[英]Variable cannot be resolved to a variable
您能帮我提供以下代码吗? 我用static
方法创建了一个类,该类应return
类型为ArrayList<ArrayList<String>>
变量。 但是我在run()
函数结尾的return
语句中遇到了错误。 它说不能将数据解析为变量 ...
package com.ita;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
public class ReadCSV {
public static ArrayList<ArrayList<String>> run() {
String csvFile = "RSS_usernames.csv";
BufferedReader br = null;
String line = "";
String cvsSplitBy = ",";
try {
ArrayList<String> RSSname = new ArrayList<String>();
ArrayList<String> username= new ArrayList<String>();
ArrayList<ArrayList<String>> data = new ArrayList<ArrayList<String>>();
int i=0;
br = new BufferedReader(new FileReader(csvFile));
while ((line = br.readLine()) != null) {
// use comma as separator
String[] country = line.split(cvsSplitBy);
System.out.println("Country [code= " + country[0]
+ " , name=" + country[1] + "]");
RSSname.add(new String(country[0]));
username.add(new String(country[1].trim()));
data.add(new ArrayList<String>());
data.get(i).add(country[0]);
data.get(i).add(country[1].trim());
i=i+1;
}
System.out.println(data.get(0).get(1));
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
System.out.println("Done");
return data;
}
}
data
在try块内声明,因此它不在范围内。 将其声明移动到try块之前。
ArrayList<ArrayList<String>> data = new ArrayList<ArrayList<String>>();
try {
ArrayList<String> RSSname = new ArrayList<String>();
ArrayList<String> username= new ArrayList<String>();
...
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
System.out.println("Done");
return data;
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