StringBuilder就像PreparedStatement一样

Question

有没有办法创建像我们创建PreparedStatements的字符串？我的意思是用'？'创建整个字符串 我需要稍后插入值,然后根据条件插入此值.在StringBuilder中,我没有找到这样的功能,只是通过offset附加或插入.

Answer 1

这是来自MessageFormat的javadoc:

 int planet = 7;
 String event = "a disturbance in the Force";

 String result = MessageFormat.format(
     "At {1,time} on {1,date}, there was {2} on planet {0,number,integer}.",
     planet, new Date(), event);

输出是:

 At 12:30 PM on Jul 3, 2053, there was a disturbance in the Force on planet 7.

你可以看到简单的插入是可能的({2}),但也可以是更复杂的插入.