链式异常的优势是什么

任何人都可以提供关于是否需要连锁例外的信息？

文章说得非常好：

异常链接允许您将一种异常类型映射到另一种异常类型，以便方法可以引发在与方法本身相同的抽象级别定义的异常，而不会丢弃重要的调试信息。

也就是说，如果您有一个从数据库中加载某些对象的方法，您可能更希望一些（与方法抽象级别更相关）而不是低级，即使这是问题的原始根源。但是，如果您只是简单地捕获并抛出一个，则可能会丢失重要的调试信息。ResourceLoadExceptionSQLExceptionSQLExceptionResourceLoadException

因此，链接异常是一个很好的选择。您抛出一个非常适合特定方法的“高级”异常，但将其与导致它的异常链接在一起。

否则，程序员可以在同一代码中捕获两个异常，而不必抛出一个新的Sruntable实例？

我不太遵循你的推理。关键是他不应该担心在这个抽象的层面上。SQLException

为什么链例外？

我们需要链接异常以使日志可读。

以以下 1 为例。没有链接和2。链接，异常感受差异

创建以下例外

    class NoLeaveGrantedException extends Exception {

        public NoLeaveGrantedException(String message, Throwable cause) {
            super(message, cause);
        }

        public NoLeaveGrantedException(String message) {
            super(message);
        }
    }

    class TeamLeadUpsetException extends Exception {

        public TeamLeadUpsetException(String message, Throwable cause) {
            super(message, cause);
        }

        public TeamLeadUpsetException(String message) {
            super(message);
        }
    }

    class ManagerUpsetException extends Exception {

        public ManagerUpsetException(String message, Throwable cause) {
            super(message, cause);
        }

        public ManagerUpsetException(String message) {
            super(message);
        }
    }

    class GirlFriendOfManagerUpsetException extends Exception {

        public GirlFriendOfManagerUpsetException(String message, Throwable cause) {
            super(message, cause);
        }

        public GirlFriendOfManagerUpsetException(String message) {
            super(message);
        }
    }

现在使用它们

1. 无链

    public class MainClass {

        public static void main(String[] args) throws Exception {
            getLeave();
        }

        static void getLeave() throws NoLeaveGrantedException {
            try {
                howIsTeamLead();
            } catch (TeamLeadUpsetException e) {
                e.printStackTrace();
                throw new NoLeaveGrantedException("Leave not sanctioned.");
            }
        }

        static void howIsTeamLead() throws TeamLeadUpsetException {
            try {
                howIsManager();
            } catch (ManagerUpsetException e) {
                e.printStackTrace();
                throw new TeamLeadUpsetException(
                            "Team lead is not in good mood");
            }
        }

        static void howIsManager() throws ManagerUpsetException {
            try {
                howIsGirlFriendOfManager();
            } catch (GirlFriendOfManagerUpsetException e) {
                e.printStackTrace();
                throw new ManagerUpsetException("Manager is in bad mood");
            }

        }

        static void howIsGirlFriendOfManager() 
             throws GirlFriendOfManagerUpsetException {
            throw new GirlFriendOfManagerUpsetException(
             "Girl friend of manager is in bad mood");
        }
    }

2. 链接

    public class MainClass {

        public static void main(String[] args) throws Exception {
            getLeave();
        }

        static void getLeave() throws NoLeaveGrantedException {
            try {
                howIsTeamLead();
            } catch (TeamLeadUpsetException e) {
                throw new NoLeaveGrantedException("Leave not sanctioned.", e);
            }
        }

        static void howIsTeamLead() throws TeamLeadUpsetException {
            try {
                howIsManager();
            } catch (ManagerUpsetException e) {
                throw new TeamLeadUpsetException(
                           "Team lead is not in good mood", e);
            }
        }

        static void howIsManager() throws ManagerUpsetException {
            try {
                howIsGirlFriendOfManager();
            } catch (GirlFriendOfManagerUpsetException e) {
                throw new ManagerUpsetException("Manager is in bad mood", e);
            }

        }

        static void howIsGirlFriendOfManager() 
           throws GirlFriendOfManagerUpsetException {
            throw new GirlFriendOfManagerUpsetException(
              "Girl friend of manager is in bad mood");
        }
    }

现在比较日志

1. 无链

    com.bskyb.svod.autoingest.GirlFriendOfManagerUpsetException: Girl friend of manager is in bad mood
        at com.bskyb.svod.autoingest.MainClass.howIsGirlFriendOfManager(MainClass.java:61)
        at com.bskyb.svod.autoingest.MainClass.howIsManager(MainClass.java:52)
        at com.bskyb.svod.autoingest.MainClass.howIsTeamLead(MainClass.java:43)
        at com.bskyb.svod.autoingest.MainClass.getLeave(MainClass.java:34)
        at com.bskyb.svod.autoingest.MainClass.main(MainClass.java:29)
    com.bskyb.svod.autoingest.ManagerUpsetException: Manager is in bad mood
        at com.bskyb.svod.autoingest.MainClass.howIsManager(MainClass.java:55)
        at com.bskyb.svod.autoingest.MainClass.howIsTeamLead(MainClass.java:43)
        at com.bskyb.svod.autoingest.MainClass.getLeave(MainClass.java:34)
        at com.bskyb.svod.autoingest.MainClass.main(MainClass.java:29)
    com.bskyb.svod.autoingest.TeamLeadUpsetException: Team lead is not in good mood
        at com.bskyb.svod.autoingest.MainClass.howIsTeamLead(MainClass.java:46)
        at com.bskyb.svod.autoingest.MainClass.getLeave(MainClass.java:34)
        at com.bskyb.svod.autoingest.MainClass.main(MainClass.java:29)
    Exception in thread "main" com.bskyb.svod.autoingest.NoLeaveGrantedException: Leave not sanctioned.
        at com.bskyb.svod.autoingest.MainClass.getLeave(MainClass.java:37)
        at com.bskyb.svod.autoingest.MainClass.main(MainClass.java:29)

2. 链接

    Exception in thread "main" com.bskyb.svod.autoingest.NoLeaveGrantedException: Leave not sanctioned.
        at com.bskyb.svod.autoingest.MainClass.getLeave(MainClass.java:36)
        at com.bskyb.svod.autoingest.MainClass.main(MainClass.java:29)
    Caused by: com.bskyb.svod.autoingest.TeamLeadUpsetException: Team lead is not in good mood
        at com.bskyb.svod.autoingest.MainClass.howIsTeamLead(MainClass.java:44)
        at com.bskyb.svod.autoingest.MainClass.getLeave(MainClass.java:34)
        ... 1 more
    Caused by: com.bskyb.svod.autoingest.ManagerUpsetException: Manager is in bad mood
        at com.bskyb.svod.autoingest.MainClass.howIsManager(MainClass.java:52)
        at com.bskyb.svod.autoingest.MainClass.howIsTeamLead(MainClass.java:42)
        ... 2 more
    Caused by: com.bskyb.svod.autoingest.GirlFriendOfManagerUpsetException: Girl friend of manager is in bad mood
        at com.bskyb.svod.autoingest.MainClass.howIsGirlFriendOfManager(MainClass.java:58)
        at com.bskyb.svod.autoingest.MainClass.howIsManager(MainClass.java:50)
        ... 3 more