Java Language Type Conversion Testing if an object can be cast using instanceof

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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.

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