text: Java program to extract a substring from a string :
  In this Java programming tutorial, we will learn how to extract a substring from a user given string. The program will ask the user to enter a string and first and the second index of the substring. Then it will print out the substring of that string. Let’s take a look at the program :
  Java program :
  import java.util.*; public class Main { public static void main(String[] args) { //1 Scanner scanner = new Scanner(System.in); String inputString; //2 int startIndex; int endIndex; //3 System.out.println("Enter a string : "); inputString = scanner.nextLine(); //4 System.out.println("Enter the first index of the substring : "); startIndex = scanner.nextInt(); //5 System.out.println("Enter the second index of the substring : "); endIndex = scanner.nextInt(); //6 char[] ch = new char[endIndex - startIndex + 1]; inputString.getChars(startIndex, endIndex + 1, ch, 0); //7 System.out.println("Output : " + String.valueOf(ch)); } }
  Explanation :
  The commented numbers in the above program denote the step numbers below :
  - Create one Scanner object to read the user input values.Create one string inputString to store the user input string.
  - Create two variables to store the start and end index of the substring.
  - Ask the user to enter a string. Scan it and store it in inputString variable.
  - Ask the user to enter the first index , read and store it in startIndex variable.
  - Ask the user to enter the end index, read and store it in endIndex variable.
  - Create one character array ch to read and store the substring as character array.For this we are using getChars method.It takes 4 arguments : First one is the start index of the substring.
  * Second one is the ending index of the string. If we pass _5_ as ending index, it will get the sub array up to _4th_ index. * Third one is the character array to store the sub array. * Fourth one is the starting index of the _character array_ where we are storing.
  - Finally, convert the character array to a string using String.valueOf() and print out the string.
  Sample output :
  Enter a string : hello Enter the first index of the substring : 1 Enter the second index of the substring : 4 Output : ell Hello World Enter the first index of the substring : 1 Enter the second index of the substring : 6 Output : ello W
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