Java Gists

There is an overloaded version of the String.join method that accepts as parameter an Iterable implementation. Since all Collection classes implement the Iterable interface, this method can be used to concatenate all the elements in a Collection. The following code demonstrates this: This code creates a List of String values...

Java 8 has added a static join method to the String class. This concatenates Strings using a delimiter. Performance wise, it is similar to StringBuffer.append, but it has the added advantage that it automatically adds a delimiter. As before, this code creates string1 and string2. It invokes the join...

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 creation of new String objects. So StringBuffer and StringBuilder...

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 creation of new String objects. So StringBuffer and StringBuilder...

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 concat() method on string1 and passes string2 as an argument....

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 concatenation operator. It can be used to concatenate Strings. 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. The Stream interface has a method called distinct that can...

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 obtain an array that is of the same data type...

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 LinkedHashSet is created and the addAll method is invoked by...

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 any input parameters. It returns an object array. The following...

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 a LinkedHashSet. The input List is passed as a parameter...

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 on the input List which returns a Stream corresponding to...