Java異常處理-手動拋出異常

/**
 * 手動拋出異常
 * throw
 *
 * @author orz
 */
public class ThrowTest {

}
class Student{
    private int id;
    public void regist(int id)
    {
        if(id>0)
        {
            this.id=id;

        }
        else
        {
            throw new RuntimeException("不能為負數");
        }
    }

    public static void main(String[] args) {
        Student s=new Student();
        s.regist(-1);
    }
}