使用netbeans实现一个简易计算器

package javaapplication1;

public class 简易计算器 extends javax.swing.JFrame {

    /**

     * Creates new form 简易计算器

     */

    public 简易计算器() {

        initComponents();

    }

     public String result = "";

    public String flag = "";

     public double[] getNum(String result)

    {

        if(null==result||result.equals(""))

            return null;

        double[] dTmp = new double[2];

        int index1 = result.indexOf(flag.substring(0, 1));

        int index2 = result.indexOf(flag.substring(1,2));

        System.out.println(flag);

        dTmp[0] = Double.parseDouble(result.substring(0, index1));

        dTmp[1] = Double.parseDouble(result.substring(index1+1, index2));

   

        return dTmp;

    }                      

    private void jButton14ActionPerformed(java.awt.event.ActionEvent evt) {                                         

        // TODO add your handling code here:

         result = result+"+";

        jTextField1.setText(result);

        flag = flag+ "+";

    }                                        

    private void jButton7ActionPerformed(java.awt.event.ActionEvent evt) {                                        

        // TODO add your handling code here:

        result = result+"5";

        jTextField1.setText(result);

    }                                       

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                        

        // TODO add your handling code here:

        result = result+"1";

        jTextField1.setText(result);

    }                                       

    private void jButton12ActionPerformed(java.awt.event.ActionEvent evt) {                                         

        // TODO add your handling code here:

        result = result+"2";

        jTextField1.setText(result);

    }                                        

    private void jButton8ActionPerformed(java.awt.event.ActionEvent evt) {                                        

        // TODO add your handling code here:

        result = result+"3";

        jTextField1.setText(result);

    }                                       

    private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {                                        

        // TODO add your handling code here:

        result = result+"4";

        jTextField1.setText(result);

    }                                       

    private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {                                        

        // TODO add your handling code here:

        result = result+"6";

        jTextField1.setText(result);

    }                                       

    private void jButton9ActionPerformed(java.awt.event.ActionEvent evt) {                                        

        // TODO add your handling code here:

        result = result+"7";

        jTextField1.setText(result);

    }                                       

    private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {                                        

        // TODO add your handling code here:

        result = result+"8";

        jTextField1.setText(result);

    }                                       

    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                        

        // TODO add your handling code here:

        result = result+"9";

        jTextField1.setText(result);

    }                                       

    private void jButton10ActionPerformed(java.awt.event.ActionEvent evt) {                                         

        // TODO add your handling code here:

        result = result+"0";

        jTextField1.setText(result);

    }                                        

    private void jButton15ActionPerformed(java.awt.event.ActionEvent evt) {                                         

        // TODO add your handling code here:

        result = result+"-";

        jTextField1.setText(result);

        flag = flag+ "-";

    }                                        

    private void jButton16ActionPerformed(java.awt.event.ActionEvent evt) {                                         

        // TODO add your handling code here:

        result = result+"*";

        jTextField1.setText(result);

        flag = flag+ "*";

    }                                        

    private void jButton13ActionPerformed(java.awt.event.ActionEvent evt) {                                         

        // TODO add your handling code here:

        result = result+"/";

        jTextField1.setText(result);

        flag = flag+ "/";

    }                                        

    private void jButton11ActionPerformed(java.awt.event.ActionEvent evt) {                                         

        // TODO add your handling code here:

         result = result+"=";

        jTextField1.setText(result);

        flag = flag+ "=";

        double num1 = 0.0;

        double num2 = 0.0;

        double num3 =0.0;

        double dTmp[] = getNum(result);

        num1 = dTmp[0];

        num2 = dTmp[1];

        System.out.println("num1="+num1+"num2="+num2);

        switch(result.charAt(1))

        {

            case '+':

            {

                num3 = num1+num2;

                break;

            }

            case '-':

            {

                num3 = num1-num2;

                break;

            }

            case '*':

            {

                num3 = num1*num2;

                break;

            }<
4000
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            case '/':

            {

                num3 = num1/num2;

                break;

            }

        }

        result = result+num3;

        jTextField1.setText(result);

       

       

    }                                        

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                        

        // TODO add your handling code here:

        jTextField1.setText("");

        result="";

        flag="";

    }   

    public static void main(String args[]) {

        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {

                new 简易计算器().setVisible(true);

            }

        });

    }