Commit 89cd40de authored by Christopher Bohn's avatar Christopher Bohn 🤔
Browse files

Added example to demonstrate type casting and method overloading

parent b46f356e
package edu.unl.cse.soft160.statistics;
import java.util.Scanner;
/**
* Computes simple statistics of three values
*/
public class GeneralizedStatistics {
public enum StatisticsType {
MEAN, MEDIAN, // to keep this example shorter, we're omitting maximum and minimum
}
private static String getUserInput(String prompt, Scanner scanner) {
System.out.print(prompt);
String userInput = scanner.nextLine();
return userInput;
}
private static Number getValue(String ordinal, Scanner scanner) {
String userInput = getUserInput("Enter the " + ordinal + " value: ", scanner);
if (userInput.contains(".")) {
return Double.valueOf(userInput);
} else {
return Integer.valueOf(userInput);
}
}
private static StatisticsType getStaticsticsType(Scanner scanner) {
String userInput = getUserInput("Please enter the statistic to calculate: ", scanner);
userInput = userInput.toUpperCase();
StatisticsType statisticsType = StatisticsType.valueOf(userInput);
return statisticsType;
}
private static double computeMean(double firstValue, double secondValue, double thirdValue) {
double statistic = (firstValue + secondValue + thirdValue) / 3;
return statistic;
}
private static double computeMedian(double firstValue, double secondValue, double thirdValue) {
double statistic = Double.NaN;
if (((secondValue <= firstValue) && (firstValue <= thirdValue))
|| ((secondValue >= firstValue) && (firstValue >= thirdValue))) {
statistic = secondValue;
}
if (((firstValue <= secondValue) && (secondValue <= thirdValue))
|| ((firstValue >= secondValue) && (secondValue >= thirdValue))) {
statistic = secondValue;
}
if (((firstValue <= thirdValue) && (thirdValue <= secondValue))
|| ((firstValue >= thirdValue) && (thirdValue >= secondValue))) {
statistic = secondValue;
}
return statistic;
}
private static int computeMean(int firstValue, int secondValue, int thirdValue) {
int statistic = (firstValue + secondValue + thirdValue) / 3;
return statistic;
}
private static int computeMedian(int firstValue, int secondValue, int thirdValue) {
int statistic = Integer.MAX_VALUE;
if (((secondValue <= firstValue) && (firstValue <= thirdValue))
|| ((secondValue >= firstValue) && (firstValue >= thirdValue))) {
statistic = secondValue;
}
if (((firstValue <= secondValue) && (secondValue <= thirdValue))
|| ((firstValue >= secondValue) && (secondValue >= thirdValue))) {
statistic = secondValue;
}
if (((firstValue <= thirdValue) && (thirdValue <= secondValue))
|| ((firstValue >= thirdValue) && (thirdValue >= secondValue))) {
statistic = secondValue;
}
return statistic;
}
private static Number computeStatisticFromInput(StatisticsType type, Scanner scanner) {
Number firstInputValue = getValue("first", scanner);
Number secondInputValue = getValue("second", scanner);
Number thirdInputValue = getValue("third", scanner);
Number statisticValue = null;
if (firstInputValue instanceof Integer
&& secondInputValue instanceof Integer
&& thirdInputValue instanceof Integer) {
int firstValue = (int) firstInputValue;
int secondValue = (int) secondInputValue;
int thirdValue = (int) thirdInputValue;
if (type == StatisticsType.MEAN) {
statisticValue = computeMean(firstValue, secondValue, thirdValue);
} else if (type == StatisticsType.MEDIAN) {
statisticValue = computeMedian(firstValue, secondValue, thirdValue);
} else {
System.err.println("Cannot compute " + type + ".");
statisticValue = Integer.MAX_VALUE;
}
} else {
double firstValue = (double) firstInputValue;
double secondValue = (double) secondInputValue;
double thirdValue = (double) thirdInputValue;
if (type == StatisticsType.MEAN) {
statisticValue = computeMean(firstValue, secondValue, thirdValue);
} else if (type == StatisticsType.MEDIAN) {
statisticValue = computeMedian(firstValue, secondValue, thirdValue);
} else {
System.err.println("Cannot compute " + type + ".");
statisticValue = Double.NaN;
}
}
return statisticValue;
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
StatisticsType type = getStaticsticsType(scanner);
Number statistic = computeStatisticFromInput(type, scanner);
scanner.close();
System.out.println("The " + type.toString().toLowerCase() + " is " + statistic);
}
}
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