Reading from a file and writing it back to a file in java(Having trouble understanding BufferedWriter write method in java)

Question

I'm confused with the the java BufferedWriter write method. The java documents says that write takes int as an argument.

void write(int c) Writes a single character.

But I have used write method in my code, and I have passed String into it

BufferedReader br=new BufferedReader(file);
BufferedWriter bw=new BufferedWriter(file1);
String line=null;
while((line=br.readLine())!=null) 
{
  bw.write(line); // Why is this statement working?
  bw.write("\r\n");
}

I passing "line" to bw.write(line) and "line" is a string, why is this working?Is write 
method  overloaded?But I don't see it in docs.

Answer 1

因为存在一个接受字符串的write()和BufferedWriter “ IS-A” Writer子类，所以这就是它具有write(String)原因，因为Writer类具有它。

Answer 2

Api copy / paste : http://docs.oracle.com/javase/7/docs/api/java/io/BufferedWriter.html

Class BufferedWriter

java.lang.Object java.io.Writer <------ *has method write(String str) java.io.BufferedWriter

There is a write method which is capable to take a string as param and write it.

As Luis Alberto allready mentioned.