help with convert in java for android [closed]

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I have this code in C#, I have tried to convert him to Java for android, but I get an error in doing so.

This is the C# code:

sum = "";
string Num = "123ABC";
int i, j;
string TmpOT;
for (i = 0; i < Num.Length; i++)
{
    TmpOT = Num.Substring(i, 1);
    j = Convert.ToChar(TmpOT);
    j = (j / 10) + (j % 10);
    if (j >= 10)
    {
        j = (j / 10) + (j % 10);
    }
    sum += j.ToString();
}

And this my attempt at converting it to Java:

for (i = 0; i < Num.length(); i++)
{
    TmpOT = Num.substring(i, 1);
    j = Convert.ToChar(TmpOT);
    j = (j / 10) + (j % 10);
    if (j >= 10)
    {
        j = (j / 10) + (j % 10);-
    }
    Sum += String.valueOf(j);
}

the error is in line 5 - convert to char

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There is no such thing as Convert.ToChar(...) in Java. You need to find the correct method.

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The first method in the java method listing for the String class: http://download.oracle.com/javase/1.4.2/docs/api/java/lang/String.html#charAt(int)

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Instead of the Java Convert.ToChar(TmpOT) try (int)TmpOT as Convert.ToChar(...) does not exist in Java.