What is the difference between empty and null

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Downloads Windows Visual Studio Null can be used for string , Integer ,date , or any fields in a database where as Empty is used for string fields. Leave a Reply Cancel reply. Loading Comments It is assigned with null. This is because the s1 does not refer to an actual string to count the length. Figure 2: Program with empty string.

Therefore, the JVM will allocate memory space for an empty string. When printing the length of the String s2, it will print 0. That is because s1 is pointing to a String, but it does not have any characters to count the length. Suppose, on the other hand, that you have a NotNull constraint on an element, meaning that input is required.

In this case, an empty string will pass this validation constraint. However, if you set the context parameter javax. Previous Page Next Page.