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In general both equals() and “==” operator in Java are used to compare objects to check equality but here are some of the differences between the two: Main difference between .equals() method and == operator is that one is method and other is operator. We can use == operators for reference comparison (address comparison) and …
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Using for each to iterate through a HashMap Using for each to iterate through a HashMap import java.util.HashMap; import java.util.Map; public class IterateHashMap { public static void main(String[] args) { Map<String, String> map = new HashMap<String, String>(); map.put("key1", "value1"); map.put("key2", "value2"); for (Map.Entry<String, String> entry : map.entrySet()) { System.out.println(entry.getKey() + " = " + entry.getValue()); …
I faced a problem when I try to add List to List< List > in java, and it did consume some my time. It is a common problem and I even can remember I got stuck on debugging because of this "feature" at least twice. To let me remember this problem and avoid making it …
List Interface in Java with Examples The List interface provides a way to store the ordered collection. It is a child interface of Collection. It is an ordered collection of objects in which duplicate values can be stored. Since List preserves the insertion order, it allows positional access and insertion of elements. List<Integer> l1 = …
Arrays An array is a group of like-typed variables that are referred to by a common name.Arrays in Java work differently than they do in C/C++. Following are some important point about Java arrays. In Java all arrays are dynamically allocated.(discussed below) Since arrays are objects in Java, we can find their length using member …