Must comment on the code at every "/* Comment Here */" section about what the code is doing.

public class Frame { public static final int FRAME_SIZE = 256; private byte[] frameValue;

public Frame() { frameValue = new byte[FRAME_SIZE]; }

public void setFrame(byte[] bytes) { /* Comment Here */ System.arraycopy(bytes, 0, frameValue, 0, FRAME_SIZE); }

public byte readWord(int offset) { return frameValue[offset]; } }

import java.io.*;

public class MakeBACKING_STORE { public static void main(String[] args) throws java.io.IOException { /* Comment Here */ File fileName; RandomAccessFile disk = null;

try { fileName = new File("BACKING_STORE"); disk = new RandomAccessFile(fileName, "rw"); for (int i = 0; i < 256*256/4; i++) { disk.writeInt(i); } } catch (IOException e) { System.err.println ("Unable to create the file BACKING_STORE"); System.exit(1); } finally { disk.close(); } }

public class PageTableEntry { private int frameNumber; private boolean valid;

public PageTableEntry() { /* Comment Here */ valid = false; frameNumber = -1; }

public boolean getValidBit() { return valid; }

public int getFrameNumber() { return frameNumber; }

public void setMapping(int frameNumber) { this.frameNumber = frameNumber;

valid = true; } }

}