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Java programming Exercises: Find and replace a word in a given string

Java Regular Expression: Exercise-13 with Solution

Write a Java program to find the word Python in a given string, if the word Python present in the string return Java otherwise return C++. Ignore case sensitive.

Sample Solution-1:

Java Code:

import java.util.*;

public class test {
 
   public static void main(String[] args) {
	   
	    String text = "python";
		System.out.println("Original string: "+text);
		System.out.println("New string: "+validate(text));
		text = "JavaScript";
		System.out.println("\nOriginal string: "+text);
		System.out.println("New string: "+validate(text));
		text = "PYTHON";
		System.out.println("\nOriginal string: "+text);
		System.out.println("New string: "+validate(text));
        }

   public static String validate(String text) {
	   	String str = text.toLowerCase();
		if (str.contains("python")) {
			return "Java";
		} 
		return "C++";
   }
}

Sample Output:

Original string: python
New string: Java

Original string: JavaScript
New string: C++

Original string: PYTHON
New string: Java

Pictorial Presentation:

Java Regular Expression: Find and replace a word in a given string.
Java Regular Expression: Find and replace a word in a given string.

Flowchart :

Flowchart: Find and replace a word in a given string.

Sample Solution-2:

Java Code:

public class test {
 
   public static void main(String[] args) {
	   
	    String text = "python";
		System.out.println("Original string: "+text);
		System.out.println("New string: "+validate(text));
		text = "JavaScript";
		System.out.println("\nOriginal string: "+text);
		System.out.println("New string: "+validate(text));
		text = "PYTHON";
		System.out.println("\nOriginal string: "+text);
		System.out.println("New string: "+validate(text));
        }

   public static String validate(String text) {
	   return text.matches("(?i).*(?<=python).*") ? "Java" : "C++";
   }
}

Sample Output:

Original string: python
New string: Java

Original string: JavaScript
New string: C++

Original string: PYTHON
New string: Java

Flowchart :

Flowchart: Find and replace a word in a given string.

Java Code Editor:

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Java: Tips of the Day

Split Java String by New Line

String lines[] = string.split("\\r?\\n");

There's only really two newlines (UNIX and Windows) that you need to worry about.

Ref: https://bit.ly/3dHk7ip