异常(Exception)

1. 概念

An exception is an event, which occurs during the execution of a program, that disrupts the normal flow of the program's instructions.

异常是在程序执行期间发生的事件，该事件中断了程序指令的正常流程。

When an error occurs within a method, the method creates an object and hands it off to the runtime system. The object, called an exception object, contains information about the error, including its type and the state of the program when the error occurred. Creating an exception object and handing it to the runtime system is called throwing an exception.

当方法内发生错误时，该方法将创建一个对象并将其交给运行时系统。 该对象称为异常对象，包含有关错误的信息，包括错误的类型和发生错误时程序的状态。创建异常对象并将其交给运行时系统称为抛出异常。

异常是由方法抛出

示例

package com . we . exception ;

public class Example1 {

        public static void main ( String [] args ) {

                calculate ();

        }

        public static void calculate (){

                int result = 1 / 0 ;

                System . out . println ( result ); // 该行代码不能够被执行

        }

}

2. 异常体系

Throwable

public Throwable ();

public Throwable ( String message );

public String getMessage (); // 获取异常发生的原因

public void printStackTrace (); // 打印异常在栈中的轨迹信息

Error

Exception

RuntimeException

检查异常

Java SE文章参考:Java SE入门及基础知识合集-CSDN博客