1. Declare and implement a class named Compress . This class will have two strin
ID: 3546552 • Letter: 1
Question
1. Declare and implement a class named Compress. This class will have two string data members plainText andcompressedText and the following methods:
* a constructor initializing the strings with null strings.
* a method to take a text consisting of only lower-case alphabets and blank, and to put it into plainText,
* a method to take a text consisting of only lower-case alphabets and blank, and to put it into compressedText,
* a method to compress plainText to compressedText, using the compression techniques called
Explanation / Answer
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Compress {
String plainText;
String compressedText;
public Compress() {
plainText = "";
compressedText = "";
}
void compress(){
StringBuffer dest = new StringBuffer();
for (int i = 0; i < plainText.length(); i++) {
int runLength = 1;
while (i + 1 < plainText.length()
&& plainText.charAt(i) == plainText.charAt(i + 1)) {
runLength++;
i++;
}
dest.append(plainText.charAt(i));
dest.append(runLength);
}
compressedText = dest.toString();
}
void decompress(){
StringBuffer dest = new StringBuffer();
Pattern pattern = Pattern.compile("[0-9]+|[a-zA-Z]");
Matcher matcher = pattern.matcher(plainText);
while (matcher.find()) {
int number = Integer.parseInt(matcher.group());
matcher.find();
while (number-- != 0) {
dest.append(matcher.group());
}
}
compressedText = dest.toString();
}
String plainT(){
return plainText;
}
String compressT(){
return compressedText;
}
public static void main(String[] args) {
int i=0;
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
Compress str1 = new Compress();
while(true){
System.out.println("1.read plainText");
System.out.println("2.read compressedText");
System.out.println("3.compress");
System.out.println("4.decompress");
System.out.println("5.print plainText");
System.out.println("6.print compressedText");
System.out.println("7.quit");
System.out.print("Enter Your choice =");
try {
i = Integer.parseInt(in.readLine());
} catch (NumberFormatException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
switch (i) {
case 1:
System.out.print("Enter Your String =");
try {
str1.plainText = in.readLine();
} catch (IOException e) {
e.printStackTrace();
}
break;
case 2 :
System.out.print("Enter Your Compressed String =");
try {
str1.compressedText = in.readLine();
} catch (IOException e) {
e.printStackTrace();
}
break;
case 3:
str1.compress();
break;
case 4:
str1.decompress();
break;
case 5:
System.out.println("plainText ="+str1.plainT());
break;
case 6:
System.out.println("compressedText ="+str1.compressT());
break;
case 7:
System.exit(0);
break;
default:
break;
}
}
}
}
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