StringTokenizer in java.util package is very useful for spliting the length string into the pieces. You can pass a delimeter to the StringTokenizer constructor to split the string where ever that delimeter appeared in the string. If you have not passed any delimeter, by default it splits the string using the empty space in the …
Java
Compressing and Uncompressing File Example in Java
Compressing and Uncompressing of the files is one of the common utility we use in our daily life. If you are using windows, using WinZip is very common to compress the files and sent to others. The advantage of compressing the files is to save the memory occupied for the file in the disk. It …
How To Sort Java Object Using Comparable And Comparator?
This tutorial shows how to use java.util.Comparator and java.lang.Comparable to sort a Java object based on its property value. Here I have created Employee object with Name and Age properties, we will be able to sort the list of objects based on the values in the property’ Lets look at the example. Employee.java ComparatorExample.java Output …
HashTable in Java
HashTable class was originally added as part of java.utill package and extended the Dictionary class. From Java 2, it is re-engineered to implement the Map interface and made as part of the collections framework. HashTable is similar to HashMap except that HashTable is synchronized. It is very much similar to HashMap, stores the key-value pairs. …
HashMap in Java
HashMap uses the hash table to implement the Map interface. Map is key-value pair where key is the reference and value is the actual data. HashMap is very extensively used in the projects when key-value type data is stored. This doesn’t ensure the order of insertion. This class extends the AbstractMap and implements the Map …
HashSet in Java
HastSet is one of the classes available with collections package and it extends the AbstractSet and implements the Set interface. This uses the hash table for storing the values. Hash table internally using hashing mechanism to store the values. In the hashing technique, information is uniquely identified using the hash code. HashSet supports four constructors. …
LinkedList in Java
LinkedList is not most commonly used class for storing the values. The LinkedList class extends AbstractSequentialList and implements the List interface. It stores the data using linked-list data structure. This class has two constructors, With empty parameters – LinkedList() and With Collection object as the parameter – LinkedList (Collection c) Some of the important features of …
ArrayList in Java
ArrayList is most widely used collections API for storing the list of objects. This class is equivalent to Vector, except that it is unsynchronized. Look at the below important points about the class ArrayList. It allows null values It stores the duplicate elements The size of the list is grows dynamically when more elements are …