What is the correct way to initialize a variable in Java?

The correct way to initialize a variable in Java is demonstrated by initializing a variable with the appropriate data type and value. In this case, using double variable = 10.5; correctly establishes a variable named "variable" of type double and assigns it the value 10.5, which is a valid floating-point number.

Java is a strongly typed language, which means variables must be declared with a specific data type that matches the kind of data being stored. The double type is used for decimal values, and the assignment of 10.5 confirms this because it is a valid double value.

In contrast, initializing a variable with other provided examples would lead to issues. For instance, assigning a string value to an int variable or using single quotes for a string type in Java does not adhere to the language's syntax rules. Understanding how to correctly match data types with their respective values is crucial for writing functional Java code.