[java]这个程序如何修改通过，让它读取文件

import java.io.*;
import java.util.*;
public class test2
{
public static void main(String[] args)
{
Scanner input=null;
try
{
InputStream in=new FileInputStream(getClass().getResource("test.java").getFile());
input=new Scanner(in);
}
catch (FileNotFoundException e)
{}
while(input.hasNextLine())
{
System.out.println(input.nextLine());
}
}
}

test.java文件的路径是否正确

 InputStream in=getClass().getResourceAsStream("test.java");

public class Test {
public static void main(String[] args) {
Scanner input = null;

    File file = new File("D:\\wangzhidong\\workspace\\test\\src\\com\\test\\demo\\Test.java");
    try {
        InputStream in = new FileInputStream(file);
        input = new Scanner(in);
    } catch (FileNotFoundException e) {
    }
    while (input.hasNextLine()) {
        System.out.println(input.nextLine());
    }
}

}

最好是绝对路径
文件路径要给对