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:
Flowchart :
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 :
Java Code Editor:
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Java: Tips of the Day
What is the best way to filter a Java Collection?
Java 8 (2014) solves this problem using streams and lambdas in one line of code:
List<Person> beerDrinkers = persons.stream() .filter(p -> p.getAge() > 16).collect(Collectors.toList());
Use Collection#removeIf to modify the collection in place. (Notice: In this case, the predicate will remove objects who satisfy the predicate):
persons.removeIf(p -> p.getAge() <= 16);
lambdaj allows filtering collections without writing loops or inner classes:
ListbeerDrinkers = select(persons, having(on(Person.class).getAge(), greaterThan(16)));
Ref: https://bit.ly/3uwYid6
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