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Java program to check occurrence of each character in String
In order to find occurence of each character in a string we can use Map utility of Java.In Map a key could not be duplicate so make each character of string as key of Map and provide initial value corresponding to each key as 1 if this character does not inserted in map before.Now when a character repeats during insertion as key in Map increase its value by one.Continue this for each character untill all characters of string get inserted.
Example
public class occurenceOfCharacter {
public static void main(String[] args) {
String str = "SSDRRRTTYYTYTR";
HashMap <Character, Integer> hMap = new HashMap<>();
for (int i = str.length() - 1; i > = 0; i--) {
if (hMap.containsKey(str.charAt(i))) {
int count = hMap.get(str.charAt(i));
hMap.put(str.charAt(i), ++count);
} else {
hMap.put(str.charAt(i),1);
}
}
System.out.println(hMap);
}
}Output
{D=1, T=4, S=2, R=4, Y=3}
Updated on: 23-Jun-2020
17K+ Views
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