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Null denotes variables that are not object-oriented and contain no value. You can use a basic ‘if’ statement to check for a null value in a piece of code. Null is often used to indicate or determine the non-existence of some value. With such a context, null can be used as a condition to start or end other processes in the code. [1] X Research Source
Steps
Checking for null on Java
- The value of “0” and null is not the same, so the use is also different.
-
variableName = null;
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variableName == null; - You can also use the “!=” operator to check if a certain value is NOT equal.
- For example, if the value is null, you enter “object is null”. If the two signs “==” do not find the variable to be null, the operator will ignore the condition or find another path.
Object object = null ; if ( object == null ) { System . out . print ( "object is null " ); }
Use the null check statement
- With
string()null will be a temporary value until the value is actually used.
- For example, execute something while the object is null, or do nothing until the object is NO longer null.
synchronized method () { while ( method ()== null ); method (). nowCanDoStuff (); }
Advice
- Some people do not support the use of null in object-oriented programming, because this style of programming requires the value to always point to the object. [2] X Research Sources[3] X Research Sources
This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This post has been viewed 7,547 times.
Null denotes variables that are not object-oriented and contain no value. You can use a basic ‘if’ statement to check for a null value in a piece of code. Null is often used to indicate or determine the non-existence of some value. With such a context, null can be used as a condition to start or end other processes in the code. [1] X Research Source
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