Question

我犯了以下错误:

nameCombine.java:18: error: cannot find symbol
sb.append(s);"
  ^

symbol:   method append(String)
location: variable sb of type StringBuilder
nameCombine.java:19: error: cannot find symbol
        sb.append("	");
          ^
symbol:   method append(String)
location: variable sb of type StringBuilder
StringBuilder.java:16: error: cannot find symbol
        sb.append(s);
          ^
symbol:   method append(String)
location: variable sb of type StringBuilder
StringBuilder.java:17: error: cannot find symbol
        sb.append("	");
          ^
symbol:   method append(String)
location: variable sb of type StringBuilder

在试图编纂以下代码之后:

import java.util.ArrayList;

public class nameCombine {
   public static void main(String[] args) {
      ArrayList<String> list = new ArrayList<String>();
      list.add("firstName");
      list.add("middleName");
      list.add("lastName");

      StringBuilder sb = new StringBuilder();

      for (String s : list) {
         sb.append(s);
         sb.append("	");
      }

      System.out.println(sb.toString());
   }
}

我很抱歉,如果这是一个重复的问题(我敢肯定这是),但快速搜索没有产生任何有用的结果,反正对我而言。

What im trying to do (if you can t already tell):
Combine an arrayList (firstName, middleName, lastName) into one new string. Any suggestions as to how I can do that in Java is appreciated.

Answer 1

你的问题里面的代码绝对没有问题

最有可能的解释是,您正在汇编的代码与问题所在的代码不相同。首先,代码中的行号与前两个错误信息不一致。

Answer 2

如果你使用日食, 尝试再创造另一个这个项目, 有时日蚀会乱搞...

我按原样执行的... 结果结果如下

firstName   middleName  lastName

Answer 3

使用 StringBuffer 而不是 StringBuilder 。即使我也有同样的错误, 但当我使用 StringBuffer 时已经解决了。

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