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Modify the value associated with a given key in Java HashMap; Java Program to remove a key from a HashMap only if it is associated with a given value; Java Program to copy all the key-value pairs from one Map into another; Create a HashMap in Java; What happens when we try to add a duplicate key into a HashMap object in java? //***** // PairOfDice.java Author: Kevin Uriel Azuara Fonseca // // Using the Die class defined in this chapter, write a class called PairOfDice, // composed of two Die objects. Learn different ways of iterating through the entries of a Map in Java. In Java, Map.Entry is an excellent example that has a meaningful name which represent a key-value pair. A pair provide a convenient way of associating a simple key to value. Tuples in Java 3. The JavaTuples library includes the Pair class. It refers to the elements as 'left' and 'right'. How to determine length or size of an Array in Java? References : https://docs.oracle.com/javafx/2/api/javafx/util/Pair.html, This article is contributed by Chirag Agarwal. If the Object to be tested is not a Pair or is null, then this method returns false.. Two Pairs are considered equal if and only if both the names and values are equal. Examples: Input: arr[] = {6, 5, 2, 3, 5, 2, 2, 1} Output: 2 (arr[1], arr[4]) and (arr[2], arr[5]) are the only possible pairs. Eclipse Collections has Pair and all combinations of primitive/object Pairs (for all eight primitives). Here,