关于BufferedReader的read()和readLine()的区别

String str  = null;
br=new BufferedReader(new FileReader(fileName));
do{
str = buf.readLine()); 
}while(br.read()!=-1);

while(br.read() != -1){
str = br.readLine();
}

String str = null;
while((str = br.readLine()) != null){
//System.out.println(str);//此时str就保存了一行字符串
}

   FileReader fr = new FileReader("f:\\TestJava.Java");
   BufferedReader bf = new BufferedReader(fr);
   //这里进行读取
   int b;
   while((b=bf.read())!=-1){
    System.out.println(bf.readLine());
   }

String valueString = null;
   while ((valueString=bf.readLine())!=null){    
    System.out.println(valueString);
   }

while(br.readLine()!null) 
{ 
    msg=br.readLine(); 
}

BufferedReader br = new BufferedReader(new InputStreamReader(proc.getInputStream()));
    String msg = null;
while((msg = br.readLine())!= null)
 { 
System.out.println(msg); 
}