Java中如何统计字符串数组匹配数并生成考试评分结果？

我正在开发一个可评分的模拟考试程序，主模块获取用户输入的20道选择题答案（A、B、C、D），通过for循环填充answerKeyArray（答案键数组）和testAnswers（用户答案数组）。目前已通过equals语句逐个对比两个数组，判断每题对错并输出每题结果，但希望改为统计正确、错误答案的数量，计算得分并输出类似「您以90%的成绩通过考试，恭喜！」「正确答案数量：18，错误答案数量：2」的结果。

现有代码片段：

int arraySize;
arraySize = 20;

// Declare and assign the variables to create the parallel array
int count;

// Access the contents of both arrays
for (count = 0; count <= arraySize - 1; count++) {
    System.out.println();
    // Message to display the Answerkey and testAnswer
    System.out.println("The correct answer to question " + (count + 1) + " is: " + answerKeyArray[count]);
    System.out.println("Your answer to question " + (count + 1) + " is: " + testAnswers[count]);
    
    // Find the correct and incorrect answers
    if (answerKeyArray[count].equals(testAnswers[count])) {
        // Message to display the answer is correct
        System.out.println("Question " + (count + 1) + " is correct ");
    } else {
        // Message to display the answer is incorrect
        System.out.println("Question " + (count + 1) + " is incorrect ");
    }
}

修改实现方案 #

1. 添加统计变量：在循环外部声明两个计数器，分别记录正确、错误答案的数量
2. 更新循环逻辑：在对错判断的分支中，对应递增计数器
3. 计算得分并输出结果：循环结束后计算得分百分比，按需求格式打印最终统计信息

修改后的完整代码：

int arraySize = 20;
int count;
// 初始化统计计数器
int correctCount = 0;
int incorrectCount = 0;

// 遍历对比答案并统计
for (count = 0; count < arraySize; count++) {
    System.out.println();
    System.out.println("The correct answer to question " + (count + 1) + " is: " + answerKeyArray[count]);
    System.out.println("Your answer to question " + (count + 1) + " is: " + testAnswers[count]);
    
    if (answerKeyArray[count].equals(testAnswers[count])) {
        System.out.println("Question " + (count + 1) + " is correct ");
        correctCount++;
    } else {
        System.out.println("Question " + (count + 1) + " is incorrect ");
        incorrectCount++;
    }
}

// 计算得分百分比（强制转double避免整数除法精度丢失）
double scorePercentage = (double) correctCount / arraySize * 100;

// 打印最终结果
System.out.println("\n===== 考试结果 =====");
System.out.println("正确答案数量：" + correctCount + "，错误答案数量：" + incorrectCount);
if (scorePercentage >= 60) { // 可根据需求调整及格分数线
    System.out.printf("您以%.1f%%的成绩通过考试，恭喜！\n", scorePercentage);
} else {
    System.out.printf("您的成绩为%.1f%%，未通过考试，请继续努力！\n", scorePercentage);
}

细节说明 #

• 将count <= arraySize - 1简化为count < arraySize，符合Java数组遍历的常规写法
• 使用printf格式化输出百分比，保证显示更美观
• 及格分数线可根据实际需求修改阈值

内容的提问来源于stack exchange，提问作者TeeJ10