Question

How to count characters occurrences in a string with Java

Answer 1

public class MyClass {
    public static void main(String args[]) {
        
        String str = "java apache software";
        
        int[] count = new int[255];
 		int length = str.length();
 
		for (int i = 0; i < length; i++) {
			count[str.charAt(i)]++;
		}
 
		for (int i = 0; i < 255; i++) {
		    if (count[i] != 0) {
		        System.out.format("%c : %d\n", (char)i, count[i]);
			}
		}
    }
}

/*
run:

  : 2
a : 5
c : 1
e : 2
f : 1
h : 1
j : 1
o : 1
p : 1
r : 1
s : 1
t : 1
v : 1
w : 1

*/

 

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