How to read the value of a private field from a different class in Java?

Question

I have a poorly designed class in a 3rd-party JAR and I need to access one of its private fields. For example, why should I need to choose priv

Answer 1

You can use Manifold's @JailBreak for direct, type-safe Java reflection:

@JailBreak Foo foo = new Foo();
foo.stuffIWant = "123;

public class Foo {
    private String stuffIWant;
}

@JailBreak unlocks the foo local variable in the compiler for direct access to all the members in Foo's hierarchy.

Similarly you can use the jailbreak() extension method for one-off use:

foo.jailbreak().stuffIWant = "123";

Through the jailbreak() method you can access any member in Foo's hierarchy.

In both cases the compiler resolves the field access for you type-safely, as if a public field, while Manifold generates efficient reflection code for you under the hood.

Discover more about Manifold.