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]