[Ch15b] Checking that even if the fields aren't private, the still can't be changed.

package ch15b;

public class ImmutableData {

  private final String name;

  private final int value;

  final String name;

  final int value;

  public ImmutableData(String name, int value) {

    this.name = name;

package ch15b;

import org.junit.jupiter.api.Test;

class ImmutableDataTest {

  @Test

  void shouldNotBeAbleToChangeTheNotPrivateFields() {

    ImmutableData immutableData = new ImmutableData("theName", 7);

    // does not compile, yay!

//    immutableData.value = 8;

  }

}

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