Supplier Interface is another Built-In Functional Interface of java.util.function package of Java 8. Supplier Interface used for assignment purposes. It has only one abstract method and doesn’t have any default or static method. Below is the get() method signature. It doesn’t accept any argument and return an object.
T get()
Primitive type specialization Supplier Interface
java.util.function package has a few more supplier interface:
- IntSupplier – Represents the Integer value and has one method getAsInt().
- LongSupplier – Represents the Long value and has one method getAsLong().
- DoubleSupplier – Represents the Double value and has one method getAsDouble().
- BooleanSupplier – Represents the Boolean value and has one method getAsBoolean().
Example for Supplier Interface using Lambda
public class SupplierExample
{
public static void main(String[] args) {
Supplier<Double> pi = () -> (22.0/7);
System.out.println(pi.get());
}
}
Output
3.142857142857143
Conclusion
In this article, we have seen about supplier interfaces and other primitive specialized interfaces.
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