Module org.junit.jupiter.api

Package org.junit.jupiter.api.function

Interface ThrowingSupplier<T>

Type Parameters:

T - the type of argument supplied

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
@API(status=STABLE,
     since="5.0")
public interface ThrowingSupplier<T>

ThrowingSupplier is a functional interface that can be used to implement any generic block of code that returns an object and potentially throws a Throwable.

The ThrowingSupplier interface is similar to Supplier, except that a ThrowingSupplier can throw any kind of exception, including checked exceptions.

Rationale for throwing Throwable instead of Exception

Although Java applications typically throw exceptions that are instances of Exception, RuntimeException, Error, or AssertionError (in testing scenarios), there may be use cases where a ThrowingSupplier needs to explicitly throw a Throwable. In order to support such specialized use cases, get() is declared to throw Throwable.

Since:

5.0

See Also:

• Supplier
• Assertions.assertTimeout(java.time.Duration, ThrowingSupplier)
• Assertions.assertTimeoutPreemptively(java.time.Duration, ThrowingSupplier)
• Executable
• ThrowingConsumer

Method Summary

Modifier and Type	Method	Description
T	get()	Get a result, potentially throwing an exception.

Method Details

get

T get()
throws Throwable

Get a result, potentially throwing an exception.

Returns:

a result

Throws:

Throwable