Java is a widely used OOP (object oriented programming) language which works on the concept of objects and classes. It provides numerous methods for specifying different values sizes and values to be stored in variable. There are two major data types namely Primitive and Non-Primitive in Java. The Primitive data types primarily include int, long, float double char, short, Boolean and byte. The Non Primitive data type has the inclusion of arrays, strings, classes and interfaces. This article is majorly related to strings and ArrayList in Java.
What is ArrayList in Java?
ArrayList in Java is defined as a collection framework which is primarily present in the java.util.package. It is mainly used for dynamic arrays in Java. However, this might be comparatively slower than the basic and standard arrays but is majorly helpful in the creation of programs where lots of manipulation is needed. For instance, assume that a program has to be created for calculation of tax. The program will provide an output based upon numerous parameters such as marginal tax rate, the overall income, number of households, etc. Secondly let’s assume that a program for ticket fee calculation of zoo has to be developed. The overall output would be based upon number of visitors, age of visitors, the timing of visit, and several other parameters.
In such programs, there would a considerable amount of manipulation because of presence of large number of parameters. Standard array would fail to comply with data manipulation and prove to be unusable in such cases. Thus, in such cases ArrayList in Java could be used in appropriate manner to extract exact and precise results. Below given are numerous reasons which specifies the usage of ArrayList in Java for creation of programs with dynamic array and seamless manipulation –
• ArrayList has the capability of inheriting Abstract List class and implementing the List interface.
• Further, Java ArrayList would allow the user to randomly access the list.
• It uses a dynamic array for the creation and storing of elements by inheriting Abstract List and implementing List.
• The overall class might or might not contain repeating duplicate elements and the class would maintain seamless and continuous insertion order.
• It would also allow random access because the prime functionality of array is to work upon the index basis.
ArrayList in Java would provide a highly seamless and coordinated method for storage of various data types. This could be highly useful in scenarios and programs which requires high degree of continuous manipulation. Thus, this non-primitive data type is of high use irrespective of the type of data to store. Apart from ArrayList, String in Java is an important and essential data types that allow the user to store strings and data in the form of a sequence of continuous and seamless characters. With the help of strings, an end user could easily store a continuous sequence of multiple characters in an appropriate manner.
String could also be defined as a contiguous array of characters. However, the overall difference between string and character array could be appropriately terminated with the help of special character named as ‘0/’. In simple words, the String comprises a continuous collection of characters which are surrounded with the help of double quotes. In addition, string provides an easy and convenient method for the end user to store data in a structured form. For instance, as per the examples discussed above, while creating a program for calculation of tax or calculation of ticket fee for zoo. The names of users or visitors would have to be stored with the help of string only in Java.
With the help of ArrayList and String in Java, a large number of effective programs could be created with ease. Both data types are the most standard and appropriate data types for the creation of wide range of computational programs. Moreover, with the help of string, an end user would be able to perform wide range of computational operations such as comparison. Java provides numerous inbuilt functions and attributes of string using which an end user would be able to appropriately perform complex operations with ease. For instance, string builder, string tokenizer, string comparison, etc. are some of the most widely used functions.
Hence, Java provides an end user with a wide range of primitive and non-primitive data types to choose from. With the help of wide number of options, it becomes extremely convenient and easy for a professional coder to develop sophisticated programs which are able to perform complex calculations and operations with ease. Thus, string and array list are an important and essential method of developing effective Java-based programs.