INSTANCEOF

The INSTANCEOF checks the class of an object.

Syntax

expr INSTANCEOF type
  1. expr can be any expression supported by the language.
  2. type is a structured user defined type or a Java class.

Usage

The INSTANCEOF operator evaluates to TRUE if the object reference is of the type or class specified.

The INSTANCEOF operator is used to check if an expression (usually, an object reference) is one of the type or class specified by type.

Example

IMPORT JAVA java.lang.Object 
IMPORT JAVA java.lang.StringBuffer 
IMPORT JAVA java.lang.Number 
MAIN
  DEFINE o java.lang.Object 
  DEFINE sb java.lang.StringBuffer 
  LET sb = StringBuffer.create()
  LET o = sb 
  DISPLAY sb INSTANCEOF java.lang.StringBuffer  -- shows 1
  DISPLAY o INSTANCEOF java.lang.StringBuffer   -- shows 1
  DISPLAY o INSTANCEOF java.lang.Number         -- shows 0
END MAIN