Spring 5.0.8.RELEASE文档 Core1-1.4.2 详细的依赖关系和配置（后续）

版权声明：mj1001001 https://blog.csdn.net/qq_42786889/article/details/82593380

Strongly-typed collection
With the introduction of generic types in Java 5, you can use strongly typed collections. That is, it is possible to declare a Collection type such that it can only contain String elements (for example). If you are using Spring to dependency-inject a strongly-typed Collection into a bean, you can take advantage of Spring’s type-conversion support such that the elements of your strongly-typed Collection instances are converted to the appropriate type prior to being added to the Collection.

强类型集合
通过在Java 5中引入泛型类型，您可以使用强类型集合。也就是说，它可以声明一个托收类型，这样它只能包含字符串元素（例如）。如果您正在使用Spring来依赖于bean，那么您可以利用Spring的类型转换支持，这样您的强类型集合实例的元素在被添加到集合之前就被转换成适当的类型。

public class Foo {

    private Map<String, Float> accounts;

    public void setAccounts(Map<String, Float> accounts) {
        this.accounts = accounts;
    }
}

<beans>
    <bean id="foo" class="x.y.Foo">
        <property name="accounts">
            <map>
                <entry key="one" value="9.99"/>
                <entry key="two" value="2.75"/>
                <entry key="six" value="3.99"/>
            </map>
        </property>
    </bean>
</beans>

When the accounts property of the foo bean is prepared for injection, the generics information about the element type of the strongly-typed Map