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Check if the String contains only unicode letters and space 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)
where 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 to check whether a string contains Unicode Digits and Space in Java.
Example
public class Example {
boolean check(String s) {
int l=0; // counter for number of letters
int sp=0; // counter for number of spaces
if (s == null) // checks if the String is null {
return false;
}
int len = s.length();
for (int i = 0; i < len; i++) {
if ((Character.isLetter(s.charAt(i)) == true)) {
l++;
}
if(s.charAt(i) == ' ') {
sp++;
}
}
if(sp==0 || l==0 ) // even if one of them is zero then returns false
return false;
else
return true;
}
public static void main(String [] args) {
Example e = new Example();
String s = "sid";
String s1 = "y o y";
System.out.println("String "+s+" has only unicode letters and spaces :"+e.check(s));
System.out.println("String "+s1+" has only unicode letters and spaces: "+e.check(s1));
}
}
Output
String s id has only unicode letters and spaces: false String y o y has only unicode letters and spaces: true
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