What Is Difference Between Throw And Throws In Java
Understanding the Difference Between 'throw' and 'throws' in Java
What Is Difference Between Throw And Throws In Java
In Java, “throw” is used to explicitly throw an exception within a method, indicating that an error has occurred, while “throws” is used in method signatures to declare the types of exceptions that a method might throw during its execution. When an exception is thrown using the “throw” keyword, it must be caught and handled using a try-catch block or propagated up the call stack using the “throws” keyword in method signatures. So, “throw” is used to raise an exception, whereas “throws” is used to declare the exceptions that a method might throw.
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1 - Keyword Usage:
`throw` is used in Java to explicitly throw an exception within a method, while
`throws` is used in method signatures to declare the type of exceptions that a method might throw.
2) Single vs Multiple Exceptions:
`throw` is used for throwing a single exception object, while
`throws` is used for declaring multiple exceptions that a method can throw.
3) Syntax and Placement:
`throw` is followed by the exception object that is thrown, while
`throws` is used in a method declaration followed by exception classes separated by commas.
4) Compile time Check:
The use of `throw` is checked at compile time for correct exception types, while
The use of `throws` in method signatures does not affect the compile time checking.
5) Exception Handling:
`throw` is part of the exception handling mechanism to throw user defined or system generated exceptions, while
`throws` is not directly involved in handling exceptions but is used for specifying exceptions that need to be handled.
6) Role in Exception Propagation:
`throw` is used to throw exceptions at a specific point in the code, causing an immediate exit from the current block, while
`throws` is used to propagate exceptions to the calling method or class for handling.
7) Handling Checked vs Unchecked Exceptions:
`throw` is generally used for throwing unchecked exceptions (RuntimeException or its subclasses), while
`throws` is used to declare both checked and unchecked exceptions in a method signature.
8) Usage Scenarios:
`throw` is typically used when a specific error condition occurs in a method and an exception needs to be raised, while
`throws` is used to indicate the types of exceptions that a method can throw, allowing the calling code to handle them appropriately.
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9) Affect on Control Flow:
`throw` affects the control flow of the program by immediately transferring control to the nearest catch block or an exception handler, while
`throws` simply declares the potential exceptions that a method might throw without impacting the flow directly.
10) Common Errors:
Misusing `throw` instead of `throws` or vice versa can lead to compilation errors, so understanding the correct usage of each keyword is crucial for writing error free Java code.
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