计算器！！！

[java]代码库
//创建页面Calframe.class
package calframe;
 
 
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.util.Arrays;
 
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class CalFrame extends JFrame{
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
     /**
      * design for the face of cal
      */
    private final static int PRE_WIDTH=500;
    private final static int PRE_HEIGHT=400;
    private JTextField text=null;
    private JButton button=null;   //storage mark
    private String[] nOp={"7","8","9","/","sqrt","4","5","6","*","%","1","2","3","-","1/x","0","+/-",".","+","="};
    private String[] mOp={"MC","MR","MS","M+"};
    private String[] rOp={"Back","CE","C"};
    private CalService service= new CalService();
     
    public CalFrame(){
        this.setTitle("Calculation");
        this.setSize(PRE_WIDTH,PRE_HEIGHT);
        this.setLocationRelativeTo(null);
        this.setResizable(false);
        // add bottom
        JPanel panel=new JPanel();
        panel.setLayout(new BorderLayout(10,1));
        panel.add(getTextField(), BorderLayout.NORTH);
        panel.setPreferredSize(new Dimension(PRE_WIDTH,PRE_HEIGHT));
         
        //WEST
        JButton[] mBtn=getMButton();
        JPanel panel1=new JPanel();
        panel1.setLayout(new GridLayout(5,1,0,5));
        for(JButton b:mBtn){
            panel1.add(b);
        }
        panel.add(panel1, BorderLayout.WEST);
        //
        JButton[] rBtn=getRButton();
        JPanel panel2=new JPanel();
        panel2.setLayout(new BorderLayout(1,5));
        JPanel panel21=new JPanel();
        panel21.setLayout(new GridLayout(1,3,3,3));
        for(JButton b:rBtn){
            panel21.add(b);
        }
        panel2.add(panel21, BorderLayout.NORTH);
        JButton[] nBtn=getNButton();
        JPanel panel22=new JPanel();
        panel22.setLayout(new GridLayout(4,5,3,5));
        for(JButton b:nBtn){
            panel22.add(b);
        }
        panel2.add(panel22,BorderLayout.CENTER);
        panel.add(panel2, BorderLayout.CENTER);
        this.add(panel);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setVisible(true);
    }
 
    private JButton[] getRButton() {
        // TODO Auto-generated method stub
        JButton[] rBtn=new JButton[rOp.length];
        for(int i=0;i<this.rOp.length;i++){
            JButton b=new JButton(this.rOp[i]);
            b.addActionListener(getActionListener());
            b.setForeground(Color.red);
            rBtn[i]=b;
        }
        return rBtn;
    }
    //return data Btn
    private JButton[] getNButton() {
        // TODO Auto-generated method stub
        String[] redBtn={"/","*","-","+","="};
        JButton[] nbutton=new JButton[nOp.length];
        for(int i=0;i<this.nOp.length;i++){
            JButton b = new JButton(this.nOp[i]);
            b.addActionListener(getActionListener());
            Arrays.sort(redBtn);
            if(Arrays.binarySearch(redBtn, nOp[i])>=0){
                b.setForeground(Color.red);
            }else{
                b.setForeground(Color.blue);
            }
            nbutton[i]=b;
        }
        return nbutton;
    }
 
    private ActionListener getActionListener() {
        // TODO Auto-generated method stub
        ActionListener actionListener = new ActionListener(){
            public void actionPerformed(ActionEvent e){
                   String cmd=e.getActionCommand();
                   String result=null;
                   try{
                       result=service.callMethod(cmd,text.getText());
                   }catch(Exception e2){
                       System.out.println(e2.getMessage());
                   }
                   if(cmd.indexOf("MC")==0){
                       button.setText("");
                   }else if(cmd.indexOf("M")==0){
                       button.setText("M");
                   }
                   //show the calculate result
                   if(result!=null){
                       text.setText(result);
                   }
            }
        };
        return actionListener;
    }
 
    private JButton[] getMButton() {
        // TODO Auto-generated method stub
        JButton[] mBtn=new JButton[mOp.length+1];
        mBtn[0]=getButton();
        for(int i=0;i<this.mOp.length;i++){
            JButton b=new JButton(this.mOp[i]);
            b.addActionListener(getActionListener());
            b.setForeground(Color.red);
            mBtn[i+1] = b;
        }
        return mBtn;
    }
     
    private JButton getButton() {
        // TODO Auto-generated method stub
        button=new JButton();
        return button;
    }
 
