码）

package lessoin17_1; import java.awt.Color; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.EmptyStackException; import java.util.Stack; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JPanel; public class IntexPanel extends JPanel implements ActionListener{ public static String result = ""; private JButton btn[] = new JButton[20]; public final static Color colorlightblue=new Color(240,240,230); Color c = Color.white; public IntexPanel(){ this.setLayout(new GridLayout(4,5)); String s[] = new String[]{"7","8","9","/","sqrt","4","5","6","*","%", "1","2","3","-","1/x","0","+/-",".","+","="}; for(int i=0;i<s.length;i++){ btn[i] = new JButton(s[i]); } for(int i=0;i<s.length;i++){ btn[i].setBorder(BorderFactory.createMatteBorder(6, 6, 6, 6, colorlightblue)); } Color cc = new Color(160,50,50); for(int i = 0; i<=2;i++){ btn[i].setForeground(Color.BLUE); } for(int i =4;i<=7;i++){ btn[i].setForeground(Color.BLUE); } for(int i = 9;i<=12;i++){ btn[i].setForeground(Color.BLUE); } for(int i = 14;i<=17;i++){ btn[i].setForeground(Color.BLUE); } btn[3].setForeground(cc); btn[8].setForeground(cc); btn[13].setForeground(cc); btn[18].setForeground(cc); btn[19].setForeground(cc); for(int i=0;i<btn.length;i++){ btn[i].addActionListener(this); } for(int i=0;i<btn.length;i++){ this.add(btn[i]); } } public void actionPerformed(ActionEvent e) { boolean onePush = true; if(e.getSource() == btn[0]){ result+="7"; Calculator.txtFld.setText(result); } else if(e.getSource() == btn[1]){ result+="8"; Calculator.txtFld.setText(result); } else if(e.getSource() == btn[2]){ result+="9"; Calculator.txtFld.setText(result); } else if(e.getSource() == btn[5]){ result+="4"; Calculator.txtFld.setText(result); } else if(e.getSource() == btn[6]){ result+="5"; Calculator.txtFld.setText(result); } else if(e.getSource() == btn[7]){ result+="6"; Calculator.txtFld.setText(result); } else if(e.getSource() == btn[10]){ result+="1"; Calculator.txtFld.setText(result); } else if(e.getSource() == btn[11]){ result+="2"; Calculator.txtFld.setText(result); } else if(e.getSource() == btn[12]){ result+="3"; Calculator.txtFld.setText(result); } else if(e.getSource() == btn[17]){ result+="."; Calculator.txtFld.setText(result); } if(e.getSource() == btn[18]) { result+="+"; Calculator.txtFld.setText(result); }else if(e.getSource() == btn[13]) { result+="-"; Calculator.txtFld.setText(result); }else if(e.getSource() == btn[8]) { result+="*"; Calculator.txtFld.setText(result); }else if(e.getSource() == btn[3]) { result+="/"; Calculator.txtFld.setText(result); }else if(e.getSource() == btn[19]) { Calculator.txtFld.setText(String.valueOf(CountRes(result))); } } public double CountRes(String str) { int i = 0, j = 0, k; char c; StringBuffer s = new StringBuffer(); s.append(str); s.append('='); String formula = s.toString(); char[] anArray; anArray = new char[50]; Stack<Character> mystack = new Stack<Character>(); while (formula.charAt(i) != '=') { c = formula.charAt(i); switch (c) { case '+': case '-': while (!mystack.empty()) { anArray[j++] = mystack.pop().charValue(); } mystack.push(new Character(c)); i++; break; case '*': case '/': while (!mystack.empty() && (mystack.peek().charValue() == '*' || mystack.peek() .charValue() == '/')) { anArray[j++] = mystack.pop().charValue(); } mystack.push(new Character(c)); i++; break; case ' ': i++; break; default: while ((c >= '0' && c <= '9') || c == '.') { anArray[j++] = c; i++; c = formula.charAt(i); } anArray[j++] = '#'; break; } } while (!(mystack.empty())) anArray[j++] = mystack.pop().charValue(); i = 0; int count; double a, b, d; Stack<Double> mystack1 = new Stack<Double>(); while (i < j) { c = anArray[i]; switch (c) { case '+': a = mystack1.pop().doubleValue(); b = mystack1.pop().doubleValue(); d = b + a; mystack1.push(new Double(d)); i++; break; case '-': a = mystack1.pop().doubleValue(); b = mystack1.pop().doubleValue(); d = b - a; mystack1.push(new Double(d)); i++; break; case '*': a = mystack1.pop().doubleValue(); b = mystack1.pop().doubleValue(); d = b * a; mystack1.push(new Double(d)); i++; break; case '/': a = mystack1.pop().doubleValue(); b = mystack1.pop().doubleValue(); if (a != 0) { d = b / a; mystack1.push(new Double(d)); i++; } else { System.out.println("除数不能为零!"); } break; default: d = 0; count = 0; while ((c >= '0' && c <= '9')) { d = 10 * d + c - '0'; i++; c = anArray[i]; } if (c == '.') { i++; c = anArray[i]; while ((c >= '0' && c <= '9')) { count++; d = d + (c - '0') / Math.pow(10, count); i++; c = anArray[i]; } } if (c == '#') mystack1.push(new Double(d)); i++; break; } } return (mystack1.peek().doubleValue()); } /* private void leftFld(JButton button,boolean onePush){ if(onePush&&tag){ tag = false; String str = button.getText()+ Calculator.txtFld.getText(); int locate = str.lastIndexOf('0'); Calculator.txtFld.setText(str.substring(0,locate)+'.'); } else{ String str = Calculator.txtFld.getText(); int pointLoc = Calculator.txtFld.getText().indexOf('.'); Calculator.txtFld.setText(str.substring(0,pointLoc).concat(button.getText()+'.')); } }*/ }