Tests whether Collection contains no elements, true if c is null or c is empty. - Android java.util

Android examples for java.util:Collection Empty

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Description

Tests whether Collection contains no elements, true if c is null or c is empty.

Demo Code

/*// w  w w  . ja  v a  2s  . com
 * Copyright (C) 2012 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.
 */
import com.android.inputmethod.annotations.UsedForTesting;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Map;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class Main{
    /**
     * Tests whether c contains no elements, true if c is null or c is empty.
     * @param c Collection to test.
     * @return Whether c contains no elements.
     */
    @UsedForTesting
    public static boolean isNullOrEmpty(@Nullable final Collection c) {
        return c == null || c.isEmpty();
    }
    /**
     * Tests whether map contains no elements, true if map is null or map is empty.
     * @param map Map to test.
     * @return Whether map contains no elements.
     */
    @UsedForTesting
    public static boolean isNullOrEmpty(@Nullable final Map map) {
        return map == null || map.isEmpty();
    }
}

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