Question

Given are two strings, input string and a mask string that remove all the characters of the mask string from the original string.

Example:	INPUT:	ORIGINALSTRING:	communication
		MASK STRING:	mont
	OUTPUT:	cuicai

A class StringOp is defined as follows to perform above operation.

Some of the members of the class are given below:

Class name	StringOp
Data members/instance variables:
str	to store the original string
msk	to store the mask string
nstr	to store the resultant string
Methods / Member functions:
StringOp()	default constructor to initialize the data member with legal initial value
void accept( )	to accept the original string str and the mask string msk in lower case
void form()	to form the new string nstr after removal of characters present in mask from the original string
void display( )	to display the original string and the newly formed string nstr

Specify the class StringOp giving details of the constructor( ), void accept( ), void form() and void display( ). Define a main( ) function to create an object and call all the functions accordingly to enable the task.

Answer 1

import java.util.*;
class StringOp
{
  String str;
  String nstr;
  String msk;
  Scanner sc=new Scanner(System.in);
StringOp()
  {
    str="";
    nstr="";
    msk="";
  }
  void accept()//to accept the original and mask string
  {
    System.out.println("Enter the original word");
    str=sc.next()+sc.nextLine();
    System.out.println("enter the mask string");
    msk=sc.next();
  }
  void form() //formation of a new string according to the requirement
  {
    int l1=str.length();int l2=msk.length();
    for(int i=0;i<l1;i++)
    {
     int fr=0;char c1=str.charAt(i);
     if(msk.indexOf(c1)==-1)
       nstr=nstr+c1;
     }
  }
  void display() //display original and newly formed string
  {
    System.out.println("original string: "+str);
    System.out.println("changed string: "+nstr);
  }
  public static void main()
  {
    StringOp ob=new StringOp();
    ob.accept();
    ob.form();
    ob.display();
  }
}