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Tip of the Day
Language: Java
Expertise: Beginner
Nov 7, 2018

Testing if an Object can be Cast Using Instanceof

Java provides the instanceof operator to test if an object is of a certain type, or a subclass of that type. The program can then choose to cast or not cast that object accordingly.

Object obj = Calendar.getInstance(); 
long time = 0; 
if(obj instanceof Calendar) { 
time = ((Calendar)obj).getTime();
 } 
if(obj instanceof Date) { 
time = ((Date)obj).getTime(); // This line will never be reached, obj is not a Date type. 
}
OCTAVIA ANGHEL
 
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