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A substring is the part of another string or subset, which is a contiguous sequence of characters within one string. Note that Java is a common language used by web developers, and substring in Java has several applications. This post will give you an insightful understanding of Java substring. Learn more about thread-in-java.
Want to know about Java substring? Substring in the Java programming language is a common method used for creating smaller strings from bigger ones. Note that strings in Java are immutable, so the original string will be constant while the method brings a new string.
This method produces the ndexOutofBoundsException only when endIndex is less than the startIndex, endIndex/StartIndex is negative, or endIndex/StartIndex is more than its string's length. Note that in string.substring(int startIndex, int endIndex), the endIndex remains exclusive, although its startindex is inclusive. The string remains an object of its string class. Here's the list of functions:
The substring() function in Java Programming is for extracting only a part of the given string. The function will return the new string that contains a small part of its original string, beginning from its specified index to its end or to a specific end index.
To understand the substring method Java, you need to understand a few things.
Suppose you have a string, for instance, "Hello, World!" What if you want to extract the substring "World"? You can do that simply by utilising a substring technique with the help of this:
String str = "Hello, World!"; String substr = str.substring(7, 12);
The Java substring(begIndex, endIndex) process extracts a part of the given string. It then returns the new string that contains the original characters of the string from begIndex (inclusive) to endIndex (exclusive).
String str = "Hello World"; String substr = str.substring(6, 11); System.out.println(substr); // Output: "World"
Here, the substring() method is on the str string with parameters 6 as well as 11. That means the new substring starts at its index 6 (letter 'W' in "World") & ends at index 11 (last letter is 'd' in "World"). The resulting substring gets assigned to a substrate variable and then printed to its console.
Read More: Find out more about Business Analytics and Data Science courses and other details
Java Substring Syntax substring() accepts 2 parameters – start is its index position from which substring begins and is inclusive end is the index position where the substring must end if it is exclusive. As of default, its end value remains equal to the string's length.
Here's a small example of Java substring() method:
import java.lang.*; public class StringDemo { public static void main(String[] args) { String str = "This is tutorials point"; String substr = ""; // prints the substring after index 8 till index 17 substr = str.substring(8, 17); System.out.println("substring = " + substr); // prints the substring after index 0 till index 8 substr = str.substring(0, 8); System.out.println("substring = " + substr); } }
Applications in Java
Suffix and Prefix extraction
You may consider this if you wish to extract the last name from the given name or digits after its decimal point from the string that contains digits both after & before the point.
Checking palindrome
It is used for checking whether or not the given string is a palindrome.
Besides the above-mentioned operations, it is also used for getting substrings of the string.
Java substring may be obtained from the string object via any of the following two variants:
First: Public String substring(int startIndex)
The first method offers a new String object, which includes the string's substring from a specific inclusive startIndex.
Second: Public String substring(int startIndex, int endIndex)
This is the second method used for returning the new String object, which may include a substring of the string with indexes between startIndex as well as endIndex. When the second argument is already given, its substring starts with its element at its startIndex to endIndex -1.
Substring is the string manipulation function, which manipulates string data types (such as BLOB, BIT, and CHARACTER). In addition, it extracts characters from one string and creates another. Want to learn about the types of inheritance in Java? Click on the link.
String manipulations are common for any programming language. Java involves a huge amount of built-in functions that fulfil the purpose of string manipulations. One can perform different things in Java, such as getting a string's length, finding a character within the string, and more.
String manipulation is the sequence of characters, which are used in Java. Here, strings are used for creating objects. It isn't a primitive type and is used for creating and storing immutable things. You may take it as the constant as you cannot change it soon after it is created.
You need to use a method (the + operator) to use substrings for string manipulation in the programming language.
String str1= "Hello"; String str2 = "World"; String finalResult = str1+" "+str2; 2.
Changing the string's case, you may change the case of the string using toLowerCase() and toUpperCase() Java built-in functions if and when required.
You can attain details about access-modifiers-in-java.
In Java, you may replace the substring via the replace method. The String class offers an overload version of the method. However, it is imperative to note that you use the replace method (CharSequence target, CharSequence replacement).
Delve into the points to understand the techniques and methods used for manipulating strings in Java:
Inappropriately Bounded String Copies happen when the data is copied from a particular source to the fixed-length character array
Read more about OOPS (Object Oriented Programming) Concept in Java by clicking on the link.
Noted below are the runtime exceptions that occur while using substrings in Java
Following these instructions may help avoid common errors:
Narrated below are the best practices while working with substrings in Java (learn the Static Method in Java here):
So, this post has explained everything about substring in Java, starting from substring meaning, definition, methods, different parameters, operations, errors, and best practices.
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