JAVA Assignment 9: This assignment will focus on the use of classes, objects, ob

Question

JAVA Assignment 9: This assignment will focus on the use of classes, objects, object/instance variables, constructor methods, class methods, object/instance methods.

Follow the directions below to submit Assignment 9:

1. You will modify the AnyString class (INCLUDED BELOW). If your solution was not working use the solution file(s) provided.The AnyString class should be modified to add the following methods:

       a. Add a constructor method that will accept a character array argument. The character array argument should be used to set the object/instance variable.

       b. An object/instance method toString() that accepts no arguments and returns the object/instance variable.

       c. An object/instance method equals() that accepts an AnyString object and returns true if the argument contains a object/instance variable value that is equal to the object/instance     variable value of the object calling the method or false if not equal.

       d. An object/instance method isLetters() that accepts no arguments and returns true is the object/instance variable is all letters or false if not all letters.

       e. An object/instance method isNumeric() that accepts no arguments and returns true is the object/instance variable is all numbers or false if not all numbers.

2. Create a main() method for the AnyString class. **DO NOT USE the TestAnyStringClass to test your code**. The main() method should contain the following:

       a. You should input a string.

       b. Create an object of the AnyString class.

       c. Call all the methods in the AnyString class, verify that they work, and display the results.

       d. Create a character array and create an object of the AnyString class.

       e. Call all the methods in the AnyString class, verify that they work, and display the results.

---------------------------------------------------------------------------------------------------------------------------------

****Included below is the AnyString Class code to be modified****

import java.util.*;

class AnyString

{

String str;

AnyString(String s1)

{

str=s1;

}

String getString()

{

//returns the entered string value

return str;
}

String lowercase()

{

//returns entered string in lowercase

return str.toLowerCase();
}

String uppercase()

{

//returns entered string in uppercase

return str.toUpperCase();

}

int getLength()

{

//returns length of entered string

return str.length();

}

}

class TestAnyStringClass

{

public static void main(String args[])

{

String strD,st;

String lw,upr;

int length;

Scanner sc=new Scanner(System.in);

System.out.println("Enter a string ");

//accepting string value from user

strD=sc.next();

//initializing class AnyString and passing accepted value to constructor

AnyString a1=new AnyString(strD);

//calling getString() to get entered value

st=a1.getString();

System.out.println("Entered String is "+st);

//calling lowercase() to get entered value in lowercase

lw=a1.lowercase();

System.out.println("Conversion of String into Lowercase : "+lw);

//calling uppercase() to get entered value in uppercase

upr=a1.uppercase();

System.out.println("Conversion of String into Uppercase : "+upr);

//calling getLength() to get the length of entered value

length=a1.getLength();

System.out.println("Length of Entered string is "+length);

}

}

Explanation / Answer

Here is the modified version of AnyString.java. Sorry couldn't develop the tester class...

import java.util.*;
class AnyString
{
String str;

AnyString(String s1)
{
str=s1;
}
String getString()
{
//returns the entered string value
return str;
}
String lowercase()
{
//returns entered string in lowercase

return str.toLowerCase();
}
String uppercase()
{
//returns entered string in uppercase
return str.toUpperCase();
}
int getLength()
{
//returns length of entered string
return str.length();
}

//a. Add a constructor method that will accept a character array argument.
//The character array argument should be used to set the object/instance variable.
public AnyString(char temp[])
{
    str = "";
    for(int i = 0; temp[i] != ''; i++)
        str += temp[i];
    str += '';  
}

//b. An object/instance method toString() that accepts no arguments and returns the object/instance variable.
public String toString()
{
    return str;
}

// c. An object/instance method equals() that accepts an AnyString object and returns true
//if the argument contains a object/instance variable value that is equal to the
//object/instance variable value of the object calling the method or false if not equal.
public boolean equals(AnyString other)
{
    if(str.length() != other.str.length())
        return false;
    for(int i = 0; i < str.length(); i++)
        if(str.charAt(i) != other.str.charAt(i))
            return false;
    return true;          
}

// d. An object/instance method isLetters() that accepts no arguments and returns true is
//the object/instance variable is all letters or false if not all letters.
public boolean isLetters()
{
    for(int i = 0; i < str.length(); i++)
        if(!Character.isLetter(str.charAt(i)))
            return false;
    return true;      
}

//e. An object/instance method isNumeric() that accepts no arguments and returns true is
//the object/instance variable is all numbers or false if not all numbers.
public boolean isNumeric()
{
    for(int i = 0; i < str.length(); i++)
        if(!Character.isDigit(str.charAt(i)))
            return false;
    return true;      
}
}

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