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Java
public class dublicate 
{ 
	public static void isDuplicate(Character arr)
	{   int len=0;
		while(arr!=null)
		len++;
		Set<character> set=new HashSet<character>(Arrays.asList(arr));
		int len2=set.size();
		if(len==len2)
			System.out.println("array doesn't have duplicates");
		else
			System.out.println("yes they have duplicates\n");
		
	}
	public static void main(String args[])
	{
Scanner s=new Scanner(System.in);
System.out.println("enter elements in an array to check it contains duplicate elements or not\n");
Character arr[]=new Character[100];
for(Character c:arr)
	arr[c]=s.next().charAt(0);
}
}


What I have tried:

Here I'm getting NullPointer exception.I'm not getting how to correct it.Can anyone please help me?
Posted
Updated 7-Jan-19 19:52pm
v2
Comments
Richard MacCutchan 26-Aug-18 4:45am    
You fail to tell us where the exception occurs. However the two lines:

for(Character c:arr)
arr[c]=s.next().charAt(0);

make no sense. You are trying to use an object reference as an index into an array.

1 solution

You could have used split method in java to take the input from the console.
Something like
Java
split(" ");
 
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