Java中自定义异常类_异常处理

 [总结]

 1.自定义异常:

 class 异常类名 extends Exception
 {
     public 异常类名(String msg)
     {
         super(msg);
     }
 }

 2.标识可能抛出的异常:

 throws 异常类名1,异常类名2

 3.捕获异常:
 try{}
 catch(异常类名 y){}
 catch(异常类名 y){}

 4.方法解释
 getMessage() //输出异常的信息
 printStackTrace() //输出导致异常更为详细的信息
 package 作业0918;

public class ByteSizeException extends Exception {

	public ByteSizeException(String string) {
		super(string);

	}

}


 /**
 * 
 */
package 作业0918;

import java.util.Scanner;

public class ByteSizeExceptionTest {

	public static void main(String[] args) throws ByteSizeException {
		try {
			ByteSizeExceptionTest.tt();
		} catch (ByteSizeException e) {
			// TODO: handle exception
			System.out.println("超出范围啦");
			e.printStackTrace();
		}

	}

	public static void tt() throws ByteSizeException {
		Scanner scanner = new Scanner(System.in);
		int s = scanner.nextInt();
		if (s < -128 || s > 127) {
			throw new ByteSizeException("输入的值必须是-128到127之间");
		}
	}
}