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Comparator Interface is a very useful interface which is used to sort the objects on some predefined conditions. Usually when we want to sort Integer type ArrayList then we use Collections.sort(arrayListName). This will sort the list of integers in ascending order. …
Iterator returned by entrySet() and keySet() methods can be used to iterate a HashMap in Java Let us look at the code for the iterator using both entrySet() and keySet() methods: Output 0
HashMap is a popular class of Collections framework which is used to store key value pair. There are 2 ways to iterate over the hashmap and access its keys and values. Let us look at these ways: Using entrySet() method entrySet() …
We are not allowed to enter duplicate keys in HashMap, but we can enter duplicate values in it. Please note here that, if we enter duplicate keys no error will be thrown but the latest key-value pair entered will replace the …
HashMap is one of the most used collections in Java. It is used to store key value pair. The size of HashMap increases as more key value pairs are added. Let us look at sample declaration of HashMap: HashMap<Integer,String> dummy = …
ArrayList is a dynamic array which means the size of arraylist increases as the elements are added. The number by which the size is increased is known as Growth Factor. In ArrayList the Growth factor is 1.5, which means everytime the …
Arraylist is a dynamic array whose size increases as we add more elements to it. When an ArrayList is created without specifying its size then the size of Arraylist initially is zero. But when we add the first element to the …
ArrayList is one of the most used Collections in java. It is a dynamic array which means its size can increase automatically as more elements are added to it. Let us see how to create an arraylist: ArrayList<Integer> arrList = new …
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