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Because when you call getSingleInstance(), it will return a new object every time. In other words, you can make an unlimited number of objects with that method.
By making a private object (in this case, the object "instance"), your function doesn't return a new object each time - it returns the only Singleton object available, which is "instance" and you can't make any more objects from the Singleton class (which is exactly the idea behind the Singleton pattern).
I hope this cleared up any confusion.
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Java Singleton Pattern
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Because when you call getSingleInstance(), it will return a new object every time. In other words, you can make an unlimited number of objects with that method.
By making a private object (in this case, the object "instance"), your function doesn't return a new object each time - it returns the only Singleton object available, which is "instance" and you can't make any more objects from the Singleton class (which is exactly the idea behind the Singleton pattern).
I hope this cleared up any confusion.