throws try cat ch

`throws`, `try`, and `catch` are keywords in Java used for exception handling.

`throws` is used in the method signature to declare that a method may throw an exception. This is used to notify the caller of the method that they need to handle the exception.

`try` is used to enclose a block of code that may throw an exception. If an exception is thrown within the `try` block, the program will jump to the `catch` block.

`catch` is used to catch an exception that has been thrown by the `try` block. It allows for the programmer to handle the exception in a specific way.

Together, these keywords allow for the programmer to handle exceptions gracefully and prevent the program from crashing.

相关问题

java try catch后要不要throw

在 Java 中，try-catch 块是用来捕捉异常并进行相应处理的。如果在 catch 块中处理了异常，那么就不需要再抛出异常了。但是如果在 catch 块中无法处理异常，那么就需要将异常抛出，让调用该方法的上层方法进行处理。

下面是一个示例：

public void doSomething() throws Exception {
    try {
        // 一些可能会抛出异常的操作
    } catch (Exception e) {
        // 处理异常，如果无法处理，可以将异常抛出
        throw e;
    }
}

在这个示例中，如果 try 块中的操作抛出了异常，catch 块会捕捉到该异常并进行处理。如果可以处理该异常，那么就不需要再抛出异常；如果无法处理该异常，那么就需要将该异常抛出，让调用该方法的上层方法进行处理。因此，在 catch 块中是否需要抛出异常，取决于你能否处理该异常。