java - 为什么有些 Java 异常可以不处理？

Question

    public static void main(String[] args) {
    File file = new File("foobar"); 
    file.createNewFile();

    String baz = "baz";     
    int myInt = Integer.parseInt(baz);
}

在此代码中，IDE 或编译器会提示 createNewFile() 抛出了未处理的异常，我们需要捕获它以允许代码编译。

但是 parseInt() 也会抛出一个异常，NumberFormatException，但我们不需要捕获它，尽管这似乎是个好主意。为什么我们不需要捕获该异常？

Answer 1

规则是不需要捕获扩展 RuntimeException 的异常。

NumberFormatException 扩展了 IllegalArgumentException，后者扩展了 RuntimeException。

来自Oracle documentation :

Runtime exceptions can occur anywhere in a program, and in a typical one they can be very numerous. Having to add runtime exceptions in every method declaration would reduce a program's clarity. Thus, the compiler does not require that you catch or specify runtime exceptions (although you can).