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FOR YOUR CURIOSITY

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CORE API / NOTES</>↗
Core API20 Mar 2025

How do I use the UnaryOperator functional interface in Java?

The UnaryOperator functional interface in Java is a specialized form of the Function functional interface. It is used when both the input and output of a function are of the same type. This interface plays a role when we want to perform an operation on a single operand and return a result of the same […]

Wayan · 3 min read
CORE API / NOTES</>↗
Core API19 Mar 2025

How do I use the ToLongBiFunction functional interface in Java?

The ToLongBiFunction is a functional interface introduced in Java. It is part of the java.util.function package, and it represents a function that accepts two arguments (of generic types) and produces a long result. The functional method in this interface is: long applyAsLong(T t, U u); Here’s how we can effectively use the ToLongBiFunction: Steps to […]

Wayan · 3 min read
CORE API / NOTES</>↗
Core API19 Mar 2025

How do I use the ToIntFunction functional interface in Java?

The ToIntFunction functional interface in Java is part of the java.util.function package and represents a function that accepts one argument and produces a int-valued result. It is a functional interface with a single abstract method int applyAsInt(T value), making it a good candidate for usage in lambda expressions or method references. Here’s how to use […]

Wayan · 3 min read
CORE API / NOTES</>↗
Core API19 Mar 2025

How do I use the ToIntBiFunction functional interface in Java?

The ToIntBiFunction is a functional interface in Java that comes from the java.util.function package. It represents a function that accepts two arguments and produces an int as a result. This interface is useful when we need to create a lambda expression or method reference that takes in two arguments of generic types and returns an […]

Wayan · 3 min read
CORE API / NOTES</>↗
Core API18 Mar 2025

How do I use the ToDoubleFunction functional interface in Java?

The ToDoubleFunction is a functional interface in Java that is part of the java.util.function package. It represents a function that takes a single input of type T and produces a double as a result. This is useful when we need to perform operations that convert objects to primitive double values, such as extracting a numeric […]

Wayan · 3 min read
CORE API / NOTES</>↗
Core API18 Mar 2025

How do I use the ToDoubleBiFunction functional interface in Java?

The ToDoubleBiFunction is a functional interface in Java defined in the java.util.function package. It represents a function that takes two arguments of any types and produces a double result. It can be used wherever we need to take two input arguments and return a double value. Here is a breakdown of its functional method: @FunctionalInterface […]

Wayan · 3 min read
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Putu Adi Guna Permana
ABOUT THE AUTHOR

Dr (C). Ir. Putu Adi Guna Permana, S.Kom., M.Kom., IPM., ASEAN Eng.

Writer and founder of Diary Coding — sharing notes, tutorials, and experiences about programming for anyone who wants to keep learning.