Question

我创建了一个字符串数组String[] arr来保存我文件中的所有内容：

String[] contentarr=file.openfile();

稍后当我尝试将此字符串数组转换回字符串时使用：

String contentstr=Arrays.toString(contentarr);

它一直给我错误arr无法解析为变量。任何线索为什么会这样？

更新的代码（学习Java周1.尝试在线学习一些教程但不确定如何解决此错误）：

package readText;

import java.io.IOException;
import java.util.Arrays;

public class FileData {

    public static void main(String[] args) throws Exception {

        String file_path1 = "F:\\CampusImages.txt";
        String file_path2 = "F:\\CampusImageIDs.txt";

        try{
            ReadFileLocal file = new ReadFileLocal(file_path1);
            String[] aryLines = file.openFile(); //Already wrote openFile function in another file.

            int i;
            for (i=0; i<aryLines.length; i++){
                System.out.println(aryLines[i]);
            }       
        }

        catch(IOException e) { 
            System.out.println(e.getMessage()); 
        }


        String all=Arrays.toString(aryLines);  //ERROR: aryLines cannot be resolved as a variable.
        WriteFile content = new WriteFile( file_path2, true);
        content.WriteToFile("Write from here: ");
        System.out.println(content);  // Also, is the writing part code right?
        }
}

Answer 1

Arylines不在范围内。

    String file_path1 = "F:\\CampusImages.txt";
    String file_path2 = "F:\\CampusImageIDs.txt";
    String[] arylines;           

    try{
        ReadFileLocal file = new ReadFileLocal(file_path1);
        aryLines = file.openFile(); 

        int i;
        for (i=0; i<aryLines.length; i++){
            System.out.println(aryLines[i]);
        }       
    }

    catch(IOException e) { 
        System.out.println(e.getMessage()); 
    }


    String all=Arrays.toString(aryLines);  //now arylines is resolved
    WriteFile content = new WriteFile( file_path2, true);
    content.WriteToFile("Write from here: ");
    System.out.println(content);  // Also, is the writing part code righ

无法将字符串数组转换为字符串

1 个答案: