0 Clearing arraylist also clears object arraylist -1 How to get an array list and copy elements to a new list? 0 Return segment from an arrayList with subList vs removeRange See more linked questions Related 5 Java - copying arraylist objects 4 Java Arraylist - Copy one to another wi...
ArrayList类实现了Cloneable接口,这意味着我们可以使用clone()方法来复制一个ArrayList。以下是使用clone()方法复制ArrayList的示例代码: ArrayList<String>originalList=newArrayList<>();originalList.add("apple");originalList.add("banana");originalList.add("orange");ArrayList<String>copyList=(ArrayList<String>)o...
方法一:使用序列化和反序列化 importjava.io.*;publicclassDeepCopyUtil{publicstatic<T>ArrayList<T>deepCopy(ArrayList<T>original){try{ByteArrayOutputStreambos=newByteArrayOutputStream();ObjectOutputStreamoos=newObjectOutputStream(bos);oos.writeObject(original);oos.flush();ByteArrayInputStreambin=newByteAr...
Collections.copy(copyobjectList, objectList); copyobjectList.get(0).setName("e"); log.info("{}",objectList); log.info("{}",copyobjectList); } 使用stream 我们也可以使用java 8引入的stream来实现: @Test public void withStream(){ List<CustBook> objectList=new ArrayList<>(Arrays.asList(n...
public class anObject { private String name; private ArrayList<String> myList = new ArrayList<String>(); } I have a constructor: public anObject() { name = ""; } I have my copy constructors: public anObject(anObject copy) { this(); newObject(copy); } public void newObject(an...
[Java错误]Collections的copy方法拷贝ArrayList 抛出IndexOutOfBoundsException异常 昨天在安卓应用中发现了一个bug,找了很久才发现原因,页面A将一个list传给页面B,页面B直接使用了这个list引用,快键键可以直接进去B页面,快捷键进入B页面就报错了,最后发现是我在页面A中将list clear掉了,索性想复制一个...
之所以叫CopyOnWrite就是因为很多方法都是通过Array.copy或者System.arraycopy,操作中有数组的 拷贝,所以写的操作效率很低 例子 packagejavalearn.javabase.concurrent;importlombok.extern.slf4j.Slf4j;importjava.util.ArrayList;importjava.util.Iterator;importjava.util.List;importjava.util.concurrent.CopyOnWriteArrayList...
import java.util.*; // Creating an enum of GFG type enum GFG { Welcome, To, The, World, of, Geeks } ; public class Enum_Set_Demo { public static void main(String[] args) { // Creating an empty collection Collection<GFG> collect = new ArrayList<GFG>(); // Adding elements to th...
importjava.util.*;publicclassListTest1{publicstaticvoidmain(String[]args){List<String>stringArrayList=newArrayList<>();for(int i=0;i<100000;i++){stringArrayList.add("hello");}System.out.println(stringArrayList.get(0));}} 调试代码V2
Java program to create adeep copy of an arraylist. ArrayList<Employee>employeeList=newArrayList<>();employeeList.add(newEmployee(1l,"adam",newDate(1982,02,12)));ArrayList<Employee>employeeListClone=newArrayList<>();Collections.copy(employeeList,employeeListClone);//Modify the list item in cloned...