Question

怎么用JAVA编写记事本 用来显示行号

Answer 1

文件名换成你自己即可
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++;
}
}

}