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Comparator interface is used to order the objects of user-defined classes. A comparator object is capable of comparing two objects of two different classes. Following comparator will sort by ID Example Output You can...
In order to sort first by ID and if the Id’s are same then sort by name. Please follow the code Example Output
One of the common problem while removing elements from an ArrayList in Java is the ConcurrentModificationException. If you use classical for loop with the index or enhanced for loop and try to remove an...
A comparable object is capable of comparing itself with another object. The class itself must implements the java.lang.Comparable interface to compare its instances. Example Output In the above example, ID 5 is same for...