0:07 [Music]
0:09 Welcome back to Code Chef. Have you ever
0:11 written your name in a program or stored
0:14 a sentence in Java? That's when strings
0:18 come in. Java's way of handling text.
0:20 Whether it's a username, a message, or a
0:22 paragraph, strings are everywhere in
0:24 programming. Think of a string like a
0:27 necklace of beads. Each bead is a
0:29 character and the necklace represents
0:31 the whole word or sentence. Once the
0:33 necklace is made, you can admire it,
0:35 copy it, or attach it to another
0:37 necklace, but you can't change the
0:39 original beads. That's immutability in
0:43 action. In Java, a string is an object
0:44 that represents a sequence of
0:47 characters. Strings are immutable,
0:49 meaning once created, their content
0:52 cannot be changed. You can create
0:55 strings using quotes like hello or the
0:57 new string constructor and combine them
1:00 using concatenation with the plus sign.
1:02 Let's see a simple example.
1:05 Suppose we write the following code.
1:07 Java creates greeting and name as
1:10 separate strings. Concatenating them
1:12 with the plus operator produces hello
1:15 abhe and stores it in message. When we
1:18 print message, the output is exactly
1:22 hello abhe. A few quick tips.
1:24 Strings are immutable. So modifying a
1:26 string actually creates a new one.
1:29 Concatenation with plus is simple. But
1:31 if you do many concatenations in a loop,
1:33 using string builder is more efficient.
1:35 You can also combine literals,
1:37 variables, and even numbers in
1:41 concatenation. For example, age plus 21
1:46 becomes age 21. Now it's your turn. Try
1:48 the code chef problem called greeting
1:50 message. You'll read a user's name and
1:52 print a personalized greeting using
1:54 strings. The perfect way to practice
1:57 what you've learned today. You learned
1:59 that strings in Java are sequences of
2:01 characters. They're immutable by nature
2:04 and can be combined using concatenation.
2:06 These basics are essential for handling
2:09 text in all Java programs. Keep
2:12 practicing, keep coding, and remember
2:15 code. Debug, repeat. Build mastery with
