Java错误，必需：char []找到char

Question

I have made a character array in Java,

char[] letterGrade = { 'A','B','C','D','F'};

and am trying to reference the elements like this,

letterGrade[0]

I am getting an error that says incompatible types

required: char[]

found: char

I've done this elsewhere in the code with an array of doubles and it worked fine. Why doesn't it work with a character array?

Thanks!

update from your comment

public static void method()
{
    double totalEarnedPoints = 1;
    double totalPossiblePoints = 1;

    double gradePer = 0.0;
    gradePer = (totalEarnedPoints / totalPossiblePoints);
    char[] letterGrade = { 'A', 'B', 'C', 'D','F'};
    if (gradePer >= gradeScale[0])
    {
        letterGrade = char letterGrade(0);
    }
    else if (calcPercent >= gradeCutoffs[1] && calcPercent < gradeCutoffs[0])
    {
        letterGrade= char letterGrade(1);
    }
}

Answer 1

"I'm trying to implement it with an if statement,

char[] letterGrade = { 'A', 'B', 'C', 'D','F'}; 
if (calcPercent >= gradeCutoffs[0]) { 
      letterGrade = letterGrade[0];
}

If you are doing so. Since letterGrade is of type char[] , you can't assign it with only char. LHS value must be a char.

Answer 2

The posted sample works if your target variable is of type char, so I assume that you are doing something wrong in the assignment. Maybe you are calling a function which requires a char[] in wich case you should use funct(letterGrade) without the [0] .

If your problem persists you should post a bit more code.

Update

I fixed your code to make it compile. of course I don't know what it is supposed to be so I had to make some assumptions, but you should see how the syntax is supposed to be.

public static void method()
{
    double totalEarnedPoints = 1;
    double totalPossiblePoints = 1;
    double gradeScale[] = {1, 2, 3};
    double gradeCutoffs[] = {1, 2, 3};
    double gradePer = 0.0;
    char letter;
    double calcPercent = 1;

    gradePer = (totalEarnedPoints / totalPossiblePoints);
    char[] letterGrade = { 'A', 'B', 'C', 'D','F'};
    if (gradePer >= gradeScale[0])
    {
        letter = letterGrade[0];
    }
    else if (calcPercent >= gradeCutoffs[1] && calcPercent < gradeCutoffs[0])
    {
        letter = letterGrade[1];
    }
    else
        letter = 'F';

    System.out.println("Grade:"+letter);
}

Answer 3

This works fine for me: char[] letterGrade = { 'A','B','C','D','F'}; System.out.println(letterGrade[0]); It outputs A

So I suspect it is what you are assigning it to. Perhaps somewhere you have: letterGrade = letterGrade[A]

Answer 4

required: char[]

found: char 

this type of error occurs , if you are assigning a char in char[] datatype.

ex:

char[] ch = letterGrade[0];