How to Execute Java Code Stored as a String?

Executing Code from a String

Suppose you have a piece of Java code stored within a String variable, like:

<code class="java">String javaCode = "if(polishScreenHeight >= 200 && " +
    "polishScreenHeight <= 235 && polishScreenWidth >= 220) { }";</code>

Can you transform this String into a Java statement and execute it?

Using the Compiler API

One approach is to leverage the Java Compiler API. This API allows you to compile and evaluate code dynamically. You can compile the Java code in your String into a Java class, create an instance of that class, and execute the method containing the code you want to run.

Alternative: Beanshell

Alternatively, you can consider using Beanshell, a Java-like scripting language that can be embedded within Java applications. Beanshell enables on-the-fly evaluation of Java code from Strings. You can run the Java code in your String by simply using Beanshell's "eval" method.

Beanshell, while not actively developed, has proven to be a reliable tool in production environments, providing a quick and convenient way to dynamically execute code from Strings in a Java context.

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