Java programming Exercises: Check whether a string contains only a certain set of characters (a-z, A-Z and 0-9)
Java Regular Expression: Exercise-1 with Solution
Write a Java program to check whether a string contains only a certain set of characters (in this case a-z, A-Z and 0-9).
Sample Solution:
Java Code:
import java.util.Scanner;
public class test {
public static void main(String[] args) {
System.out.println(validate("ABCDEFabcdef123450"));
System.out.println(validate("SQL"));
System.out.println(validate("Java"));
System.out.println(validate("*&%@#!}{"));
System.out.println(validate("w3resource.com"));
}
public static boolean validate(String text) {
return text.matches("^[\\w]+$");
}
}
Sample Output:
true true true false false
Pictorial Presentation:
Flowchart :
Java Code Editor:
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Java: Tips of the Day
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Collections.sort(testList); Collections.reverse(testList);
That will do what you want. Remember to import Collections though!
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