Both of these are concepts used for exception handling, but there is a fundamental difference between throw and throws in Java. We use the throws keyword to declare what exceptions we can throw from a method. The throw keyword, on the other hand, is mainly used to throw an exception explicitly within a block of code or a method. We can use the throws keyword in a method signature. It declares what exceptions a method can throw. Now, the throw keyword can be used in a block of code or within a method body. It helps in throwing one exception explicitly. These also help in throwing custom exceptions.
Difference between Throw and Throws in Java
Let us talk about the differences between Throw and Throws in Java.
| Parameters | Throw in Java | Throws in Java |
| Definition | The throw keyword helps in throwing an exception in the program, explicitly inside some block of code or inside any function. | We use the throws keyword in the method signature. We use it to declare some exceptions thrown by a function when the code is getting executed. |
| Internal Implementation | The throw keyword is implemented internally because it is only allowed to throw a single exception at once. It means that it is not possible to throw multiple exceptions when we are using the throw keyword. | With the throws keyword, on the other hand, one can easily declare various exceptions. These could be thrown by any function when using the throws keyword. |
| Type of Exception | One can only propagate the unchecked exceptions using the throw keyword. It means that no checked exception can be propagated when we use the throw keyword. | When we use the throws keyword, we can declare both unchecked and checked exceptions. The checked expression must always use the throws keyword for propagation followed by a specific name of the exception class. |
| Syntax | The instance variable follows the throw keyword. | The exception class names follow the throws keyword. |
| Declaration | When we are using the throw keyword, we must ensure that we are using the throw keyword within the available method. | The throws keyword, on the other hand, must always be used within the signature of a method (method signature). |
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