令牌上的语法误差，放错了位置的构造

Question

如何解决此错误--->令牌上的语法错误，放错了位置的构造（s）错误是在下面指示的线上。注意：此代码已在网络上复制，并试图使其作为学习工具起作用我正在使用Eclipse谢谢！

import java.io.File;
import java.io.FileOutputStream;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class EcellTest22 {
     //Blank workbook
    XSSFWorkbook workbook = new XSSFWorkbook();
    //Create a blank sheet
    XSSFSheet sheet = workbook.createSheet("Employee Data");
    //This data needs to be written (Object[])
    Map<String, Object[]> data = new TreeMap<String, Object[]>();
     //
    data.put("1", new Object[]{"ID","NAME", "LASTNAME"}); <--Syntax error on token(s), misplaced construct(s) 

    data.put("2", new Object[]{1, "Amit", "Shukla"});
    data.put("3", new Object[]{2, "Lokesh", "Gupta"});
    data.put("4", new Object[]{3, "John", "Adwards"});
    data.put("5", new Object[]{4, "Brian", "Schultz"});
    //Iterate over data and write to sheet
    Set<String> keyset = data.keySet();
    int rownum = 0;
    for (String key : keyset) 
    {
        //create a row of excelsheet
        Row row = sheet.createRow(rownum++);
        //get object array of prerticuler key
        Object[] objArr = data.get(key);
        int cellnum = 0;
        for (Object obj : objArr) 
        {
            Cell cell = row.createCell(cellnum++);
            if (obj instanceof String) 
            {
                cell.setCellValue((String) obj);
            }
            else if (obj instanceof Integer) 
            {
                cell.setCellValue((Integer) obj);
            }
        }
    }
    try 
    {
        //Write the workbook in file system
        FileOutputStream out = new FileOutputStream(new File("C:\Documents and Settings\admin\Desktop\imp data\howtodoinjava_demo.xlsx"));
        workbook.write(out);
        out.close();
        System.out.println("howtodoinjava_demo.xlsx written successfully on disk.");
    } 
    catch (Exception e)
    {
        e.printStackTrace();
    }
    }
}

Answer 1

您需要将所有语句在声明之后放置在代码块中，例如方法而不是类块。从逻辑上讲，将所有语句放在代码块中可能是有意义的

private void processFile() {
    data.put("1", new Object[]{"ID","NAME", "LASTNAME"}); // <--Syntax error  
     ...//snip
  } catch (Exception e) {
     e.printStackTrace();
  } 
}

Answer 2

解决问题。我在Eclipse中创建了一个新项目，将POI（JAR）添加到库中，语法错误不再显示。

Answer 3

将所有代码放在主要方法中：

public static void main(String[] args) {
        //All of your code goes here
}

语句（这不包括声明）必须在块内执行。看来您正在进行某些代码的测试，这并不意味着是代码中的实际对象，因此您必须将其放置在主方法中。

Answer 4

粘贴尝试在任何方法中捕获块。上面的问题仅在课内提问，这就是为什么您获得语法错误消息或深入了解尝试

的原因

public void yourMethod(){    
        try 
         {
           //Write the workbook in file system
           FileOutputStream out = new FileOutputStream(new File("C:\Documents and Settings\admin\Desktop\imp data\howtodoinjava_demo.xlsx"));
                    workbook.write(out);
                    out.close();
                    System.out.println("howtodoinjava_demo.xlsx written successfully on disk.");
                } 
                catch (Exception e)
                {
                    e.printStackTrace();
            }
        }