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Functions for Strings in Java

What Is a String?

Firstly, of course, we have to initialize our string. What is a string used for?

  • You want to look at your string as a line, not as a mass of symbols.
  • If you have a long text, you want to work with the words, not the letters.
  • If you have lots of information, you need functions that solve questions as quickly as possible.

Initializing a String

String line;

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Going Beyond Java 8: Text Blocks

Introduction

String is undoubtedly the most used class in Java, and represents an exception among the classes of the standard library. In fact, its objects are always immutable, and these can be instantiated with a simplified syntax that makes us avoid the verbosity of the new operator and the call to the constructor, as is standard for almost all other classes. In addition, the memory management of these String objects is characterized by the reuse of instances already created through an internally-managed pool of strings. 

In the latest versions, other improvements are being made to this fundamental class to make its use more efficient, simpler to use, and less verbose. The compact strings introduced in Java 9 have undoubtedly made strings more performing. Then with Java 13, a new feature called text blocks has been introduced that allows us to use the String class in a more profitable and easier way. 

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How to Define Method to Take and Return String Data in Java

In Java,  char[] ,  String ,  StringBuffer , and  StringBuilder are used to store, take, and return string data. One question that may come to your mind is, "What is the best way for defining a method to take string data and return string data in Java?"

We have four ways to take and return string data:
1) char[]/byte[]
2) String
3) StringBuilder
4) StringBuffer

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Java String Tutorials: Become a Java Strings Virtuoso

Intro to Java Strings

Java String
Get Ready to Learn About Java Strings!

  1. String Memory Internals by Tomasz Murkiewicz. The main point to understand here is the distinction between String Java object and its contents - char[] under private value field. String is basically a wrapper around char[] array, encapsulating it and making it impossible to modify so the String can remain immutable. Also the String class remembers which parts of this array is actually used. This all means that you can have two different String objects (quite lightweight) pointing to the same char[].

  2. Top 10 Questions of Java Strings by Ryan Wang. A discussion of ten common questions Java developers face when working with Strings. Though this is a bit of an old post (published in 2013), we hope you'll still find some value in these lessons.