Field: setBoolean(Object obj, boolean z)

 

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import java.lang.reflect.Field;

public class Main {
  public final boolean b = true;

  public static void main(String... args) {
    Main ft = new Main();
    try {
      Class<?> c = ft.getClass();
      Field f = c.getDeclaredField("b");
       f.setAccessible(true); // solution
      f.setBoolean(ft, Boolean.FALSE); // IllegalAccessException

      // production code should handle these exceptions more gracefully
    } catch (NoSuchFieldException x) {
      x.printStackTrace();
    } catch (IllegalArgumentException x) {
      x.printStackTrace();
    } catch (IllegalAccessException x) {
      x.printStackTrace();
    }
  }
}

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Field: setBoolean(Object obj, boolean z) : Field « java.lang.reflect « Java by API

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