Automatic variable have to be initialized explicitly.

In Core Java, automatic variables, also known as local variables, are not automatically initialized. Automatic variables are variables declared within a method, constructor, or block of code. They don’t receive default values like class variables (instance or static variables) do.

If you declare an automatic variable without explicitly initializing it, you’ll need to provide an initial value before attempting to use it. Otherwise, the compiler will generate an error. Here’s an example:

java

public class Example {

public void someMethod() {

// Automatic variable

int x;

// Attempting to use x without initializing it will result in a compilation error
// System.out.println(x); // Uncommenting this line would cause a compilation error

// Initializing x before use
x = 10;
System.out.println(x); // This is now valid
}
}

In the example above, attempting to use the variable x without initializing it would result in a compilation error. Therefore, it’s the responsibility of the programmer to ensure that automatic variables are initialized before they are used.