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Java Programming Introduction We are going to write a function that utilizes generics Function will look like: public static > E max (E [] list)
Java Programming
Introduction
We are going to write a function that utilizes generics
Function will look like:
public static
- This takes in a generic (E) that will extends the Comparable function (see last week's lecture)
- Remember these functions show how to compare two items
- Inside your code this allows access to the E.CompareTo()
- Return a generic (E)
- Function is named max
- Input is an array of generic type E
Objective:
- This function will find and return the maximum element in the array
Main Function
- Create an array of String, Integer and Double
- Strings String[] colors = {"Red","Green","Blue"};
- Integer[] numbers = {1, 2, 3};
- Double[] circleRadius = {3.0, 5.9, 2.9};
- Pass each to the max() function that you are writing and print the output:
- Example: System.out.println(max(colors));
- Will output Red
- Example: System.out.println(max(colors));
- Regardless of type, your function will find the maximum
- String, Integer and Double already extend Comparable
TIPS
- Review how to find the maximum of something in an array
- Set maxElement to the first index
- Iterate in a for loop comparing the current element to maxElement
- If the current element of the array is greater than maxElement, update maxElement to that element
- Return maxElement
- How to do the comparison without knowing the type?
- You can call .CompareTo() which will return.
- Negative number if less than the parameter object
- Zero if equal to the parameter object
- Positive number if greater than the parameter object
- Hint: list[i].CompareTo(maxElement) > 0 will be a useful check inside your loop
- You can call .CompareTo() which will return.
- Copy the function exactly as presented
- public static
> E max (E [] list)
- public static
- You are not creating a class with generics
- Rather just a function that uses them
- Inside the function you can declare and make use of the E data type
- The E data type is a mystery to you
- But thanks to the .CompareTo() function you can figure out what the maximum element is in the array
Here is a sample output:
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