Example usage for java.lang Character isLetter

Introduction

In this page you can find the example usage for java.lang Character isLetter.

Prototype

public static boolean isLetter(int codePoint)

Source Link

Document

Determines if the specified character (Unicode code point) is a letter.

Usage

From source file:MainClass.java

public static void main(String[] args) {
    char symbol = 'A';

    if (Character.isLetter(symbol)) {
        System.out.println("true");
    } else {//from   w w  w  . ja  v  a 2s  .  c o m
        System.out.println("false");
    }
}

From source file:Main.java

public static void main(String[] args) {
    char ch1 = 'A', ch2 = '9';

    boolean b1 = Character.isLetter(ch1);
    boolean b2 = Character.isLetter(ch2);

    System.out.println(ch1 + " is a letter is " + b1);
    System.out.println(ch2 + " is a letter is " + b2);
}

From source file:Main.java

public static void main(String[] argv) throws Exception {

    char ch = 'a';
    if (Character.isLetter(ch)) { // true
    }/*  w  w  w .  jav  a2s  . co m*/
    if (Character.isDigit(ch)) { // false
    }
    if (Character.isLowerCase(ch)) { // true
    }
    if (Character.isUpperCase(ch)) { // false
    }
}

From source file:Main.java

public static void main(String[] args) {
    int cp1 = 0x0065, cp2 = 0x0066;

    boolean b1 = Character.isLetter(cp1);
    boolean b2 = Character.isLetter(cp2);
    System.out.println("Code point cp1 is a letter==" + b1);
    System.out.println("Code point cp2 is a letter==" + b2);
}

From source file:MainClass.java

public static void main(String args[]) {
    System.out.println(Character.isLetter('A'));
}

From source file:Main.java

public static void main(String[] args) {
    String str = "12345";
    int counter = 0;
    for (int i = 0; i < str.length(); i++) {
        if (Character.isLetter(str.charAt(i)))
            counter++;//  w w w .j  av a  2 s  . c o  m
    }
    System.out.println(counter + " letters.");
}

From source file:IsDemo.java

public static void main(String args[]) {
    char a[] = { 'a', 'b', '5', '?', 'A', ' ' };

    for (int i = 0; i < a.length; i++) {
        if (Character.isDigit(a[i]))
            System.out.println(a[i] + " is a digit.");
        if (Character.isLetter(a[i]))
            System.out.println(a[i] + " is a letter.");
        if (Character.isWhitespace(a[i]))
            System.out.println(a[i] + " is whitespace.");
        if (Character.isUpperCase(a[i]))
            System.out.println(a[i] + " is uppercase.");
        if (Character.isLowerCase(a[i]))
            System.out.println(a[i] + " is lowercase.");
    }//from  ww  w.  j a v a  2  s  .  c  o m
}

From source file:Main.java

public static void main(String[] args) {

    char a[] = { 'a', 'b', '5', '?', 'A', ' ' };

    for (int i = 0; i < a.length; i++) {

        if (Character.isDigit(a[i]))
            System.out.println(a[i] + "is a digit ");
        if (Character.isLetter(a[i]))
            System.out.println(a[i] + "is a letter ");
        if (Character.isWhitespace(a[i]))
            System.out.println(a[i] + "is a White Space ");
        if (Character.isLowerCase(a[i]))
            System.out.println(a[i] + "is a lower case ");
        if (Character.isLowerCase(a[i]))
            System.out.println(a[i] + "is a upper case ");
    }//from   w ww  .  j a  va  2 s .c o  m

}

From source file:StringCharacters.java

public static void main(String[] args) {
    String text = "To be or not to be?";

    int spaces = 0, vowels = 0, letters = 0;

    for (int i = 0; i < text.length(); i++) {
        char ch = Character.toLowerCase(text.charAt(i));
        if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u')
            ++vowels;/*  www. j a v  a2s  . c o  m*/
        if (Character.isLetter(ch))
            ++letters;
        if (Character.isWhitespace(ch))
            ++spaces;
    }
}

From source file:Main.java

public static void main(String[] args) throws java.io.IOException {
    char c = 'a';

    System.out.println("Character = " + (int) c);
    System.out.println("Defined = " + Character.isDefined(c));
    System.out.println("Digit = " + Character.isDigit(c));
    System.out.println("Ignorable = " + Character.isIdentifierIgnorable(c));
    System.out.println("ISO control = " + Character.isISOControl(c));
    System.out.println("Java identifier part = " + Character.isJavaIdentifierPart(c));
    System.out.println("Java identifier start = " + Character.isJavaIdentifierStart(c));
    System.out.println("Letter = " + Character.isLetter(c));
    System.out.println("Letter or digit = " + Character.isLetterOrDigit(c));
    System.out.println("Lowercase = " + Character.isLowerCase(c));
    System.out.println("Space = " + Character.isSpaceChar(c));
    System.out.println("Titlecase = " + Character.isTitleCase(c));
    System.out.println("Unicode identifier part = " + Character.isUnicodeIdentifierPart(c));
    System.out.println("Unicode identifier start = " + Character.isUnicodeIdentifierStart(c));
    System.out.println("Uppercase = " + Character.isUpperCase(c));
    System.out.println("White space = " + Character.isWhitespace(c));

    byte[] types = { Character.COMBINING_SPACING_MARK, Character.CONNECTOR_PUNCTUATION, Character.CONTROL,
            Character.CURRENCY_SYMBOL, Character.DASH_PUNCTUATION, Character.DECIMAL_DIGIT_NUMBER,
            Character.ENCLOSING_MARK, Character.END_PUNCTUATION, Character.FORMAT, Character.LETTER_NUMBER,
            Character.LINE_SEPARATOR, Character.LOWERCASE_LETTER, Character.MATH_SYMBOL,
            Character.MODIFIER_SYMBOL, Character.NON_SPACING_MARK, Character.OTHER_LETTER,
            Character.OTHER_NUMBER, Character.OTHER_PUNCTUATION, Character.OTHER_SYMBOL,
            Character.PARAGRAPH_SEPARATOR, Character.PRIVATE_USE, Character.SPACE_SEPARATOR,
            Character.START_PUNCTUATION, Character.SURROGATE, Character.TITLECASE_LETTER, Character.UNASSIGNED,
            Character.UPPERCASE_LETTER };

    String[] typeNames = { "Combining spacing mark", "Connector punctuation", "Control", "Currency symbol",
            "Dash punctuation", "Decimal digit number", "Enclosing mark", "End punctuation", "Format",
            "Letter number", "Line separator", "Lowercase letter", "Math symbol", "Modifier symbol",
            "Non spacing mark", "Other letter", "Other number", "Other punctuation", "Other symbol",
            "Paragraph separator", "Private use", "Space separator", "Start punctuation", "Surrogate",
            "Titlecase letter", "Unassigned", "Uppercase letter" };

    int type = Character.getType(c);

    for (int i = 0; i < types.length; i++)
        if (type == types[i]) {
            System.out.println("Type name = " + typeNames[i]);
            break;
        }//from   w  w w.j ava 2 s . c  o  m

    System.out.println("Unicode block = " + Character.UnicodeBlock.of(c));
}