Thread: I need help on creating a method to handle minimum and maximum input values

hi I need help with this home work my code seems to be working fine but I'm having problems on finding out how to handle the minimum and maximum values. I need to have my program calculate the minimum and maximum values user inputs but cant find a way to do that, it should be written as a method.

this is what I have as a code:

import java.io.*;
import java.lang.Math;
import java.lang.Double;
import java.util.Scanner;
 
public class LabFive
{
 
  public static void main (String [] arguments)throws IOException
  {
    Scanner keyboard = new Scanner (System.in);
 
    //Declare variables
    String operator, userInput1, userInput2;
    double number1, number2;
    boolean userWantsToContinue = true, flag = true;
 
    //accumulators
 
    int additionCounter, subtractionCounter, multiplicationCounter;
    int divisionCounter, modulusCounter, powerCounter, totalCounter; 
 
    // Set accumulators to 0
    additionCounter = 0;
    subtractionCounter = 0;
    multiplicationCounter = 0;
    divisionCounter = 0;
    modulusCounter = 0;
    powerCounter = 0;
 
    //Prompt user for file Name
    System.out.println( "Enter File Name: ");
    String outputFileName = keyboard.nextLine();
    final boolean OVERWRITE = false;
    final boolean APPEND = true;
    FileWriter outputFileWriter = new FileWriter( outputFileName , APPEND );
    PrintWriter outputPrintWriter = new PrintWriter( outputFileWriter );
 
    do 
    {
      //Prompt user for operation and numbers
      System.out.print(" Enter first number: ");
      userInput1 = keyboard.nextLine();
      System.out.print(" Choose operation to be performed: + , - , * , / , or ^" 
                         + "\n" + "(Hit <E> to exit)" 
                         + "\n" + "(Hit <H> for Help)");
      operator = keyboard.nextLine ();
      System.out.print(" Enter Second number: ");
      userInput2 = keyboard.nextLine (); 
 
      number1 = Double.parseDouble(userInput1 );
      number2 = Double.parseDouble(userInput2 );
 
      if (operator.equalsIgnoreCase("H") && operator.trim().length()>0)
      {
        System.out.print("1- Enter first number for operation"
                           + "\n" + "2- Enter operator:"
                           + "\n" + "<+> to add"
                           + "\n" + "<-> to subtract"
                           + "\n" + "<*> to multiply"
                           + "\n" + "</> to divide"
                           + "\n" + "<%> to get the remainder of a division"
                           + "\n" + "<^> to raise the first number to the power of the second number"
                           + "\n" + "3- Enter second number for operation"
                           + "\n" + "Or enter <E> to exit");
      }
      if (operator.equalsIgnoreCase("+") && operator.trim().length()>0)
      {
        additionCounter = additionCounter +1;
        System.out.print(number1 + " + " + number2 + " = " 
                           + "\n" + computeAddition(number1, number2) + "\n" );
      }
      if (operator.equalsIgnoreCase("-") && operator.trim().length()>0)
      {
        subtractionCounter = subtractionCounter +1;
        System.out.print(number1 + "-" + number2 + "="
                           + "\n" + computeSubtraction(number1, number2) + "\n" );
      }
      if (operator.equalsIgnoreCase("*")&& operator.trim().length()>0)
      {
        multiplicationCounter = multiplicationCounter +1;
        System.out.print(number1 + "*" + number2 + "="
                           + "\n" + computeMultiplication(number1, number2) + "\n" );
      }
      if (operator.equalsIgnoreCase("/") && operator.trim().length()>0)
      {
        divisionCounter = divisionCounter +1;
        if (number2 >=1)
        {
          System.out.print(number1 + "/" + number2 + "="
                             + "\n" + computeDivision(number1, number2) + "\n" );
        }else if (number2 == 0)
        {
          System.out.println("Error: Operation cannot be performed with second number as zero, please try again");
          while(flag)
          {
            System.out.println("Enter second number");
            number2 = keyboard.nextDouble ();
            if(number2>=1)
            {
              System.out.print(number1 + "/" + number2 + "="
                                 + "\n" + computeDivision(number1, number2) + "\n" );
              flag=false;
            }else if(number2 ==0)
            {
              System.out.println("Error: Operation cannot be performed with second number as zero, please try again");
            }
          }
        }
      }
      if (operator.equalsIgnoreCase("%"))
      {
        modulusCounter = modulusCounter +1;
        if (number2 >=1)
        {
          System.out.print(number1 + "%" + number2 + "="
                             + "\n" + computeModulus(number1, number2) + "\n" );
        }else if (number2 == 0)
        {
          System.out.println("Error: Operation cannot be performed with second number as zero, please try again");
          while(flag)
          {
            System.out.println("Enter second number");
            number2 = keyboard.nextDouble ();
            if(number2>=1)
            {
              System.out.print(number1 + "%" + number2 + "="
                                 + "\n" + computeModulus(number1, number2) + "\n" );
              flag=false;
            }else if(number2 ==0)
            {
              System.out.println("Error: Operation cannot be performed with second number as zero, please try again");
            }
          }
        }
      }
      if (operator.equalsIgnoreCase("^"))
      {
        powerCounter = powerCounter +1;
        System.out.print(number1 + "^" + number2 + "="
                           + "\n" + computePower(number1, number2) + "\n" );
      }
      else userWantsToContinue = false;    
    }while (userWantsToContinue = true && (!operator.equalsIgnoreCase("E") && operator.trim().length()>0));
 
