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GeekInterview.com > Interview Questions > J2EE > Core Java
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Question: Jumble Array Values
Answer: An array A is of size N. Write a java method that jumbles all values in the array. All possible permutations must be possible and chances for each possible permutation must be equal. For example, size of array A is 3. A[0]=x, A[1]=y, A[2] =z.
Possible permutations are 3! After jumbling elements, there would be equal chances for each of xyz,yxz,... to be in the array elements.
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| October 10, 2008 15:01:40 |
#3 |
| c4crab |
Member Since: October 2008 Total Comments: 1 |
RE: Jumble Array Values
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import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Random;
public class Test {
public static void main(String[] args) {
HashMap hm = new HashMap();
int arr[] = new int[20];
for (int i = 0 ;i<20; i++)
{
arr[i]=i;
hm.put(String.valueOf(new Random().nextInt()),String.valueOf(i));
}
Collection arr1 = hm.values();
Iterator i = arr1.iterator();
while (i.hasNext())
{
System.out.println((String)i.next()+" ");
}
}
}
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