import java.lang.reflect.Field;

public class AksesInteger {
    public static void main(String[] args) throws Exception {
        Integer kotak = 42;
        Field field = Integer.class.getDeclaredField("value");
        field.setAccessible(true); // mencoba membuka internals java.lang
        int nilai = field.getInt(kotak);
        System.out.println("nilai = " + nilai);
    }
}