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Find Substring In String Java Without Library Function

Last Updated : Jul 1, 2023

Find Substring In String Java Without Library Function

In this article we will show you the solution of find substring in string java without library function, the substring() method of the Java String class returns a portion of the string.

In other words, the beginIndex begins at 0 and the endIndex begins at 1. Substring methods are available in Java string in two different types.

The following conditions cause a StringIndexOutOfBoundsException to be thrown.

  • When there is a negative number as the starting index
  • Compared to the initial index, the final index is lower.

The process of extracting information from a string is referred to as substringing.

We can, for example, have a list of names that must be followed.

A substring is a segment of String. Substring is, in other words, a subset of another String.

The Java String class includes the built-in substring() method, which extracts a substring from a given string using the index values passed as arguments. computer," the substrings will be com, compu, ter, and so on.

Substring(int startIndex): public String Returns a new String object matching the startIndex specified in the call to this method.

An object containing the substring from startIndex to endIndex of the given string is returned by this method.

This can be accomplished by performing a nested loop traversal of the given string, followed by another loop checking for sub-strings beginning at each index.

BeginningIndex and endIndex are inclusive and exclusive numbers that are passed to Java's substring method.

As a result, beginning at zero and ending at one is what the beginIndex represents. As the name implies, substringing is the process of extracting information from strings.

class first{
   Public static void main(String []args) {
      string str = "root";
      System.out.println("String: "+str);
      int index = str.indexOf("first");
      System.out.printf("Substring 'root' is at index %d
", index);
   }
}
  1. First, we must create a class with a name.
  2. The next step is to create the function public static void main to begin the programme.
  3. Next, we create a string called root.
  4. We then create a substring with the name first.
  5. Finally, we close the programme with the system.out.printf function.

Conclusion :-

A substring is a segment of String. Substring is, in other words, a subset of another String.

The Java String class includes the built-in substring() method, which extracts a substring from a given string using the index values passed as arguments.

If the string is "computer," the substrings will be com, compu, ter, and so on.

I hope this article on find substring in string java without library function helps you and the steps and method mentioned above are easy to follow and implement.

Author Image About Pragati

Experienced coding content writer who enjoys breaking down complex concepts in programming languages like Java, Python, C, and C++. Over three years of experience producing interesting and relevant content for a variety of entities. Committed to providing concise and easy-to-understand articles that assist readers in easily understanding technology and industry trends in the world of coding and software development.

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