Thread: BlueJ program !

I need help !! I have to write a program. The program first takes inputs (i.e., numeric values) supplied by users using a letter as
sentinel value, and places them into an arraylist. It then displays all the elements of the arraylist,
and marks the largest and the smallest. I tried doing it but it wont compile. Does anyone have a solution to this please ?

Post what you tried with the errors. Please read the Announcement topic at the top of the sub-forum to learn how to post code in code or highlight tags and other useful info for newcomers.

import java.util.ArrayList;
import java.util.Scanner;

public class FindLargestValueInArrayList
{
public static void main(String[] args)
{
// Make sure you use Double instead of double to specify the data type
// of the elements in the array
ArrayList<Double> values = new ArrayList<
Double>();

// In fact, for the following code, as long as you put a non-double input,
// it will stop adding data to the arraylist.
System.out.println("Please enter value, Q to quit:");
Scanner in = new Scanner(System.in);
while (in.hasNextDouble())
{
values.add(in.nextDouble()); //We use the add method to add an element to the values arraylist.
}

// Find the largest value and store it in a variable called largest.
// Find the smallest value and store it in a variable called smallest.
double largest = values.get(0);
// We go over every element in the arraylist, starting from the second element.
for(int i = 1; i < values.size(); i++)
{
if (values.get(i) > largest)
{
largest = values.get(i);
}
}

double smallest = values.get(0);
// We go over every element in the arraylist, starting from the second element.
for(int i = 1; i < values.size(); i++)
{
if (values.get(i) > smallest)
{
smallest = values.get(i);
}
}


// Print all values, marking the largest
// Print all values, marking the smallest
// Now let us go over every element in the values arraylist
for (double element : values)
{
System.out.print(element);
// Evaluate whether or not the element is the largest value.
// If yes, we print "==> largest value" that follows the element.
// Evavluate whether or not the element is the smallest value.
// If yes, we print "==> smallest value" that follows the element.
if (element == largest)
{
System.out.print(element);
// Evaluate wheteher or not the element is the largest value.
// If yes, we print "==> largest value" that follows the element.
if (element == largest)
{
System.out.print(" <== largest value");
}
System.out.println();

if (element == smallest)
{
System.out.print(element);
// Evaluate wheteher or not the element is the smallest value.
// If yes, we print "==> smallest value" that follows the element.
if (element == smallest)
{
System.out.print(" <== smallest value");
}
System.out.println();
}
}
}
}

}

--- Update ---

This code is for a different problem. Im trying to find the largest value and smallest value using the arraylist. It does compile but the largest value and the smallest value are the same thing.

I guess you didn't bother to read the link I directed you to. You can still do that and then edit your posted code to be more readable.

This code is for a different problem. Have to find the largest value and the smallest value. But when I compile the program the largest and the samllest are the same value. Something is wrong but I cant figure it out. Please help.

--- Update ---

I did read the link. I don't understand where Im supposed to post it at.

Reread the link, item number 1. Post any part of that item you don't understand and need explained further. If you figure it out on a second read, then apply it.

Think about this statement:

if ( values.get( i ) > smallest )

Does that make sense?