What is the if-else statement?

The if-else statement is a conditional statement. It is used to execute a statement or group of statements based on some condition. The general format of the statement is given below: if(boolean_expression)    {statements;} else    {statements;} The......[read more]

What is array initializer?

An array initializer is a list of values or expressions used to simultaneously create and initialize the elements of an array. The values contained in an array initializer are separated by commas and placed within curly braces, i.e., between "{" and "}". When an array initializer is used to......[read more]

What is length field?

All arrays in Java have a public final field known as length. This field is used to find the number of elements that the array holds. Once an array is created, its size can be obtained by using the length field qualified by the array name along with a dot operator. For example, the given......[read more]

What is concatenation?

Concatenation is the process of joining two or more strings. Strings can be joined in three ways: + operator += operator concat function Each of them is shown with an example as follows: The + operator The + operator can be used to concatenate the strings as follows:......[read more]

What is Generics?

Generics is one of the features added to J2SE 5. It allows a Java programmer to abstract over types. It is most useful with collections such as Set and List. Collections are bound to contain a specific type of object. Therefore, if a programmer tries to insert any element other than the specified......[read more]

What is StringBuilder?

StringBuilder is a class, which is very similar to the StringBuffer class. It is a new concept introduced in J2SE 5. Like the String and the StringBuffer classes, it extends directly from the Object class. The StringBuilder class can act as an alternative to StringBuffer in places where the......[read more]

What is a for-each loop?

A for-each loop is an enhanced for loop. It used to iterate over arrays and collections. This feature was added to Java to make the access and retrieval of elements of arrays and collections faster. The syntax of a for-each loop is as follows: for(type itrvar: collection) { } where,......[read more]

What is pass-by-reference?

In pass-by-reference, an object reference is passed to the calling method. The object reference that is passed is a copy of the original object reference and not the actual reference itself. Therefore, the caller and the called method will have identical copies of the reference. Hence, both of......[read more]

What is the Comparable interface?

The Comparable interface is used to sort collections and arrays of objects using the Collections.sort() and java.utils.Arrays.sort() methods respectively. The objects of the class implementing the Comparable interface can be ordered. The Comparable interface in the generic form is written as......[read more]

What is a split() function?

A split() function was added to Java 1.4. It belongs to the String class. It simplifies the task of breaking (splitting) a string into substrings or tokens. As an argument to split(), a character (or a blank space) is passed where the string is split. The signature of a split function is as......[read more]