Purpose of ‘instanceof’ keyword in java

Explain the purpose of ‘instanceof’ keyword in java. Provide an example.

The instanceof keyword is used to check the type of an instance of an object.

String s = "XYZ";
if (s instanceof java.lang.String)
returns TRUE.
But, using instanceof on a null reference variable returns FALSE

String s = null;
if (s instanceof java.lang.String)
returns FALSE
In a parent child relationship the instanceof would return TRUE.

if (child instanceof Parent)
returns TRUE
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