How to create dynamic variables in Java?

Question

For example, in Haxe I can create strictly typed variables: var a:Float = 1.1; or var b:String = "hello" and also dynamic, if needed:

var d:Dynamic = true; d = 22; d = "hi";

How do I create this kind of variables in Java?

Answer 1

You can use Object

Object d = true; 
d = 22; 
d = "hi";

and you can use instanceof operator to check which type of data d is holding

Object d = true; 
System.out.println(d instanceof Boolean); // true
d = 22; 
d = "hi";       
System.out.println(d instanceof Integer); // false
System.out.println(d instanceof String);  // true

The Type Comparison Operator instanceof