Part0.java is a sample program that reads data one line at a time from some input source and writes data to an output destination. You should use this as a basis for code. 

for PART 1: Read the input one line at a time and write each line to the output if it is not a duplicate of some previous input line. Take special care so that a file with a lot of duplicate lines does not use more memory than what is required for the number of unique lines. for PART 2: Read each of the lines of the input and output them in sorted order. Duplicate lines should be printed only once. Take special care so that a file with a lot of duplicate lines does not use more memory than what is required for the number of unique lines.

PART 1:

package comp2402a1;

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

public class Part1 {

/**

* Your code goes here - see Part0 for an example

* @param r the reader to read from

* @param w the writer to write to

* @throws IOException

*/

public static void doIt(BufferedReader r, PrintWriter w) throws IOException {

// Your code goes here - see Part0 for an example

}

/**

* The driver. Open a BufferedReader and a PrintWriter, either from System.in

* and System.out or from filenames specified on the command line, then call doIt.

* @param args

*/

public static void main(String[] args) {

try {

BufferedReader r;

PrintWriter w;

if (args.length == 0) {

r = new BufferedReader(new InputStreamReader(System.in));

w = new PrintWriter(System.out);

} else if (args.length == 1) {

r = new BufferedReader(new FileReader(args[0]));

w = new PrintWriter(System.out);

} else {

r = new BufferedReader(new FileReader(args[0]));

w = new PrintWriter(new FileWriter(args[1]));

}

long start = System.nanoTime();

doIt(r, w);

w.flush();

long stop = System.nanoTime();

System.out.println("Execution time: " + 10e-9 * (stop-start));

} catch (IOException e) {

System.err.println(e);

System.exit(-1);

}

}

}

PART 2

package comp2402a1;

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

public class Part2 {

/**

* Your code goes here - see Part0 for an example

* @param r the reader to read from

* @param w the writer to write to

* @throws IOException

*/

public static void doIt(BufferedReader r, PrintWriter w) throws IOException {

// Your code goes here - see Part0 for an example

}

/**

* The driver. Open a BufferedReader and a PrintWriter, either from System.in

* and System.out or from filenames specified on the command line, then call doIt.

* @param args

*/

public static void main(String[] args) {

try {

BufferedReader r;

PrintWriter w;

if (args.length == 0) {

r = new BufferedReader(new InputStreamReader(System.in));

w = new PrintWriter(System.out);

} else if (args.length == 1) {

r = new BufferedReader(new FileReader(args[0]));

w = new PrintWriter(System.out);

} else {

r = new BufferedReader(new FileReader(args[0]));

w = new PrintWriter(new FileWriter(args[1]));

}

long start = System.nanoTime();

doIt(r, w);

w.flush();

long stop = System.nanoTime();

System.out.println("Execution time: " + 10e-9 * (stop-start));

} catch (IOException e) {

System.err.println(e);

System.exit(-1);

}

}

}

package comp2402a1;

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.util.HashSet;

import java.util.Iterator;

import java.util.Set;

PART 0

public class Part0 {

/**

* Read lines one at a time from r. After reading all lines, output

* all lines to w, outputting duplicate lines only once. Note: the order

* of the output is unspecified and may have nothing to do with the order

* that lines appear in r.

* @param r the reader to read from

* @param w the writer to write to

* @throws IOException

*/

public static void doIt(BufferedReader r, PrintWriter w) throws IOException {

Set s = new HashSet<>();

for (String line = r.readLine(); line != null; line = r.readLine()) {

s.add(line);

}

for (String text : s) {

w.println(text);

}

}

/**

* The driver. Open a BufferedReader and a PrintWriter, either from System.in

* and System.out or from filenames specified on the command line, then call doIt.

* @param args

*/

public static void main(String[] args) {

try {

BufferedReader r;

PrintWriter w;

if (args.length == 0) {

r = new BufferedReader(new InputStreamReader(System.in));

w = new PrintWriter(System.out);

} else if (args.length == 1) {

r = new BufferedReader(new FileReader(args[0]));

w = new PrintWriter(System.out);

} else {

r = new BufferedReader(new FileReader(args[0]));

w = new PrintWriter(new FileWriter(args[1]));

}

long start = System.nanoTime();

doIt(r, w);

w.flush();

long stop = System.nanoTime();

System.out.println("Execution time: " + 10e-9 * (stop-start));

} catch (IOException e) {

System.err.println(e);

System.exit(-1);

}

}

}