import java.nio.CharBuffer;

public class CharBufferFlip{

public static void main(String[] args){

String[] poem = {"Roses are red, ",

"violets are blue. ",

"Sugar is sweet, ",

"and so are you. "};

CharBuffer buffer = CharBuffer.allocate(50);

for(int i=0; i<poem.length; i++){

// Fill the buffer.

for(int j=0; j<poem[i].length(); j++){

buffer.put(poem[i].charAt(j));

}

// Flip the buffer before reading the contents.

// flip() method just a convenient way to accomplish the task, you can invoke limit() and position() or discardMark() manually.

buffer.flip(); // set limit to be the current position, then set position to be 0, discarded any defined mark.

// Drain the buffer.

while(buffer.hasRemaining()){ // evaluate "position < limit"

System.out.print(buffer.get());

}

// Terminate the current line.

System.out.println();

// set position to be 0, limit to be capacity, discard any defined mark.

// Prepare buffer for asequence channel reading or invoking put() method. Otherwise, BufferOverflowException will be thrown.

buffer.clear();

}

}

}