Summarize the methods of using parentheses

The editor of this article will introduce to you about the simpler double bracket initialization method using anonymous inner classes in Java. Friends in need can refer to Java's collection collection framework such as set, map, and list. Provide any convenient method for initialization. Every time you create a collection, you have to add the values ​​one by one. For example, the code is as follows: Set letter=new HashSet(); letter.add('a'); letter.add('b'); //...very tedious. But with anonymous inner classes. Could be a little simpler. The code is as follows: Set letter=new HashSet() { { &

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