package top.qaqaq.java.P382;
/*
 * 如何自定义异常类？
 * 1. 继承于现有的异常结构：RuntimeException、Exception
 * 2. 提供全局常量：serialVersionUID
 * 3. 提供重载的构造器
 * 
 */
public class MyException extends Exception {
	
	static final long serialVersionUID = -7034897132712766939L;
	
	public MyException() {
		
	}
	
	public MyException(String msg) {
		super(msg);
	}
	
	

}

package top.qaqaq.java.P382;

public class StudentTest {

	public static void main(String[] args) {
		
		try {
			Student s = new Student();
			s.regist(-1001);
			System.out.println(s);
		} catch (Exception e) {
//			e.printStackTrace();
			System.out.println(e.getMessage());
		}
	}
}

class Student{
	
	private int id;
	
	public void regist(int id) throws Exception{
		
		if(id > 0) {
			this.id = id;
		}else {
//			System.out.println("您输入的数据非法！");
			//手动抛出异常对象
//			throw new RuntimeException("您输入的数据非法！");
			throw new MyException("不能输入负数");
			//错误的
//			throw new String("不能输入负数");
		}
	}

	@Override
	public String toString() {
		return "Student [id=" + id + "]";
	}
}