我是 Java 新手，所以很抱歉。我有两个数组：int[] grades = {64,55,45,67,65,88};String[] unitCode = {"APP:","BSAD:","CF","DAD:","N&CS:","POP:"};我需要将每一个都放在一起形成：[APP:64, BSAD:55, CF45, DAD:67, N&CS:65, POP:88]我已经成功地用这段代码实现了这一点： public String[] unitMarks(int[] grades, String[] unitCode) { double sum = 0; for (double i : grades) sum += i; double average = (sum/grades.length); for (int i = 0; i <grades.length; i++) { String combination = unitCode[i]+grades[i]; unitCode[i] = combination; } return unitCode; }但我还需要在最后显示平均成绩，所以应该说：[APP:64, BSAD:55, CF:45, DAD:67, N&CS:65, POP:88, Average:64.0]我已经编写了用于查找成绩数组平均值的代码。我只是在使用组合数组返回平均值时遇到问题（并且还在其之前显示“平均值：”）。我尝试过做类似的事情 -String includedAverage = unitCode+" Average:"+average;return includedAverage;但随后它开始说它无法从 String 转换为 String[]。如果我将方法返回类型更改为 String 它不起作用：System.out.println(Arrays.toString(myArrays.unitMarks(grades, unitCode)));任何帮助或指示都会很棒。谢谢。
3 回答
www说
TA贡献1775条经验 获得超8个赞
您可以添加一个比数组多一个空间的结果数组unitcode，并将值分配给它，而不是修改输入：
public String[] unitMarks(int[] grades, String[] unitCode) {
double sum = 0;
for (double i : grades) {
sum += i;
}
double average = (sum / grades.length);
String[] result = new String[grades.length +1];
for (int i = 0; i < grades.length; i++) {
String combination = unitCode[i] + grades[i];
result[i] = combination;
}
result[result.length-1]= "Average:"+average;
return result;
}
HUWWW
TA贡献1874条经验 获得超12个赞
有两种方法可以做到这一点。1. 使用ArrayList，当向其中添加元素时，它的大小会增加
public List<String> unitMarks(int[] grades, String[] unitCode)
{
List<String> unitCodeArrayList = new ArrayList<String>();
double sum = 0;
for (double i : grades)
sum += i;
double average = (sum/grades.length);
for (int i = 0; i <grades.length; i++)
{
String combination = unitCode[i]+grades[i];
unitCodeArrayList.add(combination);
}
unitCodeArrayList.add("Average:"+average);
return unitCodeArrayList;
}
使用原始数组，但以这种方式附加到它（因为我不确定它的大小是多少）
public String[] unitMarks(int[] grades, String[] unitCode)
{
double sum = 0;
for (double i : grades)
sum += i;
double average = (sum/grades.length);
for (int i = 0; i <grades.length; i++)
{
String combination = unitCode[i]+grades[i];
unitCode[i] = combination;
}
String[] resUnitCode = appendArray(unitCode, "Average:"+average);
return resUnitCode;
}
private String[] appendArray(String[] array, String x){
String[] result = new String[array.length + 1];
for(int i = 0; i < array.length; i++)
result[i] = array[i];
result[result.length - 1] = x;
return result;
}
喵喔喔
TA贡献1735条经验 获得超5个赞
如果只需要显示数值，可以使用 Stream 计算平均值并一次性显示：
private void displayGradesAndAverage(int[] grades, String[] unitCode) {
IntStream.range(0, grades.length)
.peek(i -> System.out.print(unitCode[i] + grades[i] + ", "))
.map(i -> grades[i])
.average()
.ifPresent(avg -> System.out.println("Average:" + avg));
}
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