map初始化时直接put

[qq_23204557]

final Map<Character, Character> endStart =
new HashMap<Character, Character>() {{
put(')','(');
put(']','[');
put('}','{');
}};

请问为什么可以这样操作？红色的两重花括号怎么解释？

[AI-Neura]

我觉得双括号是二维数组String[][] strings={{"1","2"}};

[臭小子帅]

https://blog.csdn.net/liubo2012/article/details/8591956 看下这个

[臭小子帅]

https://blog.csdn.net/wuxianjiezh/article/details/90267142 还有这个