| career | drupal | java | mac | mysql | perl | scala | uml | unix  

Groovy example source code file (

This example Groovy source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

invalid_java_identifiers, invalid_java_identifiers, set, string, string, stringbuffer, stringbuffer, util, utilities, utilities

The Groovy source code

 * Copyright 2003-2007 the original author or authors.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.


import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

 *  Various utility functions for use in the compiler.

public abstract class Utilities
    private static final Set<String> INVALID_JAVA_IDENTIFIERS = new HashSet(Arrays.asList((
            "abstract assert boolean break byte case catch char class const continue default do double else enum " +
            "extends final finally float for goto if implements import instanceof int interface long native new " +
            "package private protected public short static strictfp super switch synchronized this throw throws " +
            "transient try void volatile while true false null").split(" ")));

    *  Returns a string made up of repetitions of the specified string.

    public static String repeatString( String pattern, int repeats )
        StringBuffer buffer = new StringBuffer( pattern.length() * repeats );
        for( int i = 0; i < repeats; i++ )
            buffer.append( pattern );

        return new String( buffer );

    *  Returns the end-of-line marker.

    public static String eol()
        return eol;

     * Tells if the given string is a valid Java identifier.
    public static boolean isJavaIdentifier(String name) {
        if (name.length() == 0 || INVALID_JAVA_IDENTIFIERS.contains(name)) return false;
        char[] chars = name.toCharArray();
        if (!Character.isJavaIdentifierStart(chars[0])) return false;
        for (int i = 1; i < chars.length; i++ ) {
            if (!Character.isJavaIdentifierPart(chars[i])) return false;
        return true;
    private static String eol = System.getProperty( "line.separator", "\n" );


Other Groovy examples (source code examples)

Here is a short list of links related to this Groovy source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller


new blog posts


Copyright 1998-2021 Alvin Alexander,
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.