    //return show 
    private JTextField getTextField() {
        // TODO Auto-generated method stub
        text = new JTextField("0",10);
        return text;
    }
    public static void main(String[] args){
        new CalFrame();
    }
}
 
public class CalService {
     
    private boolean isSecondNum=false;
    private String lastOp;
    private String firstNum="0";
    private String secondNum="null";
    private double store;
    private String numString = "0123456789.";
    private String opString="+-*/";
     
    public String catNum(String cmd,String text){
         
        String result = cmd;
        if(!"0".equals(text)){
            if(isSecondNum){
                isSecondNum=false;
            }else{
                result = text + cmd;
            }
        }
        if(result.indexOf(".")==0){
            result = "0" + result;
        }
         
        return result;
    }
    public String setOp(String cmd,String text){
        this.lastOp = cmd;
        this.firstNum=text;
        this.secondNum=null;
        this.isSecondNum=true;
        return null;
    }
    public String cal(String text,boolean isPercent){
        double secondResult = secondNum==null?Double.valueOf(text).doubleValue():Double.valueOf(secondNum).doubleValue();
        // chushu is zero
        if(secondResult == 0 && this.lastOp.equals("/")){
            return "0";
        }
        //hava "%"
        if(isPercent){
            secondResult = MyMath.multiply(Double.valueOf(firstNum),(double) MyMath.divide(secondResult,100.000));
        }
        if(this.lastOp.equals("+")){
            firstNum=String.valueOf(MyMath.add(Double.valueOf(firstNum),secondResult));
        }else if(this.lastOp.equals("-")){
            firstNum=String.valueOf(MyMath.subtract(Double.valueOf(firstNum),secondResult));
        }else if(this.lastOp.equals("*")){
            firstNum=String.valueOf(MyMath.multiply(Double.valueOf(firstNum),secondResult));
        }else if(this.lastOp.equals("/")){
            firstNum=String.valueOf(MyMath.divide(Double.valueOf(firstNum),secondResult));
        }
        secondNum=secondNum==null?text:secondNum;
        this.isSecondNum=true;
        return firstNum;
    }
     
    // sqrt
    public String sqrt(String text){
        this.isSecondNum = true;
        return String.valueOf(Math.sqrt(Double.valueOf(text)));
    }
    // qiu daoshu
    public String setReciprocal(String text){
        if(text.equals("0")){
            return text;
        }else {
            this.isSecondNum = true;
            return String.valueOf(MyMath.divide(1, Double.valueOf(text)));
        }
    }
     
    //storage
    public String mCmd(String cmd,String text){
        if(cmd.equals("M+")){
            store=MyMath.add(store, Double.valueOf(text));
        }else if(cmd.equals("MC")){
            store=0;
        }else if(cmd.equals("MR")){
            isSecondNum=true;
            return String.valueOf(store);
        }else if(cmd.equals("MS")){
            store = Double.valueOf(text).doubleValue();
        }
        return null;
    }
     
     
     
    public String setNegative(String text){
        if(text.indexOf("-")==0){
            return text.substring(1, text.length());
        }else {
            return "-" + text;
        }
    }
    public String clear(String text){
        return "0";
    }
    public String clearAll(){
        this.firstNum="0";
        this.secondNum=null;
        return this.firstNum;
    }
    public String backSpace(String text){
        return text.equals("0") || text.equals("")?"0":text.substring(0,text.length()-1);
    }
    public String callMethod(String cmd, String text) {
        // TODO Auto-generated method stub
        if(cmd.equals("C")){
            return clearAll();
        }else if(cmd.equals("CE")){
            return clear(text);
        }else if(cmd.equals("Back")){
            return backSpace(text);
        }else if(numString.indexOf(cmd) != -1){
            return catNum(cmd,text);
        }else if(opString.indexOf(cmd) != -1){
            return setOp(cmd,text);
        }else if(cmd.equals("+/-")){
            return setNegative(text);
        }else if(cmd.equals("1/x")){
            return setReciprocal(text);
        }else if(cmd.equals("sqrt")){
            return sqrt(text);
        }else if(cmd.equals("%")){
            return cal(text,true);
        }else if(cmd.equals("=")){
            return cal(text,false);
        }else{
            return mCmd(cmd,text);
        }
    }
 
}
 
 
 
 
 
 
 
 
//  计算
 
 
import java.math.BigDecimal;
 
public class MyMath {
    /**
     * Double for BigDecimal
     * @param secondResult
     * @param double1
     * @return
     */
    private static BigDecimal getBigDecimal(final double number){
        return new BigDecimal(number);
    }
 
    public static Object divide(double num1, double num2) {
        // TODO Auto-generated method stub
        BigDecimal first=getBigDecimal(num1);
        BigDecimal second = getBigDecimal(num2);
        return first.divide(second, 3, BigDecimal.ROUND_HALF_UP).doubleValue();
    }
 
    public static double multiply(double num1, double num2) {
        // TODO Auto-generated method stub
        BigDecimal first=getBigDecimal(num1);
        BigDecimal second = getBigDecimal(num2);
        return first.multiply(second).doubleValue();
    }
 
    public static double add(double num1, double num2) {
        // TODO Auto-generated method stub
        BigDecimal first=getBigDecimal(num1);
        BigDecimal second = getBigDecimal(num2);
        return first.add(second).doubleValue();
    }
 
    public static double subtract(double num1, double num2) {
        // TODO Auto-generated method stub
        BigDecimal first=getBigDecimal(num1);
        BigDecimal second = getBigDecimal(num2);
        return first.subtract(second).doubleValue();
    }
 
 
}
用户注册

用户登录

发表随想

该用户最新代码

编程随想

[java]代码库

网友评论 (发表评论)

回复评论

回复评论

发表评论：

评论须知：

扫码下载

输入口令后可复制整站源码
