一个例子 public class TestString{ public static void main(String[] args){ String a = "a"; String b = a+"b"; String c = "ab"; String d = "a" + "b"; System.out.println(c == d); //true!!!! System.out.println(c ==…
今天和同事在关于foreach编译后是for循环还是迭代器有了不同意见,特做了个Demo,了解一下. 是啥自己来看吧! public class Demo { public static void main(String[] args) { int[] ints = new int[5]; for (int s : ints) { System.out.println(s); } String[] intss = new String[5]; for (String s : intss) { S…
1.问题引入: 运行一个maven+springmvc+hibernate的项目的时候出现了下边的错误: Caused by: java.io.FileNotFoundException: class path resource [com/zju/iot/config/User.hbm.xml] cannot be opened because it does not exist at org.springframework.core.io.ClassPathResource.getInputS…
