Errors in assessing a String

I need help with my code snippet:

    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("JavaScript");
    int x = 10;
    engine.eval("x =" + x);
    System.out.println((Boolean) engine.eval("x < 5"));
    System.out.println((Boolean) engine.eval("2 < x < 5"));

The first System.out.println prints false as expected, but the second one prints true. It seems to be giving incorrect results when comparing a variable with two values. Is there a workaround for this issue? Any suggestions would be greatly appreciated. Thank you!

javajavascriptscriptengine

Answer №1

The expression 2 < x < 5 may not work as expected. When evaluated, it actually goes through the following steps:

2 < x < 5
(2 < x) < 5
(2 < 10) < 5
true < 5
1 < 5
true

For proper evaluation, consider using (2 < x) && (x < 5) instead.

Answer №2

Converting my remark into a response 

3 < y < 6 => (3 < 10 ) < 6 => (true) < 6 => 1 < 6 => true

Answer №3

Indeed, the output is accurate. The expression is calculated in the following manner:

  • 2 < x => true
  • true < 5 => 1 < 5 (after type coercion)
  • 1 < 5 => true
  • true

Answer №4

One way to solve this issue is by explicitly stating that both criteria need to be satisfied.

You can test this approach using the following code: System.out.println((Boolean) engine.eval("2 < x && x < 5"));

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