Question

How can I write java program code that do reverse, replace, remove char from string without using reverse, replace, remove method.

Only string method that I can use are length, concat, charAt, substring, and equals (or equalsIgnoreCase).

Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
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// ReverseReplaceRemoveCharDemo.java

import java.util.Scanner;

public class ReverseReplaceRemoveCharDemo {

   public static void main(String[] args) {
       String str,revStr="",afterReplaced="",charRemoved="";
       /*
       * Creating an Scanner class object which is used to get the inputs
       * entered by the user
       */
       Scanner sc = new Scanner(System.in);

       //Getting the input entered by the user
System.out.print("Enter String :");
str=sc.nextLine();
  
for(int i=str.length()-1;i>=0;i--)
{
   revStr+=str.charAt(i);
}

System.out.println("After reverse '"+str+"' is :"+revStr);
  
System.out.print("Enter string you want to replace :");
String replaceStr=sc.nextLine();
  
System.out.print("Enter string you want to replace with:");
String replaceWith=sc.nextLine();
  
int indx=str.indexOf(replaceStr);
if(indx!=-1)
{
   afterReplaced=str.substring(0,indx);
   afterReplaced+=replaceWith;
   afterReplaced+=str.substring(indx+1+replaceStr.length()-1,str.length());
   System.out.println("After replacing '"+replaceWith+"' , the new String is :"+afterReplaced);
}
else
{
   System.out.println("'"+replaceStr+"' is not substring of '"+str+"'");
}
  
System.out.print("Enter char to remove from '"+str+"':");
char ch=sc.next(".").charAt(0);
for(int i=0;i<str.length();i++)
{
   if(str.charAt(i)!=ch)
   {
       charRemoved+=str.charAt(i);
   }
}
System.out.println("String after removal of '"+ch+"' :"+charRemoved);
   }

}
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Enter String :you are so beautiful.
After reverse 'you are so beautiful.' is :.lufituaeb os era uoy
Enter string you want to replace :beautiful
Enter string you want to replace with:ugly
After replacing 'ugly' , the new String is :you are so ugly.
Enter char to remove from 'you are so beautiful.':a
String after removal of 'a' :you re so beutiful.

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