import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class ExceptionApplet extends Applet implements ActionListener
{   Label L1,L2;
    TextField tf1,tf2;
    String answerStr;
    double d1,d2;

    public void init( )
    {   L1=new Label("請(qǐng)輸入0到100之間的整數(shù)");
        add(L1);
        tf1=new TextField(6);
        add(tf1);
        tf2=new TextField(6);
        add(tf2);
        L2=new Label("兩數(shù)相除的結(jié)果：                                                  ");
        add(L2);
        tf1.addActionListener(this);
        tf2.addActionListener(this);
    }
    public void actionPerformed(ActionEvent evt)
    {   try
        {   d1=Double.valueOf(tf1.getText( )).doubleValue( );
            d2=Double.valueOf(tf2.getText( )).doubleValue( );
            // valueOf(String s) 可能拋出異常 NumberFormatException
            L2.setText("兩數(shù)相除的結(jié)果：   "+Result( ));
            // 調(diào)用 Result( ) 方法可能拋出 NumberRangeException 異常
        }
        catch(NumberFormatException e)
        {   answerStr="輸入的必須是數(shù)字";
            L2.setText(answerStr);
        }
        catch(NumberRangeException ee)
        {   answerStr=ee.getMessage( );
            L2.setText(answerStr);
        }
        repaint( );
    }
    public double Result( ) throws NumberRangeException
    {   double answer=0;
        try
        {   if((d1<0)||(d2<0)||(d1>100)||(d2>100))
            {   NumberRangeException ee=new NumberRangeException("輸入的數(shù)字不在指定的范圍！請(qǐng)重新輸入。");
                throw ee;
            }
            answer=d1/d2;
        }
        catch(ArithmeticException eee)
        {   answerStr=eee.toString( );
        }
        return answer;
    }
}
class NumberRangeException extends Exception
{   NumberRangeException(String msg)
    {   super(msg);   }
    //子類調(diào)用父類的帶參數(shù)的構(gòu)造函數(shù)
}