The point is to have a String read and to verify if it contains only letters. For example "qwerty123" would not be acceptable.
You could probably use Java 8 lambda expressions, they are fast and simple.
boolean allLetters = someString.chars().allMatch(Character::isLetter);
Check if a string is numeric
public class ...READ MORE
You can also use regular expression.
It will ...READ MORE
str != null && str.length() != 0
str ...READ MORE
The first and foremost way to check ...READ MORE
There doesn't seem to be a String.contains() ...READ MORE
You can use this method:
String strs = ...READ MORE
In Java 8 or earlier:
List<String> string = ...READ MORE
In Java 9 you can use:
List<String> list= List.of("Hello", "World", ...READ MORE
Java 8 Lambda Expression is used:
String someString ...READ MORE
The following code will perform your desired ...READ MORE
At least 1 upper-case and 1 lower-case letter
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