Java Collection Contain containsNull(Collection collection)

Description

contains Null

License

Apache License

Declaration

public static boolean containsNull(Collection<?> collection) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.util.Collection;

import java.util.Map;

public class Main {

    public static boolean containsNull(Collection<?> collection) {
        if (!isEmpty(collection)) {
            for (Object obj : collection) {
                if (obj == null) {
                    return true;
                }/*from  w ww.  ja va 2  s.c  om*/
            }
        }
        return false;
    }

    public static boolean isEmpty(Collection<?> collection) {
        return collection == null || collection.isEmpty();
    }

    public static boolean isEmpty(Map<?, ?> map) {
        return map == null || map.isEmpty();
    }
}

Related

1. containsKey(Collection keys, String key)
2. containsNo(Collection baseList, Collection valueList)
3. containsNone(Collection container, Collection other)
4. containsNoNull(final Collection c, final String s)
5. containsNoNulls(Collection container)
6. containsNull(Collection