    // Statistics printout
    totalCounter = (additionCounter + subtractionCounter + multiplicationCounter + divisionCounter + modulusCounter);
 
    System.out.println ("Total number of additions performed: " + additionCounter);
    System.out.println ("Total number of subtractions performed: " + subtractionCounter);
    System.out.println ("Total number of multiplications performed: " + multiplicationCounter);
    System.out.println ("Total number of divisions performed: " + divisionCounter);
    System.out.println ("Total number of modulus operations performed: " + modulusCounter);
    System.out.println ("Total number of exponential operations performed: " + powerCounter);
    System.out.println ("Total number of operations performed: " + totalCounter);
  }
 
  public static double computeAddition( double number1, double number2)
  {
    return (number1 + number2);
  }
  public static double computeSubtraction( double number1, double number2)
  {
    return (number1 - number2);
  }
  public static double computeMultiplication( double number1, double number2)
  {
    return (number1 * number2);
  }
  public static double computeDivision( double number1, double number2)
  {
    return (number1 / number2);
  }
  public static double computeModulus( double number1, double number2)
  {
    return (number1 % number2);
  }
  public static double computePower(double number1, double number2)
  {
    return Math.pow(number1, number2); 
  }
 
}

--- Update ---

this is the code with the solution:

 
import java.io.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.lang.Math;
import java.lang.Double;
import java.util.Scanner;
 
public class LabFive
{
 
  public static void main (String [] arguments)throws IOException
  {
    Scanner keyboard = new Scanner (System.in);
 
    //Declare variables
    String operator, userInput1, userInput2;
    double number1, number2;
    boolean userWantsToContinue = true, flag = true;
 
    //accumulators
 
    int additionCounter, subtractionCounter, multiplicationCounter;
    int divisionCounter, modulusCounter, powerCounter, totalCounter; 
 
    // Set accumulators to 0
    additionCounter = 0;
    subtractionCounter = 0;
    multiplicationCounter = 0;
    divisionCounter = 0;
    modulusCounter = 0;
    powerCounter = 0;
 
    //Prompt user for file Name
    System.out.println( "Enter File Name: ");
    String outputFileName = keyboard.nextLine();
    final boolean OVERWRITE = false;
    final boolean APPEND = true;
    FileWriter outputFileWriter = new FileWriter( outputFileName , APPEND );
    PrintWriter outputPrintWriter = new PrintWriter( outputFileWriter );
 
    //Add list to hold all user inputs
    List<Double> userInputsList = new ArrayList<>();
 
    do 
    {
      //Prompt user for operation and numbers
      System.out.print(" Enter first number: ");
      userInput1 = keyboard.nextLine();
      System.out.print(" Choose operation to be performed: + , - , * , / , or ^" 
                         + "\n" + "(Hit <E> to exit)" 
                         + "\n" + "(Hit <H> for Help)");
      operator = keyboard.nextLine ();
      System.out.print(" Enter Second number: ");
      userInput2 = keyboard.nextLine (); 
 
      number1 = Double.parseDouble(userInput1 );
      number2 = Double.parseDouble(userInput2 );
 
