Java Statement

🏗️ Java Block Statements – Now with Extra Fun! 🎉

🤔 What is a Block Statement?

Imagine you have a to-do list. You can complete each task one by one, or you can group similar tasks together (like “groceries” or “work stuff”). Java does something similar with block statements! 🏗️

A block statement is just a bunch of Java statements wrapped up inside {} curly braces. Why? Because sometimes Java needs you to use a single statement, but you have a whole bunch of them. So, put them in a block, and boom 💥—problem solved!

📌 Example

{
    int var = 20;
    var++;
}

Simple, right? The statements inside {} are treated as one. Like a coding burrito 🌯—all ingredients wrapped up nicely together.

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🔍 Scope of Variables Inside Blocks 🕵️

Java is a bit territorial. If you declare a variable inside a block, it stays inside that block. It won’t be available outside—kind of like a top-secret club! 🤫

❌ Example of Scope Violation 🚫

{
    int var = 20;
    var++;
}

// Oh no! Java says NOPE! 🚨
System.out.println(var); // ERROR: var is out of scope!

See? var was declared inside the block, so Java refuses to acknowledge its existence outside of it. Typical Java. 😅

🏗️ Nested Blocks

You can nest blocks inside each other (like Russian dolls! 🎭). Inner blocks can access variables from outer blocks, but outer blocks cannot access variables from inner blocks. It’s like a VIP lounge—higher-ups can enter, but the interns can’t sneak into the executive suite. 😆

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🚀 Blocks During Object Creation

Here’s where things get spicy! 🌶️

Block statements don’t have to live inside methods! You can also use them inside classes to handle initialization logic.

🔥 Non-Static vs Static Blocks

• Non-static blocks → Run every time you create a new object. 🔄
• Static blocks → Run only once when the class is loaded. 🚀

Example

public class MyDemoAction {
    private Integer variable = 10;

    public MyDemoAction() {
        System.out.println("MyDemoAction Constructor");
    }

    {
        // Non-static block statement - runs every time an object is created!
        System.out.println("Hello from a non-static block! 🏗️");
    }

    static {
        // Static block statement - runs only once when the class loads!
        System.out.println("Hello from a static block! 🚀");
    }

    private void someMethod() {
        System.out.println("HowToDoInJava.com");
    }
}

💡 What Happens When You Run This?

1. The static block executes first (only once).
2. Each time you create an object, the non-static block runs before the constructor.
3. Finally, the constructor runs.

This is Java’s way of making sure certain setup tasks are done, with or without creating an object! 🎩✨

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🎯 The Takeaway

That’s all, folks! Now you know how to use block statements like a pro! 🏆

✅ Use {} to group multiple statements into one. ✅ Remember: variables inside a block stay inside the block. ✅ Static blocks run once, while non-static blocks run every time an object is created.

Hope you had fun learning! Happy coding! 🚀🎉