What are the evaluation criteria for Java functions?

Java functions are evaluated against the following criteria: Functionality: Performs tasks as expected. Performance: Efficient and low resource consumption. Testability: easy to test and verify. Readability: clear, easy to understand and easy to maintain. Versatility: reusable and adaptable to various scenarios. Security: Preventing errors or security breaches.

Java Function Evaluation Criteria

The quality of Java functions is crucial in software development. Here are some common evaluation criteria to help you evaluate the effectiveness of your function:

1. Functionality:

• Is it as per Expected to perform tasks?

  public int sum(int a, int b) {
    return a + b;
  }

2. Performance:

• Is it efficient and low in resource consumption?

  public int[] getEvenNumbers(int[] array) {
    int[] result = new int[array.length];
    int index = 0;
    for (int number : array) {
        if (number % 2 == 0) {
            result[index++] = number;
        }
    }
    return result;
  }

3. Testability:

• Is its behavior easy to test and verify?

  public boolean isPalindrome(String word) {
    int start = 0;
    int end = word.length() - 1;
    while (start <= end) {
        if (word.charAt(start) != word.charAt(end)) {
            return false;
        }
        start++;
        end--;
    }
    return true;
  }

4. Readability:

• ##Is it clear, easy to understand and easy to maintain?

  // 命名函数和变量以描述其目的
  public String reverseString(String input) {
    StringBuilder reversed = new StringBuilder();
    char[] chars = input.toCharArray();
    for (int i = chars.length - 1; i >= 0; i--) {
        reversed.append(chars[i]);
    }
    return reversed.toString();
  }

5. Versatility:

##Can it be reused and adapted to various scenarios?

• public <T> void swap(T[] array, int i, int j) {
    T temp = array[i];
    array[i] = array[j];
    array[j] = temp;
  }

6. Security:

Are bugs or security breaches prevented?

• // 使用异常处理来处理潜在错误
  public int divide(int a, int b) {
    if (b == 0) {
        throw new ArithmeticException("Division by zero");
    }
    return a / b;
  }

Take a practical case as an example:

Evaluation function

isPalindrome

:

• Functionality:
  Expected to correctly verify whether the word is a palindrome (positive and negative pronunciation are the same).
• Performance:
  Use a
  while
  • loop to compare between two pointers, The time complexity is O(n), where n is the length of the word.
• Testability:
  Can be easily tested with various test cases, such as
  "racecar"
  • , "hello" and "kayak".
• Readability:
  The function names and codes are concise and clear.
• Universality:
  Can handle any string input.
• Security:
  Does not work with empty strings.

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