}//指定集合元素的列表publicArrayList(Collection<? extends E> c){//将参数中的集合转化为数组赋给elementDataelementData = c.toArray();//参数集合是否是空if((size = elementData.length) !=0) {// 如果elementData类型不是Object数组if(elementData.getClass() != Object[].class)// 不为Object数组的话...
首先我们将ArrayList中的泛型指定为基本数据类型的包装类和我们自定义的一个User类: publicclassArrayListTest{staticclassUser{privateStringname;privateintage;publicUser(Stringname,intage){this.name=name;this.age=age;}@OverridepublicStringtoString(){return"User{"+"name='"+name+'\''+", age="+age+'}'...
首先我们将ArrayList中的泛型指定为基本数据类型的包装类和我们自定义的一个User类: publicclassArrayListTest{staticclassUser{privateStringname;privateintage;publicUser(Stringname,intage){this.name=name;this.age=age;}@OverridepublicStringtoString(){return"User{"+"name='"+name+'\''+", age="+age+'}'...
cursor; ArrayList.this.add(i, e); cursor = i + 1; lastRet = -1; expectedModCount = modCount; } catch (IndexOutOfBoundsException ex) { throw new ConcurrentModificationException(); } } } /** * Returns a view of the portion of this list between the specified * {@code ...
Lets write the complete code: importjava.util.*;classJavaExample{publicstaticvoidmain(Stringargs[]){ArrayList<String>arrList=newArrayList<String>();arrList.add("Steve");arrList.add("Tim");arrList.add("Lucy");arrList.add("Pat");arrList.add("Angela");arrList.add("Tom");//displaying ele...
Example 2: Split a Single ArrayList into Two ArrayLists import java.util.ArrayList; class Main { public static void main(String[] args) { // create an ArrayList ArrayList<Integer> ages = new ArrayList<>(); // add some elements to the ArrayList ages.add(10); ages.add(12); ages.add(...
ArrayList类有三个构造方法: // 1.构造一个初始容量为 10 的空列表。 public ArrayList() { /* * 因为DEFAULTCAPACITY_EMPTY_ELEMENTDATA = {}; * 所以此时ArrayList的容量为0,只有当向容器中添加元素时, * 即调用add(E e) 时,通过Arrays.copyOf(elementData, newCapacity), ...
importjava.util.ArrayList;importjava.util.List;publicclassTestIP{//Java实现解析IP地址的方法,给出一串数字,通过方法生成正确的IP地址publicList<String>restoreIpAddresses(String s){ArrayList<ArrayList<String>>result=newArrayList<ArrayList<String>>();ArrayList<String>t=newArrayList<String>();dfs(result,s,0...
Class ArrayList<E> All Implemented Interfaces: Serializable,Cloneable,Iterable<E>,Collection<E>,List<E>,RandomAccess Direct Known Subclasses: AttributeList,RoleList,RoleUnresolvedList public classArrayList<E>extendsAbstractList<E> implementsList<E>,RandomAccess,Cloneable,Serializable ...
Java开发规范02 - 集合篇_ArrayList#subList 坑 Arrays.subList 规则 Code 基本使用 注意事项 修改原集合元素的值,会影响子集合修改原集合的结构,会引起ConcurrentModificationException异常修改子集合元素的值,会影响...