java.io.Console.readLine() does not read the characters left in the input stream buffer,after read
with BufferedReader( Console.reader() ).read(char[],int off,int len).

See the following version,code
<version>
C:\work>java -version
java version "1.6.0-auto"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-auto-284)
Java HotSpot(TM) Client VM (build 1.6.0-ea-b56, mixed mode)
</version>
<code>
import java.io.*;
class TestConsole3 {
public static void main(String[] args) {
try{
Console con =System.console();
String s1=null;
char ch[]=new char[20];
if (con != null) {
Reader reader = con.reader();
BufferedReader br = new BufferedReader(reader);
con.printf("Testing with BufferedReader.read() :%n");
con.printf("enter a line: ");
int n=br.read(ch,0,10);
con.printf("characters read with br.read(char[],int,int) : %s %n",new String(ch));
con.printf("Now Reading with console.readLine() : ");
s1=con.readLine();
con.printf("stream Read with console.readLine() is: %s ", s1 );

}
}catch(IOException e){
e.printStackTrace();
}
}
}
</code>
<Result>
D:\work\pp>java TestConsole3
Testing with BufferedReader.read() :
enter a line: Sun Rises In The East
characters read with br.read(char[],int,int) : Sun Rises
Now Reading with console.readLine() : hello java
stream Read with console.readLine() is: hello java
</Result>
   Here Console.readLine() discards the input stream 'In The East',opens new input stream.But the behavior is as expected when we replace BufferedReader with PushbackReader in the above program.
See the following code and result.

<code>
import java.io.*;
class TestConsole4 {
public static void main(String[] args) {
try{
Console con =System.console();
String s1=null;
char ch[]=new char[20];
if (con != null) {
Reader reader = con.reader();
PushbackReader pbr = new PushbackReader(reader);
con.printf("Testing with PushbackReader.read() :%n");
con.printf("enter a line: ");
int n=pbr.read(ch,0,10);
con.printf("characters read with pbr.read(char[],int,int) : %s %n",new String(ch));
con.printf("Now Reading with console.readLine() : %n");
s1=con.readLine();
con.printf("stream Read with console.readLine() is: %s ", s1 );

}
}catch(IOException e){
e.printStackTrace();
}
}
}
</code>
<Result>
D:\work\pp>java TestConsole4
Testing with PushbackReader.read() :
enter a line: Sun Rises In The East
characters read with pbr.read(char[],int,int) : Sun Rises
Now Reading with console.readLine() :
stream Read with console.readLine() is: In The East
</Result>
  
    There is conflict in behavior of Console.readLine(), reading the input stream buffer left after read with PushbackReader(Console.reader()).read() and BufferedReader(Console.reader).read().
This should be resolved.