Java Exercises: Replace a string "python" with "java" and "java" with "python" in a given string

Java Basic: Exercise-230 with Solution

Write a Java program to replace a string "python" with "java" and "java" with "python" in a given string.


English letters (including single byte alphanumeric characters, blanks, symbols) are given on one line. The length of the input character string is 1000 or less.

Pictorial Presentation:

Java Basic Exercises: Replace a string 'python' with 'java' and 'java' with 'python' in a given string.

Sample Solution:

Java Code:

 import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Input the string:");
        String str1 = br.readLine();
        str1 = str1.replaceAll("java", "py_thon");
        str1 = str1.replaceAll("python", "java");
        str1 = str1.replaceAll("py_thon", "python");
        System.out.println("New string:");

Sample Output:

Input the string:
python is more popular than java
New string:
java is more popular than python


Flowchart: Replace a string 'python' with 'java' and 'java' with 'python' in a given string.

Java Code Editor:

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Previous:Write a Java program that reads n digits (given) chosen from 0 to 9 and prints the number of combinations where the sum of the digits equals to another given number (s). Do not use the same digits in a combination.
Next: Write a Java program to find the difference between the largest integer and the smallest integer which are created by 8 numbers from 0 to 9. The number that can be rearranged shall start with 0 as in 00135668.

What is the difficulty level of this exercise?

Java: Tips of the Day

Count the number of occurrences of a char in a String:

int count = StringUtils.countMatches("a.b.c.d", ".");

Ref: https://bit.ly/2OTy6sG