如何在JAVA程序显示时每行添加行号

大概就是这样啦，换成你自己的文件名就行了

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++

}

}

}

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++

}

}

}

---