问在Linux下从其他工作路径运行java文件

EN

$ java -cp /var/project/run.jar com.test.FileMain
java.io.FileNotFoundException: file.txt (No such file or directory)
        at java.io.FileInputStream.open(Native Method)
        at java.io.FileInputStream.<init>(FileInputStream.java:120)
        at java.io.FileReader.<init>(FileReader.java:55)
        at com.test.FileMain.main(FileMain.java:20)

package com.test;

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.List;

public class FileMain {

    public static void main(String[] args) {

        List<Integer> list = new ArrayList<Integer>();
        File file = new File("file.txt");
        BufferedReader reader = null;

        try {
            reader = new BufferedReader(new FileReader(file));
            String text = null;

            while ((text = reader.readLine()) != null) {
                list.add(Integer.parseInt(text));
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (reader != null) {
                    reader.close();
                }
            } catch (IOException e) {
            }
        }

        // print out the list
        System.out.println(list);
    }

}