java - Unresolved 编译问题: The method parseInt(String) is undefined for the type Integer

Question

为什么不喜欢parseInt？如何解决？

import java.lang.*;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.List;
import java.lang.*;

public class Table {

static class Data
{
    private String name = "";
    private int num = 0;

    public Data(String name, int num)
    {
        this.name = name;
        this.num = num;
    }

    public String getName()
    {
        return name;
    }

    public int getNum()
    {
        return num;
    }

    public String toString()
    {
        return name + " " + num;
    }
  }



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

    List<Data> table  = new ArrayList<Data>();

    try
    {
        String filename= ""C:\\input.txt";
        BufferedReader reader = new BufferedReader(new FileReader(filename));
        String line = reader.readLine();

        while(line != null)
        {
            String[] tokens = line.split("[ ]+");

            String tempname = tokens[0];
            int tempnum = Integer.parseInt(tokens[1]);

            Data temp = new Data(tempname,tempnum);

            table.add(temp);
            line = reader.readLine();
        }
        reader.close();
    }
    catch(FileNotFoundException n)
    {
        System.out.println("file not found");
    }
    catch(IOException a)
    {
        a.printStackTrace();
    }

    for(Data n:table)
    {
        System.out.println(n);
    }

       }

    }

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
The method parseInt(String) is undefined for the type Integer

at Table.main(Table.java:58)

Answer 1

代码中有两个问题:

删除导入的

import java.lang.*;

路径周围的引号不正确

我猜您对split()方法的正则表达式不正确。因此，假设您的输入文件具有以下格式:

name[]number

以下应该工作:

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

List<Data> table  = new ArrayList<Data>();

try {
    String filename= "/home/kiflem/input.txt";
    BufferedReader reader = new BufferedReader(new FileReader(filename));
    String line = reader.readLine();

    while(line != null) {
        String[] tokens = line.split("\\[\\s*\\]+");
        if (tokens != null && tokens.length == 2) {
            String tempname = tokens[0];
            int tempnum = Integer.parseInt(tokens[1]);
            Data temp = new Data(tempname,tempnum);
            table.add(temp);
         }
         line = reader.readLine();
     }
        .............

如果分隔符为空格，则使用

"\\s+"

作为您的正则表达式。