Write a programme in java to accept a string and replace all CAT into DOG
16-06-2018    150 times
replace method java

Write a programme in java to accept a string and replace all "CAT" into "DOG".

This is a very easy programme. Just create a object of Scanner class and read a string. Now use the replace() method of the String class. This methods have two parameters. First parameter is the search word. i.e. this word is search from the given text and replace by the second parameter. Here CAT of the text is replace by the DOG. Now print the resultant String.

Tutorial at home
import java.util.*;
public class CatDog
{
    public static void main(String []args)
    {
        Scanner sc=new Scanner(System.in);
        System.out.print("Enter A String : ");
        String str=sc.nextLine();
        str=str.replace("CAT","DOG");
        System.out.print(str);
    }
}
Tutorial at home

Output
Enter A String : I HAVE A CAT. DO YOU WANT THAT CAT
I HAVE A DOG. DO YOU WANT THAT DOG

Another way of solution for the same program

import java.util.*;
public class Replace
{
    public static void main(String []args)
    {
        Scanner sc=new Scanner(System.in);
        System.out.print("Enter A String : ");
        String str=sc.nextLine();
        
        String words[]=str.split(" ");
        String res="";
        for(int i=0; i<words.length;i++)
        {
             if(words[i].equals("CAT"))
             {
                    res += "DOG ";
             }
             else
             {
                    res += words[i] + " ";
             }
        }
        System.out.print(res.trim());
    }
}
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    Author Details
Arnab De
I have over 16 years of experience working as an IT professional, ranging from teaching at my own institute to being a computer faculty at different leading institute across Kolkata. I also work as a web developer and designer, having worked for renowned companies and brand. Through tutorialathome, I wish to share my years of knowledge with the readers.
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