Java Generic Functions: How to Write Type-Safe Code

In Java, generic functions (also known as generic methods) allow you to write methods that can work with multiple types without sacrificing type safety.

In this example, we define a generic function printArray that takes an array of any type T. We then use a for-each loop to iterate over the array and print each element to the console. In the main method, we create an array of integers and an array of strings, and call the printArray function for each array. Since we've specified that the function should work with any type, the compiler will ensure that we don't accidentally pass in an array of the wrong type. This helps to prevent runtime errors and makes our code more reliable.

Note that you can use type parameters to specify the constraints on the types that the generic function can work with. You can also use bounded type parameters to further restrict the set of allowable types. Overall, generic functions are a powerful feature of Java that can make your code more flexible, type-safe, and easier to read and maintain.