Java - Calculate Mode
Here is the Java Source to calculate mode for a given set of numbers.
Source Code
import java.io.*;
import java.util.*;
import java.lang.*;
class CalcMode
{
public static void main(String[] args)
{
String inpstring = "";
InputStreamReader input = new InputStreamReader(System.in);
BufferedReader reader = new BufferedReader(input);
try
{
System.out.print("Enter a Number Elements to calculate Median:");
inpstring = reader.readLine();
long max = Long.parseLong(inpstring);
long[] arrElements = new long[100];
for (int i = 0; i < max; i++)
{
System.out.print("Enter [" + (i + 1) + "] Element: ");
inpstring = reader.readLine();
arrElements[i] = Long.parseLong(inpstring);
}
Map<Long, Integer> mymap = new HashMap<Long, Integer>();
for (int i = 0; i < max; i++)
{
if (mymap.containsKey(arrElements[i]) == false)
mymap.put(arrElements[i], 1);
else
{
int value = mymap.get(arrElements[i]);
mymap.put(arrElements[i], value + 1);
}
}
Set<Long> keyset = mymap.keySet();
Iterator it = keyset.iterator();
int maxcount = 0;
while(it.hasNext())
{
long key = Long.parseLong(it.next().toString());
int value = mymap.get(key);
System.out.println(key + " = " + value);
if (value > maxcount)
maxcount = value;
}
System.out.print("Mode: ");
it = keyset.iterator();
while (it.hasNext())
{
long key = Long.parseLong(it.next().toString());
int value = mymap.get(key);
if (value == maxcount)
System.out.print(key + " ");
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
Output
D:\Program Files\Java\jdk1.6.0_23\bin>java CalcMode
Enter a Number Elements to calculate Median:10
Enter [1] Element: 4
Enter [2] Element: 5
Enter [3] Element: 3
Enter [4] Element: 4
Enter [5] Element: 5
Enter [6] Element: 6
Enter [7] Element: 5
Enter [8] Element: 4
Enter [9] Element: 5
Enter [10] Element: 3
3 = 2
4 = 3
5 = 4
6 = 1
Mode: 5
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