Java String in Detail | String, StringBuffer, StringBuilder | Methods Explained with Examples |

In today’s video, I have explained STRING IN JAVA in complete detail using simple English with Hinglish explanation. This video is taught in a proper teaching style so that beginners can easily understand every concept without confusion.

In this video, I started with the basic definition of String in Java. I explained that String is a sequence of characters, it is a built-in class in Java, and it is used to store and represent textual data such as names, messages, passwords, and sentences. I also explained that String is not a primitive data type but an object of the String class, and internally it stores data in the form of a character array.

After that, I explained the different ways to create a String in Java. I covered String creation using String literal and using the new keyword. I explained the concept of String Constant Pool (SCP) and heap memory, and how Java reuses objects when String literals are used, while a new object is created every time when the new keyword is used.

Then I explained the concept of String immutability. I discussed why String is immutable, what happens internally when we try to modify a String using methods like concat(), and how a new object is created instead of modifying the existing one.

Next, I explained how a String can be created using a character array and how Java internally converts a char array into a String object.

After that, I explained the CharSequence interface and discussed how it is implemented by String, StringBuffer, and StringBuilder. I clearly explained the difference between immutable and mutable strings.

I explained String, StringBuffer, and StringBuilder individually along with their syntax, examples, performance, and thread safety. I also compared String vs StringBuffer vs StringBuilder so that learners can understand when to use which one.

Finally, I explained important Java String class methods such as length(), charAt(), concat(), equals(), equalsIgnoreCase(), compareTo(), isEmpty(), toUpperCase(), toLowerCase(), trim(), replace(), substring(), contains(), startsWith(), endsWith(), indexOf(), lastIndexOf(), split(), valueOf(), toCharArray(), intern(), matches(), join(), format(), getBytes(), and hashCode() with proper explanation.

This video is useful for Java beginners, BCS/BCA/MCA students, exam preparation, viva, and interview preparation. Language used in this video is English with Hinglish for easy understanding.