java Java中的“<标识符>预期”编译错误
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原文地址: http://stackoverflow.com/questions/5527952/
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"<identifier> expected" compilation error in Java
提问by MassStrike
I get "<identifier> expected" error on this line....
我<identifier> expected在这条线上收到“ ”错误....
private static String getReducedISBN(char 'x') {
...of this code....
...这个代码....
public class CheckISBN7 {
//private static String originalISBN; // class variable
public static void main(String[] args) {
// Prompt the user to enter an ISBN
SimpleIO.prompt("Enter ISBN: ");
String originalISBN = SimpleIO.readLine();
// Get the ISBN number without the dashes
String reducedISBN = getReducedISBN('-');
// Get the computed check digit
int computedCheckDigit = getCheckDigit(reducedISBN);
// Display check digit entered by the user
System.out.println("Check digit entered: " + originalISBN.charAt(12));
// Display computed check digit
System.out.println("Check digit computed: " + computedCheckDigit);
}
private static String getReducedISBN(char 'x') {
SimpleIO.prompt("Enter ISBN: ");
String originalISBN = SimpleIO.readLine();
int dashPos1 = originalISBN.indexOf("x");
int dashPos2 = originalISBN.indexOf("x", dashPos1 + 1);
String reducedISBN = originalISBN.substring(0, dashPos1) +
originalISBN.substring(dashPos1 + 1, dashPos2) +
originalISBN.substring(dashPos2 + 1, 11);
return reducedISBN;
}
private static int getCheckDigit(String reducedISBNParameter) {
int total = 0;
final String digits = "0123456789X";
for(int i = 0, j = 10; i <= 8; i++, j++) {
total += j *
(Integer.parseInt(reducedISBNParameter.substring(i, i + 1)));
}
int checkDigit = 10 - ((total - 1) % 11);
int computedCheckDigit = digits.charAt(checkDigit);
return computedCheckDigit;
}
}
Can't really figure out the problem , any help would be much appreciated.
无法真正弄清楚问题，任何帮助将不胜感激。
回答by BoltClock
You're trying to pass the char value 'x'in your method signature, which isn't valid syntax:
您正在尝试'x'在方法签名中传递 char 值，这是无效的语法：
private static String getReducedISBN(char 'x') {
Did you mean to use xas a variable name?
您的意思是x用作变量名吗？
private static String getReducedISBN(char x) {
As well as here, since I assume you're trying to find the index of whatever you pass as the separator character instead of the string "x":
以及这里，因为我假设您正在尝试查找作为分隔符而不是字符串传递的任何内容的索引"x"：
int dashPos1 = originalISBN.indexOf(x);
int dashPos2 = originalISBN.indexOf(x, dashPos1 + 1);
回答by user268396
'x'is not an indentifier (variable or whatever), it is a literal character. Likewise "x" is a literal string. Replace char 'x'with Character xand "x"with x.toString()to get what you want.
'x'不是标识符（变量或其他），它是一个文字字符。同样，“x”是一个文字字符串。替换char 'x'withCharacter x和"x"withx.toString()以获得你想要的。
