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What is instanceof operator in Java? Explain.
The instanceof operator in Java is used to find whether a reference is an instance of a Type i.e. class or an interface.
Example
public class InstanceOfExample {
public static void main(String args[]) {
String str = "hello";
boolean bool = str instanceof String;
System.out.println(bool);
}
}Output
true
Legal operands of the instanceof operator
The following are the only legal operands of the instanceof operator −
- Left operand − It must be a reference representing an object.
- Right operand − It must be the name of Java class or, interface.
Except these two if you use any other operands a compile time error will be generated.
Example
public class InstanceOfExample {
public static void main(String args[]) {
int i =20;
boolean bool = i instanceof String;
System.out.println(bool);
}
}Compile time error
InstanceOfExample.java:4: error: unexpected type
boolean bool = i instanceof String;
^
required: reference
found: int
1 error
Updated on 30-Jul-2019 22:30:26
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