Difference between throw and throws in Java:
The throw and throws keywords in Java are related to exceptions, but they have different uses and meanings.
throw is used to explicitly throw an exception in a method or block of code. It is used to indicate that something unexpected has happened during the execution of the code, and the normal flow of the program cannot continue. When throw is used, the code execution is immediately stopped, and the thrown exception is propagated up the call stack until it is caught and handled by an appropriate catch block.
For example:
public void myMethod(int arg) {
if (arg< 0) {
throw new IllegalArgumentException("Argument must be non-negative");
}
// rest of method code
}
In this example, the throw keyword is used to throw an IllegalArgumentException if the argument passed to the method is negative.
On the other hand, throwsis used in a method signature to declare that a method may throw one or more exceptions. When a method is declared with throws, it means that the method itself does not handle the exceptions that it may throw, and that the calling method or the caller of the calling method must handle the exception.
For example:
public void myMethod(int arg) throws IllegalArgumentException {
if (arg< 0) {
throw new IllegalArgumentException("Argument must be non-negative");
}
// rest of method code
}
In this example, the throws keyword is used in the method signature to declare that myMethod may throw an IllegalArgumentException. This means that any calling method must either handle the exception with a try-catch block or declare that it throws the exception itself.
In summary, throw is used to explicitly throw an exception, while throwsis used to declare that a method may throw one or more exceptions.
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