Java中Map初始化时直接赋值的方法

public static final Map<String, String> BANK_TYPE = new HashMap<String, String>(){undefined
    private static final long serialVersionUID = 1L;//可有可无
   {undefined
        put("ZX", "中信银行");
        put("PN", "平安银行");
        put("CB", "中国银行");
   }
};