随笔分类 -  java知识点整理

Junit:NoSuchMethodError runLeaf runChild
摘要：java.lang.NoSuchMethodError: org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runLeaf(Lorg/junit/runners/model/Statement;Lorg/junit/run 阅读全文
posted @ 2018-02-25 17:11 21heshang 阅读(513) 评论(0) 推荐(0)
Java环境变量从jdk1.7修改为1.8
摘要：https://jingyan.baidu.com/article/456c463b5088480a5931445c.html setx JAVA_HOME "C:\Program Files\Java\jdk1.8.0" setx Path "%PATH%;%JAVA_HOME%\bin"; 阅读全文
posted @ 2018-01-05 23:27 21heshang 阅读(1011) 评论(0) 推荐(0)
BigDecimalf大小的比较
摘要：Record queryCash = dao.queryCash(accountCash); BigDecimal dbMoney = queryCash.getBigDecimal("freeMoney"); BigDecimal requestMoney = new BigDecimal(acc 阅读全文
posted @ 2017-08-15 08:44 21heshang 阅读(188) 评论(0) 推荐(0)
字符串逆序输出的几种方式
摘要：1.利用StringBuilder ，StringBuffer实现翻转 String test = "wangguoshun"; StringBuilder sb = new StringBuilder(); StringBuilder reverse = sb.append(test).rever 阅读全文
posted @ 2017-08-10 22:07 21heshang 阅读(1475) 评论(0) 推荐(0)
java.lang.ArrayIndexOutOfBoundsException产生的原因
摘要：String test = "wangguoshun"; char[] array = test.toCharArray(); for(int i=array.length;i>=0;i--){ system.out.println(array[i]); } 报错： Exception in thr 阅读全文
posted @ 2017-08-10 21:39 21heshang 阅读(3218) 评论(0) 推荐(0)
oop----重载与重写
摘要：重载和重写的概念与区别 阅读全文
posted @ 2017-02-04 10:09 21heshang 阅读(220) 评论(0) 推荐(0)