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Check if the String contains only unicode letters in Java
In order to check if a String has only Unicode letters in Java, we use the isDigit() and charAt() methods with decision-making statements.
The isLetter(int codePoint) method determines whether the specific character (Unicode codePoint) is a letter. It returns a boolean value, either true or false.
Declaration −The java.lang.Character.isLetter() method is declared as follows −
public static boolean isLetter(int codePoint)
Here, the parameter codePoint represents the character to be checked.
The charAt() method returns a character value at a given index. It belongs to the String class in Java. The index must be between 0 to length()-1.
Declaration −The java.lang.String.charAt() method is declared as follows −
public char charAt(int index)
Let us see a program in Java to check if a String has only Unicode Letters.
Example
public class Example {
boolean check(String s) {
if (s == null) // checks if the String is null {
return false;
}
int len = s.length();
for (int i = 0; i < len; i++) {
// checks whether the character is not a letter
// if it is not a letter ,it will return false
if ((Character.isLetter(s.charAt(i)) == false)) {
return false;
}
}
return true;
}
public static void main(String [] args) {
Example e = new Example();
String s = "@asd"; // returns false due to special character presence
String s1 = "134s"; // returns false due to presence of digits
String s2 = "abcd"; // returns true
String s3= "g c1"; // returns false due to space and digits
System.out.println("String "+s+" has only unicode letters : "+e.check(s));
System.out.println("String "+s1+" has only unicode letters : "+e.check(s1));
System.out.println("String "+s2+" has only unicode letters : "+e.check(s2));
System.out.println("String "+s3+" has only unicode letters : "+e.check(s3));
}
}Output
String @asd has only unicode letters : false String 134s has only unicode letters : false String abcd has only unicode letters : true String g c1 has only unicode letters : false
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