How-to articles, tricks, and solutions about COLLECTIONS
How do I efficiently iterate over each entry in a Java Map?
There are several ways to iterate over the entries in a Map in Java. Here are some options:
How to directly initialize a HashMap in Java?
To directly initialize a HashMap in Java, you can use the put() method to add elements to the map.
How to get the first element of the List or Set?
To get the first element of a List or Set in Java, you can use the following methods:
How to Initialization of an ArrayList in one line in Java
You can initialize an ArrayList in one line in Java using the following syntax: