spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/ConfigurationPropertiesBinderBuilder.java
/**
	 * Specify the {@link ConversionService} to use or {@code null} to use the default.
	 * <p>
	 * By default, use a {@link ConversionService} bean named
	 * {@value #CONVERSION_SERVICE_BEAN_NAME} if any. Otherwise create a
	 * {@link DefaultConversionService} with any {@link ConfigurationPropertiesBinding}
	 * qualified {@link Converter} and {@link GenericConverter} beans found in the
	 * context.
	 * @param conversionService the conversion service to use or {@code null}
	 * @return this instance
	 */
Specify the  ConversionService to use or  null to use the default.

By default, use a  ConversionService bean named
#CONVERSION_SERVICE_BEAN_NAME if any. Otherwise create a
DefaultConversionService with any  ConfigurationPropertiesBinding
qualified  Converter and  GenericConverter beans found in the
context.
@param conversionService the conversion service to use or  null
@return this instance
Specify the ConversionService to use or null to use the default . By default use a ConversionService bean named #CONVERSION_SERVICE_BEAN_NAME if any . Otherwise create a DefaultConversionService with any ConfigurationPropertiesBinding qualified Converter and GenericConverter beans found in the context . @param conversionService the conversion service to use or null @return this instance
ConfigurationPropertiesBinderBuilder withConversionService(
			ConversionService conversionService) {
		this.conversionService = conversionService;
		return this;
	}
ConfigurationPropertiesBinderBuilder withConversionService ( ConversionService conversionService ) { this . conversionService = conversionService ; return this ; }
Specify the {@link ConversionService} to use or {@code null} to use the default.
Specify the { @link ConversionService } to use or { @code null } to use the default .