Arrays as parameter/return (declare)

public static type name(type[] name) {   // pass array parameter

public static type[] name(parameters) {   // return array

• Arrays can be passed as parameters and returned from methods.
• This method takes an array of doubles, and returns a new array of rounded ints:

public static int[] roundAll(double[] realNums) {
    int[] roundedNums = new int[realNums.length];
    for (int i = 0; i < realNums.length; i++) {
        roundedNums[i] = (int) Math.round(realNums[i]);
    }
    return roundedNums;
}

Arrays as parameter/return (call)

• Below is an example usage of the roundAll method from the previous slide:

import java.util.*; // to use Arrays

public class MyProgram {
    public static void main(String[] args) {
        double[] realNumbers = {5.5, 7.31, 8.09, -3.234234, 2.0, 0.0};
        int[] roundedNumbers = roundAll(realNumbers);
        System.out.println(Arrays.toString(roundedNumbers));
    }
    ...
}

// Output: [5, 7, 8, -3, 2, 0]