The document outlines a Java program that includes methods for generating a list of random integers, finding the smallest and largest numbers, computing the average, and identifying unique numbers from an array. The main function demonstrates these functionalities by printing the generated list, its statistics, and the unique numbers obtained from it. Key methods in the class include 'uniquenumbers', 'smallestnumber', 'largestnumber', and 'averageofnumbers'.

1. Write a method called uniqueNumbers that takes an int array as parameter, and returns a
different int array, which only contains the list of unique numbers in the original array. Hint: Use
the isPresent method defined below to accomplish your
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Solution
solution
package com.mt.classes;
import java.util.ArrayList;
import java.util.List;
public class Lab8e {
public static void main(String[] args) {
int[] numbers = new int[20];
// Generate random numbers between 0 and 99 and fill up the array
for (int i = 0; i < numbers.length; i++) {
numbers[i] = (int) (Math.random() * 50);
}
System.out.println("The list is:");
printNumbers(numbers);
// Task 1
System.out.println("The smallest number in the list is "
+ smallestNumber(numbers));
// Task 2
System.out.println("The largest number in the list is "
+ largestNumber(numbers));
// Task 3
System.out.println("The average of numbers in the list is "
+ averageOfNumbers(numbers));
// Task 4: Extra Credit. Uncomment the following
// two lines if you complete this task.
System.out.println("The list of unique numbers is:");
uniqueNumbers(numbers);
}
private static void uniqueNumbers(int[] numbers) {

2. for (int i = 0; i < numbers.length; i++) {
boolean isDuplicate = false;
for (int j = 0; j < i; j++) {
if (numbers[i] == numbers[j]) {
isDuplicate = true;
break;
}
}
if (!isDuplicate) {
System.out.print(numbers[i] + " ");
}
}
}
public static void printNumbers(int[] list) {
for (int i = 0; i < list.length; i++) {
System.out.print(list[i] + " ");
}
System.out.println();
}
// 1. Write a method called smallestNumber that
// takes an int array as parameter, and returns the
// smallest number
public static int smallestNumber(int[] list) {
int small = 100;
for (int i = 0; i < list.length; i++) {
if (list[i] < small) {
small = list[i];
}
}
return small;
}
// 2. Write a method called largestNumber that
// takes an int array as parameter, and returns the
// largest number
public static int largestNumber(int[] list) {
int large = 0;

3. for (int i = 0; i < list.length; i++) {
if (list[i] > large) {
large = list[i];
}
}
return large;
}
// 3. Write a method called averageOfNumbers that
// takes an int array as parameter, and returns the
// average of the numbers
public static double averageOfNumbers(int[] list) {
double average = 0.0;
for (int i = 0; i < list.length; i++) {
average = average + list[i];
}
average = average / list.length;
return average;
}
public static boolean isPresent(int[] list, int target) {
boolean found = false;
for (int i = 0; i < list.length && !found && list[i] != 0; i++) {
if (list[i] == target) {
found = true;
}
}
return found;
}
}
output
The list is:
16 14 11 31 7 8 18 49 27 43 9 39 38 18 6 16 8 30 32 15
The smallest number in the list is 6
The largest number in the list is 49
The average of numbers in the list is 21.75
The list of unique numbers is:
16 14 11 31 7 8 18 49 27 43 9 39 38 6 30 32 15