Question

java记事本程序中显示行号的程序块

记事本的程序已经出来，老师要求每行都有行号 求这部分代码

Answer 1

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.ArrayList;

public class ShowSourceCode {

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

RandomAccessFile file = new RandomAccessFile("Add.java", "r");
String tmp;

while((tmp = file.readLine()) != null){
System.out.println(tmp);
}

file.seek(0);

int lineNum = 1;
while((tmp = file.readLine()) != null){
System.out.println(lineNum + ": " + tmp);
lineNum++;
}
}

}

追问

加了这个代码还是没用