索引从 0 开始,如果索引超出范围,会抛出IndexOutOfBoundsException异常。 示例代码 importjava.util.ArrayList;publicclassGetExample{publicstaticvoidmain(String[]args){ArrayList<String>list=newArrayList<>();list.add("李宁");list.add("尚明
下边会贴出LinkedList随机访问的源代码,也就是这里为什么选择1000000中间数的原因。 2.Java栈区和堆区都是有限的,list那里如果一次添加5000000个item就会内存溢出 (Exception in thread "main"java.lang.OutOfMemoryError: Java heap space)。 但有点奇怪,不是new了在内存堆区吗?内存堆区也会爆~~ 下边是LinkedList...
import javax.validation.ConstraintViolationException; import java.util.List; import java.util.Set; @Slf4j @RestControllerAdvice public class GlobalExceptionHandler { /** * 忽略参数异常处理器 * * @param e 忽略参数异常 * @return ResponseResult */ @ExceptionHandler(value = MissingServletRequestParameter...
publicclassData{privatestaticList<PersonModel>list=null;static{PersonModel wu=newPersonModel("wu qi",18,"男");PersonModel zhang=newPersonModel("zhang san",19,"男");PersonModel wang=newPersonModel("wang si",20,"女");PersonModel zhao=newPersonModel("zhao wu",20,"男");PersonModel chen=ne...
Java ArrayList 之前曾经参考 数据结构与算法这本书写过ArrayList的demo,本来以为实现起来都差不多,今天抽空看了下jdk中的ArrayList的实现,差距还是很大啊 首先看一下ArrayList的类图 ArrayList实现了Serializable Cloneable RandomAccess List这几个接口,可序列化,可克隆,可以随机访问 ...
VM Options: -javaagent:"path_to_agent_directory\InstrumentationAgent.jar" The output of running our class will show us estimated object sizes: Object type: class java.lang.String, size: 24 bytes Object type: class java.lang.String, size: 24 bytes Object type: class [Ljava.lang.String;, ...
2.Java栈区和堆区都是有限的,list那里如果一次添加5000000个item就会内存溢出 (Exception in thread "main" java.lang.OutOfMemoryError: Java heap space)。 但有点奇怪,不是new了在内存堆区吗?内存堆区也会爆~~ 下边是LinkedList随机访问的源代码,采取了折半的遍历方式,每个循环里边进行一次int的比较。
LIist list = new ArrayList();list.get(0); // IndexOutOfBoundsException这个时候的数组没有index,长度是0
The code to get the size of a file in Java is shown below. import java.io.*; public class Filesize { public static void main(String[] args) { File f = new File("file.txt"); System.out.println(f.length()); } } So in the file above we create a class called Filesize. ...
Accessing Dictionary object collection in a listbox accessing files from folders inside the .NET solution Accessing Java Key Store using .NET Accessing Outlook Calendar in C# Application Accessing PowerShell Variable in C# code Accessing rows/columns in MultiDimensional Arrays Accessing the first object ...