Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.util.Collection;
import java.util.regex.Pattern;

public class Main {
    private static final Pattern unmodifiableCollectionClassNamePattern = Pattern
            .compile("java.util.Collections\\$(" + "Unmodifiable" + "(Set|SortedSet|NavigableSet("
                    + "\\$EmptyNavigableSet)?|" + "List|RandomAccessList|Collection)|" + "Singleton" + "(Set|List)|"
                    + "Empty" + "(Set|List))");

    /**
     * Used to determine immutability of a collection to pass the test #6 :)
     * @param c - a collection
     * @return {@code true} if this collection is one of standard immutable collections
     */
    public static boolean isImmutable(Collection<?> c) {
        String className = c.getClass().getName();
        return unmodifiableCollectionClassNamePattern.matcher(className).matches();
    }
}