Question

Write a complete Java program called MethodTest according to the following guidelines. The main method hard-codes three integer values into the first three positions of an array of integers calls a method you write called doubleEachValue that takes an array of integers (the one whose values you hard-coded in main) as its only argument and returns an ArrayList of integers, with each value in returned ArrayList equal to double the correspondingly indexed value in the array that is passed in as the argument to this method calls a method you write called printResults that takes an ArrayList of integers as its only argument and prints on a separate lines the first, second, and third values of the ArrayList that is passed in as the argument to this method

Answer 1

Code:

import java.util.ArrayList;

class Main {

ArrayList<Integer> MethodTest(int[] arr) {

ArrayList<Integer> arrList= new ArrayList<Integer>();

arrList.add(arr[0]*2);

arrList.add(arr[1]*2);

arrList.add(arr[2]*2);

return(arrList);

}

public static void main(String[] args) {

Main m = new Main();

int[] intArr = new int[]{ 1,2,3};

ArrayList<Integer> al= m.MethodTest(intArr);

System.out.println("Elements of ArrayList: "+al);

}

}

java version "1.8.0_31"

Java(TM) SE Runtime Environment (build 1.8.0_31-b13)

Java HotSpot(TM) 64-Bit Server VM (build 25.31-b07, mixed mode)

Elements of ArrayList: [2, 4, 6]