Java Split String Method-Know More

StrSplit() method allows you to break a string based on a specific Java string delimiter. Mostly the Java string split attribute will be a space or a comma(,) with which you want to break or split the string. This article will help you to understand how this java String Split method works and will guide you through some of the commonly used examples to understand how the String split method works in real-time scenarios and what are the different variations of the String split method? Let’s move on !!!!!

Java split string method

What is the Java String split() method?

The Java String class provides a few useful methods for splitting strings in different ways. One such way is by using java. lang.String#split(). The String#split() method splits a String object into substrings delimited by a given delimiter. It returns an array of String objects, each representing one of those substrings, with any empty strings at either end deleted from all elements. In other words, it removes any empty suffix from every element in an array. If there are fewer than two elements in an array, then an empty string is used as both of its suffixes; if there are no elements in the array then it is returned as both its suffixes (or more precisely, an empty array is returned). 

Examples – 

class StrSplit{

   public static void main(String []args){

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String strMain = “One, Two, Three, Four”;

     String[] arrSplit = strMain.split(“, “);

      for (int i=0; i < arrSplit.length; i++)

      {

          System.out.println(arrSplit[i]);

       }

  }

}

Output:

One

Two 

Three

Four

String Split Examples in Java

Java Programming Language provides methods and classes to manipulate strings easily. The java. lang. String class has the following common methods that use to manipulate java strings: 

1. charAt(int): To get a character at a specified index in a Java String i.e. it takes an integer as input and returns one character of a string that starts from a specified index.

2. length(): To get the length of a Java String, as input takes any type or variable where you want to store the length 

3. compareTo(String): Compares two java strings and returns an integer number (less than 0, 0 or greater than 0)

4. substring(int, int): Returns a substring from the given starting index to the ending index 

5. trim(): Trims white spaces from both ends of a Java String 

6. equals(Object): Checks if a given object is equal to the current object 

7. replaceAll(string, string):  method returns a string replacing all the sequence of characters matching regex and replacement string.

8. replaceFirst(string, string):  method replaces the first substring that matches the regex of the string with the specified text.

9. concat(string,…): method combines specified string at the end of this string. It returns a combined string. It is like appending another string.

10. join(char[],…): method concatenates the given element with the delimiter and returns the concatenated string.

String splitting is case sensitive

Let’s check two input sentences to understand how case sensitive Java String Splitting is. Consider below two sentences : 

Hp Hp University and hp hp university both should be able to get divided into individual words by Splitting with a space delimiter. But here we are not getting desired output because of case sensitivity. Java split function is case sensitive, hence it will recognize only the first sentence as correct while the rest will get treated as a single word hp hp university. 

Output: [Hp, Hp, University] and [] for second one. So in order to overcome such cases you can use another optional parameter which will help you to ignore case differences for splitting.

String splitter = new StringSplitter( ,); //Case insensitive split example 1 String splitter = new StringSplitter( , -); //Case insensitive split example 2 String splitter = new StringSplitter( Hp, , ); //Split with comma   

                                                                            delimiter                                             

String splitter = new StringSplitter(Hp, -); //Split with dash delimiter.

String Split Examples in java using regex pattern

The examples in java for splitting a string are provided below. Using a split() method of String class, you can easily break a java string based on specific delimiter patterns. There are many different ways to use Java String split function; using these best examples, we will help you understand how it works with regular expression patterns or without regex. Here is an example showing how to separate words from a sentence with spaces and replace those words with uppercase characters: 

Example 1: Strings in Java before splitting (String test = This is some sentence;) becomes (String test1 = This is some Sentence;) after splitting.

String Splitting can get messy at times

Although Java has provided a solution to string splitting, in many instances using String.split() can be unwieldy because you’re required to set your own delimiter. In other words, if you want to break a line at each instance of a hyphen (-), for example, instead of writing something like myString.split(-), you have to write myString.split(-,1) . That’s not too bad, but what if your delimiter is an open parenthesis ( )? You need yet another syntax: myString.split((,1) . And what about three or more of these? My head hurts just thinking about it. Instead, use java.util.regex.Pattern and java.util.regex.Matcher. The only downside is that it requires some additional setup code before you start parsing strings with regular expressions; however, once that’s done, it will save you from all those headaches when dealing with multiple occurrences of a character or characters within a string.

Creating your own splitting algorithm – A Step by Step Guide

When you want to break a sentence into its separate words, you could use the .split() method. However, one drawback is that it simply returns a list of strings containing each word from your string. This approach works great when you need to build up a data structure for later analysis, but if you’re just trying to read and parse strings as they are, then it can be more efficient to create your own splitting algorithm based on Regular Expressions (RegEx). What is Regular Expression? In computing, regular expressions (often called regex or regexp) are special text strings used to describe a set of characters. A regular expression can specify exactly which characters in a string should be matched, and which should not. Regular expressions originated in theoretical computer science; their first practical applications were in Unix text-processing utilities such as sed and grep.

Conclusion

String split methods are often used to break up strings into smaller parts for specific purposes, such as to create tokens from lines in an input file or to separate two words with spaces in order to assign each word its own variable in Java.

Java’s string split method has been debated for its efficiency and ease-of-use, but it remains popular for its simplicity in understanding and use.

Frequently Ask Questions(FQAs)

1. How to Create a String using Java Split Method?

Ans. In the example given below, we have split the String wherever whitespace occurred.

public class StringSplit {

    public static void main(String[] args) {

        String str = “This is an example”;

        String[] splits = str.split(“\\s”); //This regEx splits the String on the WhiteSpaces 

        for(String splits2: splits) { // we have use for each loop here

            System.out.println(splits2);

        }

    }

}

2. How to find the last occurrence of a substring in java programmatically?

Ans. 

public class lastOccurrence {

  public static void main(String[] args) {

    String myStr = “Hello people, this is program to find last occurrence.”;

    System.out.println(myStr.lastIndexOf(“occurrence”));

  }

}

Output: 43

3. String split method with replace example in java?

Ans. 

public class replaceAll {

    public static void main(String args[])

    {

        // Declaring and initialising custom input string

        String Str = new String(“Welcome to collegeAftermath”);

// Using replace to replace characters

        System.out.print(“After replacing all o with T : “);

        System.out.println(Str.replace(‘o’, ‘T’));

        // Using replace to replace characters

        System.out.print(“After replacing all e with D : “);

        System.out.println(Str.replace(‘e’, ‘D’));

    }

}

Output : 

After replacing all o with T: WelcTme tT cTllegeAftermath

After replacing all e with D: WDlcomD to collDgDAftDmath

Java Split String Method-Know More

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