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Engineering LibreTexts

6.13: Java Examples

  • Page ID
    10683
  • Arrays

    // This program demonstrates array processing, including:
    // display, total, max, min, parallel arrays, sort
    // multidimensional arrays, and dynamic arrays.
    
    import java.util.*;
    
    class Main {
        public static void main(String[] args) {
            String[] names = {"Lisa", "Michael", "Ashley", "Jacob", "Emily"};
            int[] ages = {49, 48, 26, 19, 16};
    
            displayArray(ages);
    
            int total = sum(ages);
            int maximum = max(ages);
            int minimum = min(ages);
    
            System.out.println("total: " + total);
            System.out.println("maximum: " + maximum);
            System.out.println("minimum: " + minimum);
    
            displayParallel(names, ages);
    
            Arrays.sort(ages);
            displayArray(ages);
    
            displayMultidimensional();
            dynamicArray();
        }
    
        public static void displayArray(int[] array) {
            for (int index = 0; index < array.length; index++) {
                System.out.println("array[" + index + "] = " + array[index]);
            }
        }
    
        public static int sum(int[] array) {
            int total = 0;
            for (int index = 0; index < array.length; index++) {
                total += array[index];
            }
            return total;
        }
    
        public static int max(int[] array) {
            int maximum = array[0];
            for (int index = 1; index < array.length; index++) {
                if (maximum < array[index]) {
                    maximum = array[index];
                }
            }
            return maximum;
        }
    
        public static int min(int[] array) {
            int minimum = array[0];
            for (int index = 1; index < array.length; index++) { if (minimum > array[index]) {
                    minimum = array[index];
                }
            }
            return minimum;
        }
    
        public static void displayParallel(String[] names, int[] ages) {
            for (int index = 0; index < names.length; index++) {
                System.out.println(names[index] + " is " + 
                    ages[index] + " years old");
            }
        }
    
        public static void displayMultidimensional() {
            String[][] game = {
                {"X", "O", "X"}, 
                {"O", "O", "O"}, 
                {"X", "O", "X"} };
    
            for (int row = 0; row < 3; row++) {
                for (int column = 0; column < 3; column++) {
                    System.out.print(game[row][column]);
                    if (column < 2) {
                        System.out.print(" | ");
                    }
                }
                System.out.println();
            }
        }
    
        public static void dynamicArray() {
            ArrayList<Integer> array = new ArrayList<Integer>();
    
            for (int index = 0; index < 5; index++) {
                int number = (int) Math.floor(Math.random() * 100);
                array.add(number);
            }
            System.out.println(array);
        }
    }
    

    Output

    array[0] = 49
    array[1] = 48
    array[2] = 26
    array[3] = 19
    array[4] = 16
    total: 158
    maximum: 49
    minimum: 16
    Lisa is 49 years old
    Michael is 48 years old
    Ashley is 26 years old
    Jacob is 19 years old
    Emily is 16 years old
    array[0] = 16
    array[1] = 19
    array[2] = 26
    array[3] = 48
    array[4] = 49
    X | O | X
    O | O | O
    X | O | X
    [49, 83, 75, 13, 17]