Java 8 | BiFunction | BiPredicate | BiConsumer

BiFunction

• The lambda expression assigned to an object of BiFunction type is used to define its apply() which eventually applies the given function on the arguments.

R apply(T t, U u);

• The main advantage of using a BiFunction is that it allows us to use 2 input arguments while in function we can only have 1 input argument.

@FunctionalInterface
public interface BiFunction<T, U, R> 

• T — Type of the first argument to the function.
• U — Type of the second argument to the function.
• R — Type of the result of the function.

• 10. lines, we defined BiFunction with concat method.
• 12.lines, we used apply method and put values.
• 18.lines, we call powToString method, the method expects 2 integer values and a biFunction and a Function.
• The method takes values and does Math.pow and then convert the result to String.

BiConsumer

• BiConsumers are useful when it is not required to return any value as they are expected to operate via side-effects.
• We use accept method of BiConsumer

void accept(T t, U u)

• BiConsumers is that it allows us to use 2 input arguments while in function don’t return any value

@FunctionalInterface
public interface BiConsumer<T, U>

• T — Type of the first argument to the function.
• U — Type of the second argument to the function.

• 10. lines, we defined BiConsumer with map
• 15–18.lines we put some values in map while we called putMap method

BiPredicate

• BiPredicate is a functional interface, which accepts two arguments and returns a boolean for the test

boolean test(T t, U u);

• T — Type of the first argument to the function.
• U — Type of the second argument to the function.

@FunctionalInterface
public interface BiPredicate<T, U> {

• 7.lines we defined BiPredicate,
• we put 2 arguments while called filterBiPredicate method and we used test(T t, U u) method,

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References:
BiFunction
BiConsumer
BiPredicate