The role of throws in java

The throws keyword in Java declares exceptions that may be thrown, allowing the caller to handle the exception and allowing the exception to be passed up the call stack. Advantages include: improved code readability, prompting callers to handle exceptions, and exception propagation.

The role of throws in Java

The throws keyword is used to declare exceptions that may be thrown by a method. When a method is called, if an exception is thrown, the exception will be passed to the caller.

How it works

• Use the throws keyword in the method signature to declare the exception thrown.
• If a declared exception occurs in a method, it will be thrown explicitly using the throw statement.
• If the calling method does not catch the exception, the exception will be passed up the call stack until it is caught or causes the program to terminate.

Usage

• The throws keyword is used with a method signature, followed by the type of exception that may be thrown.
• You can declare multiple exceptions, separated by commas.
• If the method does not throw any exceptions, you do not need to use throws.

Example

public void readFile() throws IOException {
    // 代码可能抛出 IOException
}

Advantages

Using throws has the following advantages:

• Improve code readability: it clearly declares the exceptions that the method may throw.
• Forces the caller to handle exceptions: It forces the caller to catch or pass the exception.
• Exception propagation: It allows exceptions to propagate up the call stack.

Note:

• Methods can only throw exceptions declared in the throws clause.
• If a method throws an undeclared exception, the compiler will generate an error.
• Throws should be used with caution and only when the method is indeed likely to throw the exception.

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