hello2008world的专栏

1、a.retainAll(Countries.names(25));取两个对象的交集2、listIterator(int index)方法      ListIteratorString> java.util.List.listIterator(int index)Returns a list iterator of the elements in this list (in p

SortedSet的方法：1、SortedSetString> java.util.SortedSet.subSet(String fromElement,String toElement)Returns a view of the portion of this sorted set whose elements range from fromElement, inclusi

package io;//: io/GZIPcompress.java// {Args: GZIPcompress.java}import java.util.zip.*;import java.io.*;import java.nio.ByteBuffer;import java.nio.channels.FileChannel;public class GZ

package io;//: io/LockingMappedFiles.java// Locking portions of a mapped file.// {RunByHand}import java.nio.*;import java.nio.channels.*;import java.io.*;public class LockingMappedFi

package test;import java.util.*;/** * 生成不重复随机数的一种算法。 * */public class Test2 { public static void main(String[] args) { // 要排序的一组数字 String[] seed = { "a", "b", "c", "d", "e", "

package io;import java.util.prefs.*;import static net.mindview.util.Print.*;public class PreferencesDemo { public static void main(String[] args) throws Exception { Preferences prefs =

在Think in java中的基础上做了一些调整 package enumerated;//: enumerated/OzWitch.java// The witches in the land of Oz.import static net.mindview.util.Print.*;public enum OzWitch { // Instances mu

实现类：//: net/mindview/util/Enums.javapackage net.mindview.util;import java.util.*;public class Enums { private static Random rand = new Random(47); public static > T random(Class ec) {