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In addition to String, Java has the java.lang.StringBuffer and java.lang.StringBuilder classes. These can also be used to concatenate Strings. The advantage of these classes is that both these classes are mutable, so using them does not result in...

The String class has a method called concat. It accepts as parameter a String value and concatenates it with the current String. The following code demonstrates this: As before, this code creates string1 and string2. It then invokes the...

In Java, a String is a sequence of characters. There are often programming situations where you will need to concatenate Strings. There are several ways in which you can achieve this. The + operator is also known as the...

Java 8 has added the Stream API that helps to easily perform bulk operations on Collections. A new method called stream() method has been added to all the collection interfaces that returns a Stream corresponding to the underlying collection....

There is an overloaded version of the toArray method. This accepts an array as a parameter and returns a result array that is of the same data type as the input array. So basically, this toArray  method can be used to...

The Set interface has a method called addAll. This accepts a 'Collection' as the parameter. So if you invoke this method by passing the 'List', the duplicates will be eliminated. The following code snippet demonstrates this method. Here, a new...

Java provides a toArray method on the 'List' interface. This can be used to convert a 'List' to an array. Since there are are two overloaded versions, one of these method is explained below. This toArray method does not accept...

Another implementation of the Set interface is LinkedHashSet. LinkedHashSet maintains the order of elements and helps to overcome the HashSet limitation. The following code demonstrates this: This code is quite similar to the one seen earlier, except that it uses...

There is an overloaded version of the Stream.toArray method which can be used to return a result array that is of the same data type as the input array. The following code demonstrates this: Firstly, the 'stream()' method is invoked...

The Set is also an interface in the 'Java Collection' framework. Unlike a List, a Set does not allow duplicates. Hence you can use a Set to eliminate the duplicates in a List. There are several ways in...

Java 8 has added the Stream API that helps to easily perform bulk operations on Collections. A new method called stream() has been added to all the collection interfaces that returns a Stream corresponding to the underlying collection. There is...

The simplest way to remove duplicates from a 'List' is to use a for-loop. The following code snippet demonstrates this method. First, the code creates a new ArrayList to store the output, i.e. a List without duplicates. A for-loop is...

The simplest way to convert a List to an array is to use a for-loop. The following code snippet demonstrates this method. First, the code creates an Array based on the number of elements in the input List. A for-loop...