Here you can find the source of isEmpty(Collection> values)
public static boolean isEmpty(Collection<?> values)
//package com.java2s; /*/*from w w w . jav a 2 s. c o m*/ * Copyright 2011-2013 HTTL Team. * * 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 java.util.Collection; import java.util.Map; public class Main { public static boolean isEmpty(boolean[] values) { return values == null || values.length == 0; } public static boolean isEmpty(byte[] values) { return values == null || values.length == 0; } public static boolean isEmpty(char[] values) { return values == null || values.length == 0; } public static boolean isEmpty(short[] values) { return values == null || values.length == 0; } public static boolean isEmpty(int[] values) { return values == null || values.length == 0; } public static boolean isEmpty(long[] values) { return values == null || values.length == 0; } public static boolean isEmpty(float[] values) { return values == null || values.length == 0; } public static boolean isEmpty(double[] values) { return values == null || values.length == 0; } public static boolean isEmpty(Object[] values) { return values == null || values.length == 0; } public static boolean isEmpty(Collection<?> values) { return values == null || values.size() == 0; } public static boolean isEmpty(Map<?, ?> values) { return values == null || values.size() == 0; } }