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I'm Stuck with my homework. Basically,we need to Create a program to find the largest and smallest integers in a list entered by the user.And stops when the user enters 0. However we are not allowed to user arrays for this problem.

and one more condition : If the largest value appears more than once, that value should be listed as both the largest and second-largest value, as shown in the following sample run.

I have met the first condition of the program however I cannot meet the 2nd condition.

import java.util.Scanner;
public class FindTwoLargest 
 public static void main(String args[]) 
 Scanner sc = new Scanner(System.in);
 int num = 1, max1st = 0, max2nd = 0;
 int count = 1;
 System.out.println("This program allows the user to create a list integers until the user enters 0");
 System.out.println("The program will print the Largest value and the Second largest value from the list!");
 while(num != 0) 
 System.out.print("Integer No." + count + " ");
 num = sc.nextInt();

 if(num >= max1st && num >= max2nd) 
 max1st = num;
 
 if(num >= max2nd && num < max1st) 
 max2nd = num;
 
 count++;
 
 System.out.println("The largest value is " + max1st);
 System.out.println("The second largest value is " + max2nd);

 

I have tried to use this code.

 if(num >= max2nd && num <= max1st) 
max2nd = num;
 

however when I run the program
https://imgur.com/a/YMxj9qm - this shows.

It should print 75 and 45 . What can I do to meet the first condition and meet the second condition?

If you exceed your maximum number (max1st), your new maximum number will be set to num. But your second largest number will be the current maximum number. So try this condition:

if (num > max1st) 
 max2nd = max1st;
 max1st = num;
 else if (num > max2nd) 
 max2nd = num;

Please user If else in those cases. You have used two if statements that is replacing the value of max2nd.

 import java.util.Scanner;
 public class FindTwoLargest 
 public static void main(String args[]) 
 Scanner sc = new Scanner(System.in);
 int num = 1, max1st = 0, max2nd = 0;
 int count = 1;
 System.out.println("This program allows the user to create a list integers until the user enters 0");
 System.out.println("The program will print the Largest value and the Second largest value from the list!");
 while(num != 0) 
 System.out.print("Integer No." + count + " ");
 num = sc.nextInt();

 if(num >= max1st && num >= max2nd) 
 max1st = num;
 
 else if(num >= max2nd && num < max1st) 
 max2nd = num;
 
 count++;
 
 System.out.println("The largest value is " + max1st);
 System.out.println("The second largest value is " + max2nd);

 

I changed the conditions, please take a look

import java.util.Scanner;
public class FindTwoLargest 
 public static void main(String args[]) 
 Scanner sc = new Scanner(System.in);
 int num = 1, max1st = 0, max2nd = 0;
 int count = 1;
 System.out.println("This program allows the user to create a list integers until the user enters 0");
 System.out.println("The program will print the Largest value and the Second largest value from the list!");
 num = sc.nextInt();
 while(num != 0) 
 System.out.print("Integer No." + count + " ");

 if(num > max1st) 
 if(max1st > max2nd) 
 max2nd = max1st;
 
 max1st = num;
 else 
 if(num > max2nd) 
 max2nd = num;
 
 
 count++;
 num = sc.nextInt();
 
 System.out.println("");
 System.out.println("The largest value is " + max1st);
 System.out.println("The second largest value is " + max2nd);

 

Here is a much simpler method.

import java.util.Scanner;
public class FindTwoLargest 
 public static void main(String args[]) 
 Scanner sc = new Scanner(System.in);
 int num = 1, max1st = 0, max2nd = 0;
 do
 
 num = sc.nextInt();
 max2nd = (num >= max1st) ? max1st : (num > max2nd) ? num : max2nd;
 max1st = num > max1st ? num : max1st;
 
 while(num != 0)

 System.out.println("nThe largest value is " + max1st);
 System.out.println("The second largest value is " + max2nd);

 

If you need any more explanation I will be happy to help.

You can try below approach, this should solve your issue =>

import java.util.*;
public class BackedList 

 private static Scanner sc;

 public static void main(String args[])
 sc = new Scanner(System.in);
 int num = 1;
 List<Integer> integersList = new ArrayList<Integer>();
 int count = 1;
 System.out.println("This program allows the user to create a list integers until the user enters 0");
 System.out.println("The program will print the Largest value and the Second largest value from the list!");
 while(num != 0) 
 System.out.print("Integer No." + count + " ");
 num = sc.nextInt();

 integersList.add(num);
 

 Collections.sort(integersList, Collections.reverseOrder());
 if(integersList.get(0) == integersList.get(1))
 System.out.println("The number " + integersList.get(0) + " is first largest and " 
 + integersList.get(1) + " is the second largest number");
 
 else 
 
 System.out.println("The largest number is :" + integersList.get(0) + " and the smallest one is :"
 + integersList.get(integersList.size()-1));
 
 

1. When user inputs the numbers, add them to the List,


2. Now sort the List in ascending order.


3. 
   

   The last element in List will be the maximum, and the second last
   will be the second maximum.

   
   
   

   List<Integer> List = Arrays.asList(2,5,7,90,12,56);
   List = List.stream().sorted(Integer::compareTo).collect(Collectors.toList());
   int size = List.size();
   System.out.println(List.get(size-1)+" "+List.get(size-2));
   

   
   

import java.util.Scanner;
public class FindTwoLargest 
 public static void main(String args[]) 
 Scanner sc = new Scanner(System.in);
 int num = 1, max1st = 0, max2nd = 0;
 int count = 1;
 System.out.println("This program allows the user to create a list integers until the user enters 0");
 System.out.println("The program will print the Largest value and the Second largest value from the list!");
 while(num != 0) 
 System.out.print("Integer No." + count + " ");
 num = sc.nextInt();

 if(num > max1st) 
 max2nd=max1st;
 max1st = num;
 
 else if(num == max1st ) 
 max2nd = num;
 
 count++;
 
 System.out.println("The largest value is " + max1st);
 System.out.println("The second largest value is " + max2nd);

 

you are over complicating things with && in your if. if a number is greater than 1st 1sr gets changed if a number is same as first 2nd gets changed if its not bigger or same nothing happens.