如何使用BufferedReader循环读文件

import java.io.*;
public class test {
    public static void main(String[] args)  {
	BufferedReader br = null;
        try {
            br = new BufferedReader(new FileReader("F:\\test.txt"));
            System.out.println(br.readLine());
        } catch (IOException e) {
            e.printStackTrace();
        }
}

import java.io.*;
public class test {
    public static void main(String[] args)  {
	BufferedReader br = null;
        try {
            br = new BufferedReader(new FileReader("F:\\test.txt"));
            String text = null;
            //读取内容为null则表示读到了文件末尾
        	while ((text = br.readLine()) != null) {
            System.out.println(text);
       		 }
        } catch (IOException e) {
            e.printStackTrace();
        }
}

import java.io.*;
public class test {
    public static void main(String[] args)  {
	BufferedReader br = null;
        try {
            br = new BufferedReader(new FileReader("F:\\test.txt"));
            String text = null;
            //
        	while (true) {
	            if (br.readLine() == null) {
	                break;
	            }
            System.out.println(br.readLine());
       		 }
        } catch (IOException e) {
            e.printStackTrace();
        }
}

while (true) {
    if (br.readLine() == null) {
        break;
    }
   System.out.println(br.readLine());
 }

BufferedReader.rean(buffer)

len=BufferedReader.rean(buffer)