Java string function program

In java, objects of String are immutable which means a constant and cannot be changed once created. so, in technical terms, the basic Java String is basically an array of characters.

import java.io.*;
class TenString
{
public static void main(String args[]) throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter the String: ");
String str =br.readLine();
   System.out.println("Char at 3rd Position: "+str.charAt(2));
   System.out.println("Index of u: "+str.indexOf('u'));
   System.out.println("Length of String: "+str.length());
   System.out.println("Substring: "+str.substring(3));
   System.out.println("String in lower case: "+str.toLowerCase());
   System.out.println("String in upper case: "+str.toUpperCase());
   System.out.println("After removing Whitespaces: "+str.trim());
String str1="www.";
String s1 = String.valueOf(str1);    
       System.out.println("After adding www. in Starting of the string: "+s1+str);
       System.out.println("Check String is equals to the EDUNEWS: "+str.equalsIgnoreCase("EDUNEWS"));
       System.out.println("After replacing e with a: "+str.replace('e','a'));
}
}

Program Output:

Enter the String: edunews
Char at 3rd Position: u
Index of u: 3
Length of String: 7
Substring: news
String in lower case: edunews
String in upper case: EDUNEWS
After removing Whitespace: edunews
After adding www. in Starting of the string: www.edunews
Check String is equals to the EDUNEWS: true
After replacing e with a: adunews

I hope this post helps you to understand the “Java string functions” and its implementation in Java programming language.

Keep coding 🙂