      //Add userInputs to the List
      userInputsList.add(number1);
      userInputsList.add(number2);
      if (operator.equalsIgnoreCase("H") && operator.trim().length()>0)
      {
        System.out.print("1- Enter first number for operation"
                           + "\n" + "2- Enter operator:"
                           + "\n" + "<+> to add"
                           + "\n" + "<-> to subtract"
                           + "\n" + "<*> to multiply"
                           + "\n" + "</> to divide"
                           + "\n" + "<%> to get the remainder of a division"
                           + "\n" + "<^> to raise the first number to the power of the second number"
                           + "\n" + "3- Enter second number for operation"
                           + "\n" + "Or enter <E> to exit");
      }
      if (operator.equalsIgnoreCase("+") && operator.trim().length()>0)
      {
        additionCounter = additionCounter +1;
        System.out.print(number1 + " + " + number2 + " = " 
                           + "\n" + computeAddition(number1, number2) + "\n" );
      }
      if (operator.equalsIgnoreCase("-") && operator.trim().length()>0)
      {
        subtractionCounter = subtractionCounter +1;
        System.out.print(number1 + "-" + number2 + "="
                           + "\n" + computeSubtraction(number1, number2) + "\n" );
      }
      if (operator.equalsIgnoreCase("*")&& operator.trim().length()>0)
      {
        multiplicationCounter = multiplicationCounter +1;
        System.out.print(number1 + "*" + number2 + "="
                           + "\n" + computeMultiplication(number1, number2) + "\n" );
      }
      if (operator.equalsIgnoreCase("/") && operator.trim().length()>0)
      {
        divisionCounter = divisionCounter +1;
        if (number2 >=1)
        {
          System.out.print(number1 + "/" + number2 + "="
                             + "\n" + computeDivision(number1, number2) + "\n" );
        }else if (number2 == 0)
        {
          System.out.println("Error: Operation cannot be performed with second number as zero, please try again");
          while(flag)
          {
            System.out.println("Enter second number");
            number2 = keyboard.nextDouble ();
            if(number2>=1)
            {
              System.out.print(number1 + "/" + number2 + "="
                                 + "\n" + computeDivision(number1, number2) + "\n" );
              flag=false;
            }else if(number2 ==0)
            {
              System.out.println("Error: Operation cannot be performed with second number as zero, please try again");
            }
          }
        }
      }
      if (operator.equalsIgnoreCase("%"))
      {
        modulusCounter = modulusCounter +1;
        if (number2 >=1)
        {
          System.out.print(number1 + "%" + number2 + "="
                             + "\n" + computeModulus(number1, number2) + "\n" );
        }else if (number2 == 0)
        {
          System.out.println("Error: Operation cannot be performed with second number as zero, please try again");
          while(flag)
          {
            System.out.println("Enter second number");
            number2 = keyboard.nextDouble ();
            if(number2>=1)
            {
              System.out.print(number1 + "%" + number2 + "="
                                 + "\n" + computeModulus(number1, number2) + "\n" );
              flag=false;
            }else if(number2 ==0)
            {
              System.out.println("Error: Operation cannot be performed with second number as zero, please try again");
            }
          }
        }
      }
      if (operator.equalsIgnoreCase("^"))
      {
        powerCounter = powerCounter +1;
        System.out.print(number1 + "^" + number2 + "="
                           + "\n" + computePower(number1, number2) + "\n" );
      }
      else userWantsToContinue = false;    
    }while (userWantsToContinue = true && (!operator.equalsIgnoreCase("E") && operator.trim().length()>0));
 
    // Statistics printout
    totalCounter = (additionCounter + subtractionCounter + multiplicationCounter + divisionCounter + modulusCounter);
 
    System.out.println ("Total number of additions performed: " + additionCounter);
    System.out.println ("Total number of subtractions performed: " + subtractionCounter);
    System.out.println ("Total number of multiplications performed: " + multiplicationCounter);
    System.out.println ("Total number of divisions performed: " + divisionCounter);
    System.out.println ("Total number of modulus operations performed: " + modulusCounter);
    System.out.println ("Total number of exponential operations performed: " + powerCounter);
    System.out.println ("Total number of operations performed: " + totalCounter);
 
    //Use the Collections interface to obtain the Min and Max
    System.out.print("Max input value: " + Collections.max(userInputsList));
    System.out.print("Min input value: " + Collections.min(userInputsList));
  }
 
  public static double computeAddition( double number1, double number2)
  {
    return (number1 + number2);
  }
  public static double computeSubtraction( double number1, double number2)
  {
    return (number1 - number2);
  }
  public static double computeMultiplication( double number1, double number2)
  {
    return (number1 * number2);
  }
  public static double computeDivision( double number1, double number2)
  {
    return (number1 / number2);
  }
  public static double computeModulus( double number1, double number2)
  {
    return (number1 % number2);
  }
  public static double computePower(double number1, double number2)
  {
    return Math.pow(number1, number2); 
  }
 
}

I hope this helps someone I know I was going crazy with this

just create a method of min(int i, int j) and max(int i, int j)
in min method, return the variable that has the smaller value
and in max method, return the variable with higher value