1.float _top=23.9 float类型后面应该加f 小数不然默认为double
2.System.out.println(5+7+"tarena"+5+7);
+两边为数字做加法运算,一边有字符串就做连接
3.
posted on 2017-06-26 21:50 独舞miss 阅读(139) 评论(0) 编辑 收藏 举报
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