How to get first and last element in an array in java?

Question

If I have an array of doubles:

[10.2, 20, 11.1, 21, 31, 12, 22.5, 32, 42, 13.6, 23, 32, 43.3, 53, 14, 24, 34, 44, 54, 64, 15.1, 25, 35, 45, 55, 65.3, 75.4, 16, 26, 17.5,]

and I want to get the first element and last element so that

firstNum = 10.2

lastNum = 17.5

how would I do this?

question from:https://stackoverflow.com/questions/39860739/how-to-get-first-and-last-element-in-an-array-in-java

Answer 1

If you have a double array named numbers, you can use:

firstNum = numbers[0];
lastNum = numbers[numbers.length-1];

or with ArrayList

firstNum = numbers.get(0);
lastNum = numbers.get(numbers.size() - 1);