Singleton object 中的包装器变量能否在 Singleton 不是 Z37A6259CC0C1DAE299A7866648 时收集垃圾？

Question

In this Singleton instance, can this private Long severDate become garbage collected when the singleton instance is still not null?

I encountered this is in an Android app. Wondering Android OS somehow freeing unused individual memory values.

public class DataHolder {

    private static DataHolder self;

    private Long severDate; 
    private int numb;

    public static synchronized DataHolder getInstance() {
            if (self == null) {
                self = new DataHolder();
            }
            return self;
    }
 
}

Answer 1

Until "Long severDate" has a references to it, GC wont be deleting it. Now it all depends on the useCase whether u have created the instance of this singleton class in some classes or not. PS: In android make sure that u create the obj of this class in onCreate method.