Day 7 : Java Strings (Text Magic in Java)

Hey friends, welcome back to 100 Days of Java.
Yesterday we taught Java how to make decisions with if else.
But here’s a thought: what if you don’t just want numbers or true or false? What if you want words, names, sentences?

That’s where Strings come in.

What is a String

In Java,

• A String is simply text inside double quotes.
• Example:

String name = "Tony Stark";

Here, "Tony Stark" is a String.
Think of it this way:

• Numbers are the calculator’s language.
• Strings are the human language.

Joining Strings (Concatenation)

Concatenation means joining two strings together.

String firstName = "Tony";
String lastName = "Stark";
String fullName = firstName + " " + lastName;

System.out.println("Full Name: " + fullName);

Output:

Full Name: Tony Stark

It’s like connecting Lego blocks; you can build bigger pieces of text.

Numbers and Strings

Strings can also hold numbers as text.

String age = "30";
System.out.println("I am " + age + " years old.");

Output:

I am 30 years old.

But remember, "30" here is text, not math.
Try this:

System.out.println("10 + 20 = " + 10 + 20);

Output:

10 + 20 = 1020

Why? Because Java is treating 10 and 20 as text.
To fix it, use parentheses so Java calculates first:

System.out.println("10 + 20 = " + (10 + 20));

Output:

10 + 20 = 30

Special Characters in Strings

Sometimes you want to include quotes or a new line inside your text.
That’s where escape characters help.

• \n = new line
• \t = tab (extra spaces)
• \" = add quotes inside text

Example:

System.out.println("Hello\nWorld");
System.out.println("He said, \"I am Iron Man\"");

Output:

Hello
World
He said, "I am Iron Man"

Real-Life Example: Chat Message App

public class ChatApp {
    public static void main(String[] args) {
        String sender = "Tony";
        String message = "Meet me at Avengers Tower!";
        String time = "5 PM";

        String chat = sender + ": " + message + " (at " + time + ")";
        System.out.println(chat);
    }
}

Output:

Tony: Meet me at Avengers Tower! (at 5 PM)

It looks just like a chat message. Apps like WhatsApp or Discord use Strings everywhere for this.

Wrap Up

Today you learned:

• What Strings are
• How to join Strings
• How Strings handle numbers differently
• How to use special characters
• How to build a simple chat message app

Tomorrow we’ll go deeper into String methods counting letters, changing text to uppercase, and more.

References

• Official Java Tutorial on If Else

You can also check out:

• Learn Java Basics (Day 1) – Install JDK and Run Your First Program
• Learn Java Variables and Data Types (Day 2): Java for Beginners
• Day 3: Java Variables and Data Types Explained with Real-Life Examples
• Day 4 Java Tutorial: Scanner Input + Build a Basic Calculator
• Day 5 – Operators and Expressions in Java with Grocery Price Calculator
• Day 6 – If Else and Conditions in Java with Movie Recommendations
• Beginner’s Guide to Web Development

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