运行Java时如何从文本文件中读取参数

Question

I have the below code

public class prob01 {
    public static void main (String arg[]) {
        System.out.println(arg[0]);
    }
}

I have a text file prob01.txt in the same directory which contains:
StackOverflow StackExchange

How can I get the output as StackOverflow from the above code when I give the arguments as prob01.txt like below: (I dont want to modify the java code, the dos has to take care of parsing the file and sending the contents as arguments)

C:\> javac prob01.java
C:\> java -cp . prob01 < prob01.txt

Answer 1

您需要在Java代码中使用Reader来读取文件的内容。