In Java, just like methods, variables of a class too can have another class as its member. Writing a class within another is allowed in Java. The class written within is called the nested class, and the class that holds the inner class is called the outer class.SyntaxFollowing is the ... Read More

In order to copy elements of ArrayList to another ArrayList, we use the Collections.copy() method. It is used to copy all elements of a collection into another.Declaration −The java.util.Collections.copy() method is declared as follows −public static void copy(List

In order to get enumeration over ArrayList with Java Collections, we use the java.util.Collections.enumeration() method.Declaration −The java.util.Collections.enumeration() method is declared is as follows −public static Enumeration enumeration(Collection c)where c is the collection object for which an enumeration is returnedLet us see a program to get enumeration over ArrayList −Example Live ... Read More

In order to replace all occurrences of specified element of ArrayList with Java Collections, we use the Collections.replaceAll() method. This method returns true if list contains one or more elements e such that (oldVal==null ? e==null : oldVal.equals(e)).Declaration −The java.util.Collections.replaceAll() is declared as follows −public static boolean replaceAll(List list, ... Read More

Java is a multi-threaded programming language which means we can develop multi-threaded program using Java. A multi-threaded program contains two or more parts that can run concurrently and each part can handle a different task at the same time making optimal use of the available resources specially when your computer ... Read More

Many a times a program needs to iterate through a list of files in the file system, often with names matching a pattern. The glob module is useful in creating lit of files in specific directory, having a certain extension, or with a certain string as a part of file ... Read More

In order to convert first character as upper case in a sentence we have to first separate each word of sentence and then make first character of each word in upper case.After which we have to again join each word separated by space to make again sentence.Now let take each ... Read More

Is it possible to create and run a Java program without any class? The answer is Yes. Trick is to use enum instead of Class. Although enum is used to represent public static constant. It can have static main method as well. See the example below −Example Live Demopublic enum Tester ... Read More

The tempfile module in standard library defines functions for creating temporary files and directories. They are created in special temp directories that are defined by operating system file systems. For example, under Windows the temp folder resides in profile/AppData/Local/Temp while in linux the temporary files are held in /tmp directory.Following ... Read More

Lambda expressions are introduced in Java 8 and are touted to be the biggest feature of Java 8. Lambda expression facilitates functional programming, and simplifies the development a lot.SyntaxA lambda expression is characterized by the following syntax.parameter -> expression bodyFollowing are the important characteristics of a lambda expression.Optional type declaration ... Read More