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Functional Java is an open source library that supports closures for the Java programming language
There is a newer version: 5.0
package fj.function;

import fj.F;
import fj.F2;

import static fj.Function.curry;

/**
 * First-class functions on Characters.
 */
public final class Characters {
  private Characters() {
    throw new UnsupportedOperationException();
  }
  public static final F toString = new F() {
    public String f(final Character c) {return Character.toString(c);}
  };
  public static final F isLowerCase = new F() {
    public Boolean f(final Character ch) {return Character.isLowerCase(ch);}
  };
  public static final F isUpperCase = new F() {
    public Boolean f(final Character ch) {return Character.isUpperCase(ch);}
  };
  public static final F isTitleCase = new F() {
    public Boolean f(final Character ch) {return Character.isTitleCase(ch);}
  };
  public static final F isDigit = new F() {
    public Boolean f(final Character ch) {return Character.isDigit(ch);}
  };
  public static final F isDefined = new F() {
    public Boolean f(final Character ch) {return Character.isDefined(ch);}
  };
  public static final F isLetter = new F() {
    public Boolean f(final Character ch) {return Character.isLetter(ch);}
  };
  public static final F isLetterOrDigit = new F() {
    public Boolean f(final Character ch) {return Character.isLetterOrDigit(ch);}
  };
  public static final F isJavaIdentifierStart = new F() {
    public Boolean f(final Character ch) {return Character.isJavaIdentifierStart(ch);}
  };
  public static final F isJavaIdentifierPart = new F() {
    public Boolean f(final Character ch) {return Character.isJavaIdentifierPart(ch);}
  };
  public static final F isUnicodeIdentifierStart = new F() {
    public Boolean f(final Character ch) {return Character.isUnicodeIdentifierStart(ch);}
  };
  public static final F isUnicodeIdentifierPart = new F() {
    public Boolean f(final Character ch) {return Character.isUnicodeIdentifierPart(ch);}
  };
  public static final F isIdentifierIgnorable = new F() {
    public Boolean f(final Character ch) {return Character.isIdentifierIgnorable(ch);}
  };
  public static final F toLowerCase = new F() {
    public Character f(final Character ch) {return Character.toLowerCase(ch);}
  };
  public static final F toUpperCase = new F() {
    public Character f(final Character ch) {return Character.toUpperCase(ch);}
  };
  public static final F toTitleCase = new F() {
    public Character f(final Character ch) {return Character.toTitleCase(ch);}
  };
  public static final F> digit = curry(new F2() {
    public Integer f(final Character ch, final Integer radix) {return Character.digit(ch, radix);}
  });
  public static final F getNumericValue = new F() {
    public Integer f(final Character ch) {return Character.getNumericValue(ch);}
  };
  public static final F isSpaceChar = new F() {
    public Boolean f(final Character ch) {return Character.isSpaceChar(ch);}
  };
  public static final F isWhitespace = new F() {
    public Boolean f(final Character ch) {return Character.isWhitespace(ch);}
  };
  public static final F isISOControl = new F() {
    public Boolean f(final Character ch) {return Character.isISOControl(ch);}
  };
  public static final F getType = new F() {
    public Integer f(final Character ch) {return Character.getType(ch);}
  };
  public static final F getDirectionality = new F() {
    public Byte f(final Character ch) {return Character.getDirectionality(ch);}
  };
  public static final F isMirrored = new F() {
    public Boolean f(final Character ch) {return Character.isMirrored(ch);}
  };
  public static final F reverseBytes = new F() {
    public Character f(final Character ch) {return Character.reverseBytes(ch);}
  };
  public static final F isNewLine = new F() {
    public Boolean f(final Character c) { return c == '\n'; }
  };  
}