深度解析ArrayList的扩容机制 先将旧容量右移1位，再加上旧容量就得到了新容量，正数右移1位相当于除以2，在该基础上加旧容量，则等价于新容量=旧容量*1.5，所以才有ArrayList每次扩容为旧容量的1.5倍的说法，最后调用Arrays.copyOf()方法进行拷贝，并将elementData指向新数组，而旧数组因为没有引用指向它，很快就会被垃圾收集...
ognl语法学习 Java arrays are walked from front to back Members of java.util.Collection are walked by walking their iterators Members of java.util.Map are walked by walking iterators over their values Members of java.util.Iterator and java.util.Enumeration are walked by iterating them Members of ...
List套数组 把Arraylist里面装了两个String的数组.现在要把Arraylist套出变成一个String的数组该怎么做? 我把代码全部实现写了一下，包括转换为一维数组和二维数组，可以直接copy运行，还望采纳：import java.util.ArrayList;import java.util.Arrays;import java.util.List;/** * * 开发公司：SOJSON在线工具 * 版权所有：© www.sojson.com * 博客地址：http://www.sojson.com/blog/ * * ...
手机怎么更新dns缓存文件 public interface Dns{Dns SYSTEM = new Dns(){@Override public List lookup(String hostname) throws UnknownHostException{if (hostname == null) throw new UnknownHostException("hostname == null");return Arrays.asList(InetAddress.getAllByName(hostname));}};List lookup(String hostname) throws UnknownHos...
java最新迷宫问题,英文原版求解答 import java.util.*;import java.util.regex.*;class MyPoint{public boolean visited=false;public int parentRow=-1;public int parentColumn=-1;public int x;public int y;public MyPoint(){}public MyPoint(int x,int y){this.x=x;this.y=y;}}class Maze{String[][] maze;final int...
