import java.util.function.Supplier;

public class JdkTest { 
    private StoreView storeView; 

    class ConfigItem<T> { 
        private final Supplier<T> getter; 

        public ConfigItem(final Supplier<T> getter) { 
            this.getter = getter; 
        } 
    } 

    private ConfigItem<String> supportUser = new ConfigItem<>(() -> storeView.get()); 
    private ConfigItem<String> supportUser2 = new ConfigItem<>(storeView::get); 

    private class StoreView { 
        public String get() { 
            return "123"; 
        } 
    } 

    public static void main(String[] args) { 
        new JdkTest(); 
    } 
}