Why does adding a public field to an anonymous class in Java not work?

Question

I have an example class defined like below:

public class FooBar {

  void method1(Foo foo){ // Should be overwritten
    ...
  }

}

Later,

Answer 1

Try this.

@SafeVarargs
public static  void runWithObject(T object, Consumer... progs) {
    for (Consumer prog : progs)
        prog.accept(object);
}

and

runWithObject(
    new FooBar() {
        String name = null;
        @Override
        void method1(Foo foo) {
            System.out.println("name=" + name);
        }
    },
    object -> object.name = "Test",
    object -> object.method1(new Foo())
);

result:

name=Test

Or you can use var like this in Java 10 or later.

var fooBar = new FooBar() {
    public String name = null;

    @Override
    void method1(Foo foo) {
        System.out.println("name=" + name);
    }
};
fooBar.name = "Test";
fooBar.method1(new Foo());