Java-手动抛出异常

• 关于异常对象的产生
  • 系统自动生成的异常对象
  • 手动生成一个异常对象，并抛出（throw）

package p8exception.p9;

public class StudentTest {
    public static void main(String[] args) {
        Student s = new Student();
        try {
            s.regist(-1001);
            System.out.println(s);
        } catch (Exception e) {
            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("非法");
//            throw new RuntimeException("输入非法");
            throw new Exception("输入非法");
        }

    }

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