class Wordcount
{
	public static void main(String[] args)
	{

		String s="hello world";

		for(int i=0;i<s.length();i++)
		{
			String s1=""+i;

			int count=1;
			if(s.charAt(i)!=' ')
			{

				for(int j=i+1;j<s.length();j++)
				{
					if(s.charAt(i)==s.charAt(j))
					 {
					  count++;
					  s1=s1+"&"+j;
					 }
				}
				int before=0;
				for(int x=i-1;x>0;x--)
				{
					if(s.charAt(i)==s.charAt(x))
					before=1;
				}
				if(before==0)
				  System.out.println("the occurence of letter "+s.charAt(i)+" no of times= "+count+"--- positions="+s1);
		    }

		}
	
	}
}

Little change in the code

add this for loop
for (int x = i - 1; x >= 0; x--) 

instead of
for (int x = i - 1; x > 0; x--)

public class WordCount {
	public static void main(String args[])
	{
		String s = "HelloWorld";

		for(int i=0; i<s.length(); i++)  //Track 
each character
		{
			int flag = 0, count = 0;
			for(int j=i-1; j>=0; j--)
	//This loop is for: If character repeats or Space 
then skip to next character
			{
				if(s.charAt(j) == s.charAt
(i) || s.charAt(i) == ' ')
				{
					flag = 1;
					break;
				}
			}
			if(flag == 1)
				continue;
			
			System.out.print(s.charAt(i) 
+ ": ");    //Starts to check position and counter for 
repeated characters
			for(int k=i; k<s.length(); k++)
			{
				if(s.charAt(i) == s.charAt
(k))
				{
					count++;
					if(k == 
i)                  //Just for nice output
					
	System.out.print(k);
					else
					
	System.out.print("," + k);
				}
			}
			System.out.println(" & " + 
count);     //end output line with count
		}
	}
}