List接口

List

List list = new ArrayList();

list.add("");可以在list数组后加入元素

list.get(3);可以获取list数组中的第4个元素

list.add(1,"");在1后面插入

list.lastIndexOf("obj");可以查找index的位置

list.remove(1);移除位置为1的元素，并返回此元素

list.set(1,"obj");设置位置为1的元素为obj，相当于是替换

List subList(int fromIndex,int toIndex); 返回从fromIndex到toIndex位置的子集合

package com.edu.enum_;import java.util.ArrayList;
import java.util.List;/*** @author JQY* @version 1.0*/
public class Homework01 {public static void main(String[] args) {List list = new ArrayList();list.add("Hello1");list.add("Hello2");list.add("Hello3");list.add("Hello4");list.add("Hello5");list.add("Hello6");list.add("Hello7");list.add("Hello8");list.add("Hello9");list.add("Hello10");System.out.println("list = "+list);list.add(1,"韩顺平教育");System.out.println(list.get(4));list.remove(5);list.set(6,"hhhh");System.out.println("list = "+list);}
}

package com.edu.enum_;import java.util.ArrayList;
import java.util.List;/*** @author JQY* @version 1.0*/
public class Homework01 {public static void main(String[] args) {List list = new ArrayList();list.add(new Book("三国演义","罗贯中",33));list.add(new Book("西游记","吴承恩",30));list.add(new Book("水浒传","施耐庵",35));list.add(new Book("红楼梦","曹雪芹",36));for(Object o : list){System.out.println(o);}sort(list);//对集合进行排序for(Object o : list){System.out.println(o);}}public static void sort(List list){int listSize = list.size();for (int i = 0; i < listSize-1; i++) {for (int j = 0; j < listSize-1-i; j++) {//取出对象Book book1 = (Book)list.get(j);Book book2 = (Book)list.get(j+1);if(book1.getPrice()> book2.getPrice()){list.set(j,book2);list.set(j+1,book1);}}}}}
class Book{private String name;private String author;private double price;public Book(String name, String author, double price) {this.name = name;this.author = author;this.price = price;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getAuthor() {return author;}public void setAuthor(String author) {this.author = author;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}@Overridepublic String toString() {return "名称：" +name +"    价格：" + price +"    作者："+author;}
}

其他两种把Arraylist改成Vector或Linkedlist即可。

在开发中，需要线程同步安全时。考虑使用Vextor。