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Hands-On Basics of Substring Java

Hello readers! We’re back with our technical article that will help you in many ways. Many of you might are unaware of the technical term of substring java. So, in this article, we’re going to elaborate in detail that what is java string substring, its syntax, different examples, unique procedures, etc. that will give keep a full stop on all your rising questions in your mind. So, don’t let go of time and have a deep look at today’s article.

String class intro – Basics of Java

The Java String class has become one of the Java Class Library’s wealthiest classes. With innumerable built-in features, it encourages developers to concentrate on more significant application factors rather than recreating the wheel and wasting time and energy from scratch writing string processing functions, so the most often used string functions are bundled in the Java String class. Replace, replaceAll, matches, indexOf, equals, break, etc are among some of the helpful functions in this class.

There is another incredibly viable technique in addition to these techniques, which is used to get a substring from a parental string, based on certain parameters. This method is being known in the world of technology as the substring for Java String. You can also term it as “java substring“.

What the technical term “substring java” exactly refer to?

The java string substring mechanism of the String class returns a new string object, which is a subset of the input string on which the substring procedure is called when called on a string type object or a string literal.

In situations where developers have to get a particular aspect of a string, the string substring java method is particularly useful.

For example, if the name of the email service provider is necessary, the substring method should be used by calling the substring method on the index comprising the ‘@’ character to get the name of the service provider. For example, if a normal person has an [email protected] ID, it is reasonable to use the substring method to get the “company.com” element of the id.

In short, the substring java is one of the processes of Java that resides in the string class of Java.

The substring() java method retrieves you a segment of the provided string.

In the java substring method where the beginning index is included and the ending index is excluded, we send the beginning index and the ending index number location. In other words, the starting of the index begins at 0, while the ending of the index begins at 1.

How the java substring method processes?

One parameter is extracted from the java substring process. Parameter one is the integer index that a substring is recovered from. The substring retrieved is the series of characters beginning at the ending of the given string from the defined index.

Variants of the String substring() form

You can utilize the substring java method in two ways. They are elaborated as below:

 1. The String substring() procedure

There are two alternatives of this approach and it returns the corresponding new string that is a substring of the provided input string. The substring begins at the stated index with a letter and progresses to the termination of this string.

public class Substr_demo {
	public static void main(String args[])
	{
  
    	// Let's initialize the String
    	String Str = new Strin("demo java string program");
  
    	// using substring() process of Java to retrieve the substring
    	// output returns <blank space>program
    	System.out.print("The extracted substring is: ");
    	System.out.println(Str.substring(15));
	}
}

The output retrieved will be:

The extracted substring is: <blank space>program

2. The String substring(beginning_index,ending_index)

There are two alternatives of this approach and it returns the corresponding string that is a substring of the provided string in question. At the given index, the substring starts with the element and progresses to the ending of this string or endIndex-1, if the second argument is specified.

public class Substr2_demo {
	public static void main(String args[])
	{
  
    	// Let's initialize the String
    	String Str = new String("demo java string program");
  
    	// using substring() process of Java to retrieve the substring
    	// output returns java
    	System.out.print("The extracted substring is : ");
    	System.out.println(Str.substring(5, 9));
	}
}

The output retrieved will be:

The extracted substring is: java

Key points to remember for substring java process

1. If all of the below requirements are met, all substring java process will throw the IndexOutOfBoundException, if and only if the below conditions appear in the code:

  • If the StartIndex is negative
  • The endIndex is greater than the length of the element in either of the given string
  • The startIndex is greater than the endIndex

2. In both substring java techniques, beginIndex is inclusive and endIndex is exclusive.

3. The string substring() process of Java will give you an empty string if (beginning of the index = ending of the index).

Let’s take an another illustration of substring() method of Java. Here you go!

public class String_Palindrome_demo_Test {
 	public static void main(String[] args) {
       	System.out.println(check_Palindrome("cacacac"));
       	System.out.println(check_Palindrome("Bnitbn"));
       	System.out.println(check_Palindrome("89098"));
       	System.out.println(check_Palindrome("JJJJJJJJ"));
 	}
 	private static boolean check_Palindrome(String str) {
       	if (str == null)
            	return false;
       	if (str.length() <= 1) {
            	return true;
       	}
       	String first = str.substring(0, 1);
       	String last = str.substring(str.length() - 1);
       	if (!first.equals(last))
            	return false;
       	else
            	return check_Palindrome(str.substring(1, str.length() - 1));
 	}
}

Application of the substring() process

Substring extraction is used in many processes, including the retrieval of prefixes and suffixes. Retrieving the last name from a name, for example, or withdrawing only a number from a string that involves both the sum and the currency symbol. Just below following one is clarified:

public class Application_demo {
	public static void main(String args[])
	{
  
    	// Initializing String
    	String Str = new String("Rs 15000");
  
    	// Printing original string
    	System.out.print("The original string is : ");
    	System.out.println(Str);
  
    	// using substring() to extract substring
    	// returns 5000
    	System.out.print("The extracted substring is : ");
    	System.out.println(Str.substring(4));
	}
}

The output retrieved will be:

The extracted substring is: 5000

Thus, in this way; the substring java process is utilized and implemented easily which consumes less time and gives you an efficient result. So, leave us a comment if you have any queries and we’ll approach you soon!

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