Introduction to the TriFunction Interface in Java

Using the TriFunction Interface in Java

The TriFunction interface in Java is a functional interface that allows you to define a function with three arguments. It is a part of the java.util package and it is used to provide an easy way to implement functions that take three arguments. This type of interface is useful for defining complex functions such as applying an operation on three elements.

The TriFunction interface has three type parameters: T, U, and R. The first parameter, T, is the type of the first argument. The second parameter, U, is the type of the second argument. The third parameter, R, is the return type of the function.

To use the TriFunction interface, you need to define a class that implements the TriFunction interface. In this class, you must override the apply() method. This method will be invoked when you call the apply() function with three arguments. The apply() method should return an object of type R.

You can also create a generic function that takes in a TriFunction instance and uses it to apply the operation on three arguments. For example, below is a generic function that takes in a TriFunction instance and two objects, x and y. It then calls the apply() method with x, y and the TriFunction instance to get the result.

public static &ltR&gt myGenericFunction(TriFunction&ltT, U, R&gt tf, T x, U y) {
    return tf.apply(x, y);
}

Using the TriFunction interface can help you write more concise and maintainable code. It is also useful for implementing complex functions that take multiple arguments and produce a result.