Write a program that gives count of common characters presented in an array of strings..(or array of_write a program charcount to compute counts of uni-优快云博客

本文介绍了一种算法，用于统计多个字符串中共同出现的字符数量。通过使用HashSet记录每个字符串中的唯一字符，并借助整型数组追踪这些字符在所有字符串中的出现次数，最终找出在所有输入字符串中都存在的字符。

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Write a program that gives count of common characters presented in an array of strings..(or array of character arrays)

For eg.. for the following input strings..

aghkafgklt
dfghako
qwemnaarkf

The output should be 3. because the characters a, f and k are present in all 3 strings.

Note: The input strings contains only lower case alphabets

<pre name="code" class="java">public int getNumOfCommonChars(String[] inputs) {
		// Return 0 if null / empty input or only one string is provided
		if(inputs == null || inputs.length < 2) {
			return 0;
		} else {
			//create an int array to hold # times character appears 
			int[] charCounts = new int[256];
			for(String input : inputs) {
				Set<Character> uniqueCharSet = new HashSet<Character>();
				for(int i=0; i < input.length(); i++) {
					char ch = input.charAt(i);
					if (!uniqueCharSet.contains(ch)) {
						uniqueCharSet.add(ch);
						charCounts[(int) ch] += 1;
					}
				}	
			}
		
			int commonCharCount = 0;
			for (int i=0; i < 256; i++) {
				if (charCounts[i] == inputs.length()) {
					commonCharCount++;
				}
			}
			
			return commonCharCount;
		}
	}