[异常概念](%E5%BC%82%E5%B8%B8%E6%A6%82%E5%BF%B5.md) [throw 关键字](throw%E5%85%B3%E9%94%AE%E5%AD%97.md) [java - Objects.requireNonNull](java-Objects.requireNonNull.md) [throws 关键字(异常处理第一种方法)](throws%E5%85%B3%E9%94%AE%E5%AD%97.md) [try-catch（异常处理第二种方法）](try-catch%EF%BC%88%E5%BC%82%E5%B8%B8%E5%A4%84%E7%90%86%E7%AC%AC%E4%BA%8C%E7%A7%8D%E6%96%B9%E6%B3%95%EF%BC%89.md) [finally 使用注意](finally%E4%BD%BF%E7%94%A8%E6%B3%A8%E6%84%8F.md) [自定义异常类](%E8%87%AA%E5%AE%9A%E4%B9%89%E5%BC%82%E5%B8%B8%E7%B1%BB.md)