# How do I display the smallest number in a collection?

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I am new to Java. I want to display the smallest number in the collection?

This is what I have so far:

import java.util.ArrayList;

public class Numbers {
private ArrayList<Double> numbers;

public Numbers() {
numbers = new ArrayList<Double>();
}

/**
*Add a number to the collection in a client specified position or at the end of the collection
*/
{
}

/**
* Display all numbers in the collection
*/
public void displayNumbers()
{
int number = 0;

while (number < numbers.size()) {
System.out.println(numbers.get(number));
number++;
}
}

/**
* Display all numbers in the collection organized in 2 categories, first the positive numbers, second the
*negative numbers
*/
public void displayNumbersInCategories()
{
System.out.println("Positive Numbers");

int number = 0;

while (number < numbers.size()) {
if (numbers.get(number) >= 0.0) {
System.out.println(numbers.get(number));
}

number++;
}

System.out.println("Negative Numbers");

for (Double aNumber : numbers) {
if (aNumber < 0.0) {
System.out.println(aNumber);
}
}
}

/**
* Display the sum of all numbers in the collection
*/
public void displaySum()
{
double sum = 0.0;
int length = this.numbers.size();
int counter = 0;

while (counter < length) {
sum = sum + this.numbers.get(counter);
counter++;
}

System.out.println(sum);
}

/**
* Display 2 sums: the sum of all positive numbers in the collection and the sum of all negative numbers in
* the collection
*/
public void displaySumsInCategories()
{
double sum = 0.0;
int length = this.numbers.size();
int counter = 0;
System.out.println("Positive Numbers");

while (counter < length)
{
sum = sum + this.numbers.get(counter);
counter++;
}

System.out.println(sum);
//}
System.out.println("Negative Numbers");

for (Double aSum : numbers)
{
if (aSum < 0.0)
{
System.out.println(aSum);
}
}
}

/**
* Display the average of all the positive numbers
*/

public void displayPositiveAvg()
{
double sum = 0.0;
int count = 0;
for(Double number : numbers)
{
if(number > 0.0)
{
sum += number;
count++;
}
}

System.out.println("Average is " + (sum / count));
}
}

/**
* Display the smallest number in the collection
*/

public void displaySmallestNumber()
for(count = 0; count < max; count++)
{
if(value < smallest)
value = smallest
}
else{
//do nothing
}
System.out.println("value" + smallest)
}
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EXPERT OFFICE® is a registered trademark of EXPERTS EXCHANGE®
Expert of the Quarter 2010
Expert of the Year 2010

Commented:

``````/**
* Display the smallest number in the collection
*/

public void displaySmallestNumber()
Double smallest = Double.MAX_VALUE;
for (Double aNumber : numbers) {
if (smallest < aNumber) {
smallest = aNumber;
}
}
System.out.println("value " + smallest)
}
``````
Expert of the Quarter 2010
Expert of the Year 2010

Commented:

``````/**
* Display the smallest number in the collection
*/

public void displaySmallestNumber()
Double smallest = Double.MAX_VALUE;
for (Double aNumber : numbers) {
if (aNumber < smallest) {  // wrong in last post
smallest = aNumber;
}
}
System.out.println("value " + smallest)
}
``````

Commented:
Thanks but for some reason mine is not compiling

Commented:
You could also modify the addNumber method so that it inserts the numbers into a sorted arrayList. Then you would just return the first index for the getSmallest.
``````public void addNumber(double number)
{
for(int count = 0; count < numbers.size(); count++){
if(number < numbers.get(count)){
return;
}
}
}
``````

Commented:
This is my entire chunk of code that i got to compile.
``````import java.util.ArrayList;

public class Numbers {
private ArrayList<Double> numbers;

public static void main(String[] args) {
Numbers n = new Numbers();
n.displayNumbers();

}

public Numbers() {
numbers = new ArrayList<Double>();
}

/**
*Add a number to the collection in a client specified position or at the end of the collection
*/
{
for(int count = 0; count < numbers.size(); count++){
if(number < numbers.get(count)){
return;
}
}
}

/**
* Display all numbers in the collection
*/
public void displayNumbers()
{
int number = 0;

while (number < numbers.size()) {
System.out.println(numbers.get(number));
number++;
}
}

/**
* Display all numbers in the collection organized in 2 categories, first the positive numbers, second the
*negative numbers
*/
public void displayNumbersInCategories()
{
System.out.println("Positive Numbers");

int number = 0;

while (number < numbers.size()) {
if (numbers.get(number) >= 0.0) {
System.out.println(numbers.get(number));
}

number++;
}

System.out.println("Negative Numbers");

for (Double aNumber : numbers) {
if (aNumber < 0.0) {
System.out.println(aNumber);
}
}
}

/**
* Display the sum of all numbers in the collection
*/
public void displaySum()
{
double sum = 0.0;
int length = this.numbers.size();
int counter = 0;

while (counter < length) {
sum = sum + this.numbers.get(counter);
counter++;
}

System.out.println(sum);
}

/**
* Display 2 sums: the sum of all positive numbers in the collection and the sum of all negative numbers in
* the collection
*/
public void displaySumsInCategories()
{
double sum = 0.0;
int length = this.numbers.size();
int counter = 0;
System.out.println("Positive Numbers");

while (counter < length)
{
sum = sum + this.numbers.get(counter);
counter++;
}

System.out.println(sum);
//}
System.out.println("Negative Numbers");

for (Double aSum : numbers)
{
if (aSum < 0.0)
{
System.out.println(aSum);
}
}
}

/**
* Display the average of all the positive numbers
*/

public void displayPositiveAvg()
{
double sum = 0.0;
int count = 0;
for(Double number : numbers)
{
if(number > 0.0)
{
sum += number;
count++;
}
}

System.out.println("Average is " + (sum / count));
}
``````
Expert of the Quarter 2010
Expert of the Year 2010
Commented:
> not compiling

That would be because of a missing { and ;
``````/**
* Display the smallest number in the collection
*/

public void displaySmallestNumber() {
Double smallest = Double.MAX_VALUE;
for (Double aNumber : numbers) {
if (aNumber < smallest) {  // wrong in last post
smallest = aNumber;
}
}
System.out.println("value " + smallest);
}
``````
Project manager

Commented:
This question has been classified as abandoned and is being closed as part of the Cleanup Program.  See my comment at the end of the question for more details.

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