System.out.print("Enter a character: ");
String userInput= keyb.next();
char i = userInput.charAt(0); //getting the character by itself
int counter=0;
for(int index= 0; index < theString.length(); index++)
{
char ch = userInput.charAt(index);
if (ch==i) //comparing the chosen character to each character in the string
counter++; //keeping track of how many times you find a match
我是编程的新手，我必须编写一个程序，该程序将计算用户在也是输入字符串中选择的字符出现的次数。这只是程序中有问题的部分，运行时出现的错误是：线程“ main”中的异常java.lang.StringIndexOutOfBoundsException：字符串索引超出范围：1.不确定我在做什么错！
System.out.print("Enter a character: ");
String userInput= keyb.next();
char i = userInput.charAt(0);//getting the character by itself
int counter=0;
for(int index= 0; index< theString.length(); index++)
{
char ch = **theString**.charAt(index);
if (ch==i)//comparing the chosen character to each character in the string
counter++;//keeping track of how many times you find a match
我的假设是，您要遍历theString，将其每个字母与原始char比较。从theString中删除**，我刚刚添加了它以引起您对更改的注意。我猜theString是在代码的其他地方定义的。
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