Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Join the Stack Overflow community to: Ask programming questions Answer and help your peers Get recognized for your expertise up vote 19 down vote accepted Primitive data types cannot be null. Only Object data types can be null. int, long, etc. can't be null. If you use Long (wrapper class for long) then you can check for null's: Long long Value = null; if(long Value = null) If the long Value variable is of type Long (the wrapper class, not the primitive long then yes you can check for null values. A primitive variable needs to be initialized to some value explicitly (e.g. to 0) so its value will never be null. You can check Long object for null value with long Value = null, you can use long Value = 0 L for long (primitive because default value of long is 0 L, but it's result will be true if long Value is zero too If it is Long object then You can use long Value = null or you can use Java 8 specific Objects.is Null(long Value) method. Please check Objects for more info. Your Answer draft saved draft discarded lang-java.
java.lang. Object org.apache.commons.lang. Array Utils public class Array Utilsextends Object Operations on arrays, primitive arrays (like int[]) and primitive wrapper arrays (like Integer[]). This class tries to handle null input gracefully. An exception will not be thrown for a null array input. However, an Object array that contains a null element may throw an exception. Each method documents its behaviour. Thread Safe Since: 2.0 Version: $ Id: Array Utils.java Z niallp $ Author: Apache Software Foundation, Moritz Petersen, Fredrik Westermarck, Nikolay Metchev, Matthew Hawthorne, Tim O' Brien, Pete Gieser, Gary Gregory, Ashwin S, Maarten Coene EMPTY_ OBJECT_ ARRAY public static final Object[] EMPTY_ OBJECT_ ARRAY An empty immutable Object array. EMPTY_ CLASS_ ARRAY public static final Class[] EMPTY_ CLASS_ ARRAY An empty immutable Class array. EMPTY_ STRING_ ARRAY public static final String[] EMPTY_ STRING_ ARRAY An empty immutable String array. EMPTY_ LONG_ ARRAY public static final long[] EMPTY_ LONG_ ARRAY An empty immutable long array. EMPTY_ LONG_ OBJECT_ ARRAY public static final Long[] EMPTY_ LONG_ OBJECT_ ARRAY An empty immutable Long array. EMPTY_ INT_ ARRAY public static final int[] EMPTY_ INT_ ARRAY An empty immutable int array. EMPTY_ INTEGER_ OBJECT_ ARRAY public static final Integer[] EMPTY_ INTEGER_ OBJECT_ ARRAY An empty immutable Integer array. EMPTY_ SHORT_ ARRAY public static final short[] EMPTY_ SHORT_ ARRAY An empty immutable short array. EMPTY_ SHORT_ OBJECT_ ARRAY public static final Short[] EMPTY_ SHORT_ OBJECT_ ARRAY An empty immutable Short array. EMPTY_ BYTE_ ARRAY public static final byte[] EMPTY_ BYTE_ ARRAY An empty immutable byte array. EMPTY_ BYTE_ OBJECT_ ARRAY public static final Byte[] EMPTY_ BYTE_ OBJECT_ ARRAY An empty immutable Byte array. EMPTY_ DOUBLE_ ARRAY public static final double[] EMPTY_ DOUBLE_ ARRAY An empty immutable double array.
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