4) Using Variables and assignment Operator

Variable’s that are put into Jexl Context can be used in the JexlExpression. We can also use the assignment operator, to assigne the value of a variable to other variable.

public static void main(String[] args) {

	`JexlContext context = new MapContext();`
	`context.set("x", 1);`
	`context.set("y", 2);`
	`context.set("name", "Tony");`
	`context.set("firstName", "Stark");`

	`JexlEngine jexl = new JexlBuilder().create();`

	`JexlExpression e = jexl.createExpression("x = y ");`
	`e.evaluate(context);`

	`e = jexl.createExpression(" name =firstName ");`
	`e.evaluate(context);`

	`System.out.println("x\t::" + context.get("x"));`
	`System.out.println("y\t::" + context.get("y"));`
	`System.out.println("name\t::" + context.get("name"));`
	`System.out.println("name\t::" + context.get("firstName"));`

}

In the above program, we have set the value’s of x, y, name, firstName to 1, 2, Tony, Stark.

When Jexl evalute the expression “x = y” and “name = firstName” , then the value of y and firstname are assigned to x and name respecitvely.

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Output:

x ::2 y ::2 name ::start name ::start