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Android example source code file (Lists.java)

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

Java - Android tags/keywords

arraylist, e, lists, util

The Lists.java Android example source code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * 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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.android.collect;

import java.util.ArrayList;
import java.util.Collections;

/**
 * Provides static methods for creating {@code List} instances easily, and other
 * utility methods for working with lists. 
 */
public class Lists {

    /**
     * Creates an empty {@code ArrayList} instance.
     *
     * <p>Note: if you only need an immutable empty List, use
     * {@link Collections#emptyList} instead.
     *
     * @return a newly-created, initially-empty {@code ArrayList}
     */
    public static <E> ArrayList newArrayList() {
        return new ArrayList<E>();
    }

    /**
     * Creates a resizable {@code ArrayList} instance containing the given
     * elements.
     *
     * <p>Note: due to a bug in javac 1.5.0_06, we cannot support the
     * following:
     *
     * <p>{@code List list = Lists.newArrayList(sub1, sub2);}
     *
     * <p>where {@code sub1} and {@code sub2} are references to subtypes of
     * {@code Base}, not of {@code Base} itself. To get around this, you must
     * use:
     *
     * <p>{@code List list = Lists.newArrayList(sub1, sub2);}
     *
     * @param elements the elements that the list should contain, in order
     * @return a newly-created {@code ArrayList} containing those elements
     */
    public static <E> ArrayList newArrayList(E... elements) {
        int capacity = (elements.length * 110) / 100 + 5;
        ArrayList<E> list = new ArrayList(capacity);
        Collections.addAll(list, elements);
        return list;
    }
}

Other Android examples (source code examples)

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