编写一个java application实现如下功能用户通过输入对话框先后输入2个double型数据

被除数和除数，做除法运算后消息对话框输出结果。要求除数不能为负数，为此要自定义一个异常类DivideByMinusException（表除数为负数的异常），当除数为负数时提示用户重新输入，并处理NumberFormatException。哪位大神帮忙下应该使用JAVA异常处理try。。catch来做求解

import java.awt.BorderLayout;
import java.awt.GridLayout;

import javax.swing.*;

import org.springframework.core.NestedRuntimeException;


public class DivisorFrame extends javax.swing.JFrame {

private javax.swing.JTextField divisor;
private javax.swing.JTextField dividend;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JButton sureBtn;

public DivisorFrame(String title) {
super(title);
//初始化
initComponents();
}

private void initComponents() {

JPanel p1 = new JPanel();
JPanel p2 = new JPanel();

jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
divisor = new javax.swing.JTextField();
dividend = new javax.swing.JTextField();
sureBtn = new javax.swing.JButton();

jLabel1.setText("除数：");
jLabel2.setText("被除数：");

sureBtn.setText("确定");
sureBtn.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
divid(evt);
}
});

this.setLayout(new BorderLayout());
p1.setLayout(new GridLayout(2,2));
p1.add(jLabel1);
p1.add(divisor);
p1.add(jLabel2);
p1.add(dividend);

this.add(p1,BorderLayout.NORTH);
p2.add(sureBtn,BorderLayout.CENTER);
this.add(p2,BorderLayout.CENTER);

this.setSize(600,400);
this.setVisible(true);

pack();
}// </editor-fold>
//GEN-END:initComponents


private void divid(java.awt.event.ActionEvent evt) {
double d_divisor = 0;
double d_dividend = 0;
if(divisor.getText().equals("")){
JOptionPane.showMessageDialog(this, "被除数不能为空", "系统提示", JOptionPane.WARNING_MESSAGE);
divisor.requestFocus();
return;
}
if(dividend.getText().equals("")){
JOptionPane.showMessageDialog(this, "除数不能为空", "系统提示", JOptionPane.WARNING_MESSAGE);
divisor.requestFocus();
return;
}
try {
d_divisor = Double.parseDouble(divisor.getText());
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(this, "数据转换异常，请填写数值型数据", "系统提示", JOptionPane.WARNING_MESSAGE);
divisor.setText("");
divisor.requestFocus();
return;
}
try {
d_dividend = Double.parseDouble(dividend.getText());
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(this, "数据转换异常，请填写数值型数据", "系统提示", JOptionPane.WARNING_MESSAGE);
dividend.setText("");
dividend.requestFocus();
return;
}
try {
if(d_divisor <0){
divisor.setText("");
divisor.requestFocus();
JOptionPane.showMessageDialog(this, "除数不能为负数,请重新输入除数", "系统提示", JOptionPane.WARNING_MESSAGE);
throw new DivideByMinusException("除数不能为负数！");
}
double result = d_divisor / d_dividend;
JOptionPane.showMessageDialog(this, d_divisor + " / " + d_dividend + " = " + result, "计算结果", JOptionPane.WARNING_MESSAGE);
} catch (NumberFormatException e) {
JOptionPane.showMessageDialog(this, "数据转换异常，请填写数值型数据", "系统提示", JOptionPane.WARNING_MESSAGE);
dividend.requestFocus();
}
}

class DivideByMinusException extends NestedRuntimeException {

public DivideByMinusException(String msg) {
super(msg);
}
}

public static void main(String [] args){


DivisorFrame df = new DivisorFrame("除法运算，异常处理");
}
}

import javax.swing.*; class Test { public static double divide(double d1,double d2) throws DivideByMinusException { if(d2<0) throw new DivideByMinusException("Divisor can't be minus"); if(d2==0) throw new NumberFormatException("divide by zero"); return d1/d2; } public static void main(String[] args) { String str1=JOptionPane.showInputDialog("请输入被除数"); String str2=JOptionPane.showInputDialog("请输入除数"); double num1=Double.parseDouble(str1); double num2=Double.parseDouble(str2); try { double num3=divide(num1,num2); System.out.println(num3); System.exit(0); } catch (Exception e) { e.printStackTrace(); System.exit(0); } } } class DivideByMinusException extends Exception { private static final long serialVersionUID = 1L; public DivideByMinusException(String str) { super(str); } }

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