Java programming Exercises: Move all lower case letters to the front, keeping the order of all the letters of a given word
Java Regular Expression: Exercise-23 with Solution
Write a Java program to move all lower case letters to the front of a given word keeping the relative position all the letters(both upper and lower case) same.
Sample Solution-1:
Java Code:
public class test {
public static void main(String[] args) {
String text ="Java";
System.out.println("Original String: "+text);
System.out.println("Move all lower case letters to the front of the said word: "+validate(text));
text ="JavaScript";
System.out.println("\nOriginal String: "+text);
System.out.println("Move all lower case letters to the front of the said word: "+validate(text));
text ="SQLite";
System.out.println("\nOriginal String: "+text);
System.out.println("Move all lower case letters to the front of the said word: "+validate(text));
}
public static String validate(String text) {
return text.replaceAll("[A-Z]", "") + text.replaceAll("[a-z]", "");
}
}
Sample Output:
Original String: Java Move all lower case letters to the front of the said word: avaJ Original String: JavaScript Move all lower case letters to the front of the said word: avacriptJS Original String: SQLite Move all lower case letters to the front of the said word: iteSQL
Pictorial Presentation:
Flowchart :
Sample Solution-2:
Java Code:
public class test {
public static void main(String[] args) {
String text ="Java";
System.out.println("Original String: "+text);
System.out.println("Move all lower case letters to the front of the said word: "+validate(text));
text ="JavaScript";
System.out.println("\nOriginal String: "+text);
System.out.println("Move all lower case letters to the front of the said word: "+validate(text));
text ="SQLite";
System.out.println("\nOriginal String: "+text);
System.out.println("Move all lower case letters to the front of the said word: "+validate(text));
}
public static String validate(String text) {
String upper_ch = "",lower_ch = "";
for(char ch : text.toCharArray())
if(Character.isLowerCase(ch))
lower_ch+=ch;
else
upper_ch+= ch;
return lower_ch + upper_ch;
}
}
Sample Output:
Original String: Java Move all lower case letters to the front of the said word: avaJ Original String: JavaScript Move all lower case letters to the front of the said word: avacriptJS Original String: SQLite Move all lower case letters to the front of the said word: iteSQL
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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