下面的函数是从 /sys下面读取某个文件的内容，请指出其中的错误 public static String readSysClassFile(String sys_path) { String prop = ""; BufferedReaderreader = null; try{ reader = new BufferedReader(new FileReader(sys_path)); prop = reader.readline(); if (prop != null && pro.length() > 0){ #Substring the prop prop = pro.Substring(0,15); } } } catch (IOException e){ e.printStackTrace(); }finally { if (reader != null){ try { reader.close(); }carch (IOException e){ e.printStackTrace(); } } } if (TextUtils.isEmpty(prop)){ prop= "NULL" } return prop; }

这段代码中有以下错误：

1. `BufferedReaderreader = null;` 应该为 `BufferedReader reader = null;`

2. `prop = reader.readline();` 应该为 `prop = reader.readLine();`

3. `if (prop != null && pro.length() > 0){` 应该为 `if (prop != null && prop.length() > 0){`

4. `#Substring the prop` 这一行应该是注释，应该改为 `// Substring the prop`

5. `}carch (IOException e){` 应该为 `}catch (IOException e){`

6. `if (TextUtils.isEmpty(prop)){` 前面没有导入 `TextUtils` 类，需要加上 `import android.text.TextUtils;`

修改后的代码如下：

import android.text.TextUtils;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public static String readSysClassFile(String sys_path) {
    String prop = "";
    BufferedReader reader = null;
    try {
        reader = new BufferedReader(new FileReader(sys_path));
        prop = reader.readLine();
        if (prop != null && prop.length() > 0) {
            // Substring the prop
            prop = prop.substring(0, 15);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (reader != null) {
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    if (TextUtils.isEmpty(prop)) {
        prop = "NULL";
    }
    return prop;
}