java(12)异常处理

try

{

}

catch(SpecialException e)

{

}

catch(exception ee)

{

}

finally

{

}

 

package 异常处理;

public class YiChang5 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		try
		{
			int[] a = new int[5];
			a[5] = 6;
		}
		catch(ArrayIndexOutOfBoundsException e)
		{
			System.out.println("该程序发生了数组下标越界异常");
		}
		catch(Exception ee)
		{
			System.out.println("该程序发生了异常");
		}
		finally
		{
			System.out.println("该语句是肯定执行的");
		}
	}
}

 

import java.net.*;

import java.IO.*;

throws语句是在方法的声明中使用来抛出异常，throw语句是在方法体内使用抛出的异常

自定义异常

class 类名 extends Exception

{

public MyException()

{

}

public MyException(String s)

{

super(s);

}

}

自定义异常：

package 异常处理;

public class YiChang5 {
	public String deiFen(int fen) throws MyException
	{
		if(fen>=0&&fen<=100)
		{
			return "正常";
		}
		else
		{
			throw new MyException("错误输入");
		}
	}
	

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		YiChang5 yc = new YiChang5();
		try
		{
			String s = yc.deiFen(68);
			System.out.println(s);
			String ss = yc.deiFen(123);
			System.out.println(ss);
			
			
		}
		catch(ArrayIndexOutOfBoundsException e)
		{
			System.out.println("该程序发生了数组下标越界异常");
		}
		catch(MyException e)
		{
			System.out.println("异常信息为:" + e.getMessage());
		}
		catch(Exception ee)
		{
			System.out.println("该程序发生了异常");
		}
		finally
		{
			System.out.println("该语句是肯定执行的");
		}
	}
}