(Solved Homework): Purpose: Use math functions, string manipulation and input/output to create an alternative to Twitter called Chipper.

-All of the functionalities are added to one class name Chipper only, the other class is simply the Main class that is creating an object and just calling in all the required functionalities of the Chipper class.

Chipper Class

import java.util.Random;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Chipper {

private String chat;

private String[] mgs; //Creating an array of String type to store all the msgs

Chipper(){
chat=null;
mgs=new String[3];
input();

}

public void input(){
Scanner scan=new Scanner(System.in); //To take in the input
Random ran=new Random(); //Using Random for creating a Random input size
for(int i=0;i<3;i++){
int length=ran.nextInt(51)+1; //Definining the max size of Randomness
System.out.println(“Message #”+(i+1)+”: Enter a message with “+length+” chars or less:”);
chat=scan.nextLine(); //taking the entire line as string input.

if(chat.length()>length){ //Checking the size of input
chat=chat.substring(0, length);
System.out.println(“Oops! Your message has more than “+length+” characters! It has been truncated to:”);
System.out.println(chat);
mgs[i]=chat;
}
else{
System.out.println(chat);
mgs[i]=chat;
}

}

}

public int countSpaces(){ //Counting the spaces in all of the 3 messages.
int count=0;

for(String str:mgs){

for(int i=0;i<str.length();i++){
if(Character.isWhitespace(str.charAt(i))){

count++;
}
}

}
return count;
}

public int countVowels(){ //Counting vowels in all of the messages
int count=0;
String regex=”[aeiou]”;//Defining the regular expression with one having [aeiou] characters
Pattern pat=Pattern.compile(regex); //using the pattern class to use the above pattern

for(String str:mgs){
Matcher mat=pat.matcher(str);

while(mat.find()){ //Counting the number of time vowels was encountered in the msg

count++;
}

}
return count;
}

public int countCharacter(){ //Counting Character in all of the msgs
int count=0;

for(String str:mgs){

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

count++;

}

/*This calls in the spaces in the end to remove space count from the final
* character count */

}
return (count-this.countSpaces());
}

public void diplay(){
for(String str:mgs){
System.out.println(str);
}
}

public void toLowerCase(){
for(String str:mgs){
for(int i=0;i<str.length();i++){
System.out.print(Character.toLowerCase(str.charAt(i)));
}
System.out.println();
}
}

public void count(){
System.out.println(“The count of characters in all of your messages: “+this.countCharacter());
System.out.println(“The number of vowels in all of your messages: “+this.countVowels());
System.out.println(“The number of spaces in all of your messages: “+this.countSpaces());
}

public void displayBackwards(){
for(String str:mgs){
for(int i=str.length()-1;i>=0;i–){
System.out.print(str.charAt(i));
}
System.out.println();
}
}
public String combinedMsg(){
StringBuilder strx=new StringBuilder();
for(String str:mgs){
strx.append(str);
strx.append(” “);
}
return strx.toString();
}

public void verticalMsg(){
String stx=this.combinedMsg();

for(int i=0;i<stx.length();i++){
System.out.println(stx.charAt(i));
}

}
}

Main Class

public class ChipperMain {

public static void main(String[] args){
Chipper cp=new Chipper();

System.out.println(“————-Result————–“);
cp.toLowerCase();
cp.count();
cp.displayBackwards();
System.out.println(“Combined Msgs:”+cp.combinedMsg());
cp.verticalMsg();
}

}

The output generated in the dry run.