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presentation17 - instanceof Soheil Hassas Yeganeh Computer...

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instanceof Soheil Hassas Yeganeh Computer Engineering Department Sharif University of Technology
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instanceof 2
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instanceof instanceof is a binary operator used to check the type of an object! Let’s walk through some examples. 2
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1 st Example 3 Shape.java class Shape { public static void main(){ Shape sh = new Shape(); boolean isShape = sh instanceof Shape; System.out.println(“Is” + (isShape?””:” not “) + “ shape!”); } }
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1 st Example Is shape! 3 Shape.java class Shape { public static void main(){ Shape sh = new Shape(); boolean isShape = sh instanceof Shape; System.out.println(“Is” + (isShape?””:” not “) + “ shape!”); } }
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2 nd Example 4 Circle.java class Circle extends Shape{ } Shape.java class Shape { public static void main(String[] args){ Shape sh = new Circle(); boolean isCircle = sh instanceof Circle; System.out.println(“Is” + (isCircle?””:” not “) + “ circle!”); } }
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2 nd Example instanceof checks the runtime type of an object.
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