Question

我正在尝试让此程序在跳过字符串的第一行之后读取.csv文件并输出数据。

我尝试移动大括号或创建新的try-catch块。我试过将变量移到尝试之外。

import java.io.*;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;


public class USCrimesFile{
public static USCrimes[] read(String filename){

    //Declare Array
    USCrimes[] stats = new USCrimes[20];
    //Declare variables
    int count = 0;
    String inFile = "Crime.csv";
    String line;

    @SuppressWarnings({"rawtypes","unchecked"})

    try
    {
        ArrayList storeList = new ArrayList<USCrimes>();
        FileInputStream fstream = new FileInputStream(inFile);
        DataInputStream in = new DataInputStream(fstream);
        BufferedReader br = new BufferedReader(new InputStreamReader(in));
        String strLine;

        //Read file line by line
        strLine = br.readLine();
        while ((strLine = br.readLine()) !=null){
            storeList.add(read(strLine));
        }
        in.close();
    }           
    catch (IOException e){          
    }

    try{
        Scanner inputReader;
        inputReader = new Scanner(new File(filename));

        while(inputReader.hasNext()){
            line = inputReader.nextLine();
            String[] data = line.split(",");
            stats[count] = new USCrimes(Integer.parseInt(data[0]));
            stats[count].setPopulation(Double.parseDouble(data[1]));
            stats[count].setMurderRate(Double.parseDouble(data[5]));
            stats[count].setRobberyRate(Double.parseDouble(data[9]));
            count++;
        }
        inputReader.close();
    }
    catch (IOException e){
        System.out.println("File not found.");
    }
    return stats;
}}

期望它编译但输出错误：类型非法开始尝试

Answer 1

问题出在抑制警告注释上

@SuppressWarnings({"rawtypes","unchecked"})

这应该在方法级别或附加到变量storeList。

其他问题：

catch (IOException e){          
}

永远不要默默地吞下异常。如果这里出了问题，您将永远不会知道。

stats[count] = new USCrimes(Integer.parseInt(data[0]));

检查并确保不超过数组大小-尝试使用ArrayList

如何修正“非法的表情表达尝试{

1 个答案: