Скачать или смотреть 🤯 Java Trick: What Happens When You Add "Java" to null?

In this short, let’s explore a tricky Java question that often surprises developers —
what happens when you concatenate "Java" with a null string? 🤔

Code:

public class Test {
public static void main(String[] args) {
String s = null;
System.out.println(s + "Java");
}
}


👉 Output:

nullJava


💡 Explanation:

When you use + with a string, Java automatically converts the other operand to a string.

Since s is null, it becomes the literal "null" before concatenation.

So, "null" + "Java" → "nullJava"

✅ Key Concept:
String concatenation in Java uses StringBuilder internally, and null is treated as the string "null" during conversion.

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