EnvironmentEntryInitializingTreeMap.java 文件源码

@Override
public T get(Object key) {
    if (!this.delegate.containsKey(key) && key instanceof String) {
        T entry = BeanUtils.instantiateClass(entryClass);
        Binder binder = new Binder(ConfigurationPropertySources.get(environment),new PropertySourcesPlaceholdersResolver(environment),this.conversionService);
        binder.bind(defaultsPrefix, Bindable.ofInstance(entry));
        this.delegate.put((String) key, entry);
    }
    return this.delegate.get(key);
}