private void updateMapValues(TestMap.Builder builder) {
    builder.getMutableInt32ToInt32Field().put(1, 111);
    builder.getMutableInt32ToInt32Field().remove(2);
    builder.getMutableInt32ToInt32Field().put(4, 44);

    builder.getMutableInt32ToStringField().put(1, "111");
    builder.getMutableInt32ToStringField().remove(2);
    builder.getMutableInt32ToStringField().put(4, "44");

    builder.getMutableInt32ToBytesField().put(1, TestUtil.toBytes("111"));
    builder.getMutableInt32ToBytesField().remove(2);
    builder.getMutableInt32ToBytesField().put(4, TestUtil.toBytes("44"));

    builder.getMutableInt32ToEnumField().put(1, TestMap.EnumValue.BAR);
    builder.getMutableInt32ToEnumField().remove(2);
    builder.getMutableInt32ToEnumField().put(4, TestMap.EnumValue.QUX);

    builder.getMutableInt32ToMessageField().put(1, MessageValue.newBuilder().setValue(111).build());
    builder.getMutableInt32ToMessageField().remove(2);
    builder.getMutableInt32ToMessageField().put(4, MessageValue.newBuilder().setValue(44).build());

    builder.getMutableStringToInt32Field().put("1", 111);
    builder.getMutableStringToInt32Field().remove("2");
    builder.getMutableStringToInt32Field().put("4", 44);
  }
  private void setMapValues(TestMap.Builder builder) {
    builder.getMutableInt32ToInt32Field().put(1, 11);
    builder.getMutableInt32ToInt32Field().put(2, 22);
    builder.getMutableInt32ToInt32Field().put(3, 33);

    builder.getMutableInt32ToStringField().put(1, "11");
    builder.getMutableInt32ToStringField().put(2, "22");
    builder.getMutableInt32ToStringField().put(3, "33");

    builder.getMutableInt32ToBytesField().put(1, TestUtil.toBytes("11"));
    builder.getMutableInt32ToBytesField().put(2, TestUtil.toBytes("22"));
    builder.getMutableInt32ToBytesField().put(3, TestUtil.toBytes("33"));

    builder.getMutableInt32ToEnumField().put(1, TestMap.EnumValue.FOO);
    builder.getMutableInt32ToEnumField().put(2, TestMap.EnumValue.BAR);
    builder.getMutableInt32ToEnumField().put(3, TestMap.EnumValue.BAZ);

    builder.getMutableInt32ToMessageField().put(1, MessageValue.newBuilder().setValue(11).build());
    builder.getMutableInt32ToMessageField().put(2, MessageValue.newBuilder().setValue(22).build());
    builder.getMutableInt32ToMessageField().put(3, MessageValue.newBuilder().setValue(33).build());

    builder.getMutableStringToInt32Field().put("1", 11);
    builder.getMutableStringToInt32Field().put("2", 22);
    builder.getMutableStringToInt32Field().put("3", 33);
  }