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Thread-safe singleton

Theory

Construct an on-demand initialization

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Construct on-demand initialization. Put the getInstance method as the first class member.

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                return NestedSingletonHelper.singletonObject;
              
                public class Singleton {
              
                public static Singleton getInstance() {
              
                }
              
                public static Singleton singletonObject = new Singleton();
              
                }
              
                private static class NestedSingletonHelper {
              
                }
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