InsertStringIntoAnotherString.java

// Java program to insert a string into another string 
// without using any pre-defined method 

import java.lang.*; 

class InsertStringIntoAnotherString { 

	// Function to insert string 
	public static String insertString( 
		String originalString, 
		String stringToBeInserted, 
		int index) 
	{ 

		// Create a new string 
		String newString = new String(); 

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

			// Insert the original string character 
			// into the new string 
			newString += originalString.charAt(i); 

			if (i == index) { 

				// Insert the string to be inserted 
				// into the new string 
				newString += stringToBeInserted; 
			} 
		} 

		// return the modified String 
		return newString; 
	} 

	// Driver code 
	public static void main(String[] args) 
	{ 

		// Get the Strings 
		String originalString = "Raju plays good cricket"; 
		String stringToBeInserted = "Singh "; 
		int index = 4; 

		System.out.println("Original String: "
						+ originalString); 
		System.out.println("String to be inserted: "
						+ stringToBeInserted); 
		System.out.println("String to be inserted at index: "
						+ index); 

		// Insert the String 
		System.out.println("Modified String: "
						+ insertString(originalString, 
										stringToBeInserted, 
										index)); 
	} 
}