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String str="abcdaefgh";
Map<String,Integer> map=new HashMap<String,Integer>();
for(char ch:str.getChars())
{
String ss=String.valueOf(ch);
Integer count=map.get(ss);
if(count==null)
count=1;
map.put(ss,count);
}
for(String st:map.keys())
{
System.out.println(st+":"+map.get(st));
}