Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.util.Collections;
import java.util.HashSet;

import java.util.Set;

public class Main {
    /**
     * Creates an unmodifiable set filled with the given values.
     * 
     * @param <T>
     *            the set's element type.
     * @param values
     *            the values.
     * @return a newly created set containing the given values.
     */
    @SafeVarargs
    public static <T> Set<T> createUnmodifiableSet(final T... values) {
        switch (values.length) {
        case 0:
            return Collections.emptySet();
        case 1:
            return Collections.singleton(values[0]);
        default:
            return Collections.unmodifiableSet(createHashSet(values));
        }
    }

    /**
     * Creates a <code>HashSet</code> filled with the given values.
     * 
     * @param <T>
     *            the set's element type.
     * @param values
     *            the values.
     * @return a newly created <code>HashSet</code> containing the given values.
     */
    @SafeVarargs
    public static <T> Set<T> createHashSet(final T... values) {
        final Set<T> set = new HashSet<T>(values.length);
        return addToSet(set, values);
    }

    /**
     * Adds several values to a set.
     * 
     * @param <T>
     *            the set's element type.
     * @param set
     *            the set.
     * @param values
     *            the values to be added.
     * @return the given set.
     */
    @SafeVarargs
    public static <T> Set<T> addToSet(final Set<T> set, final T... values) {
        for (final T t : values) {
            set.add(t);
        }
        return set;
    }
}