xu1314的专栏

package itat;public class Example9_1 { /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub  lefthand lh=new lefthand();  righthand rh=new righthan

 package itat.s11_8;import java.awt.Button;import java.awt.Frame;import java.awt.TextArea;import java.awt.TextField;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java

 package itat;public class Example9_3 { /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub  Bank bank=new Bank();  bank.setMoney(300);  bank.kuai

 package itat;public class Example9_9 { /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub  A1 a=new A1();  a.students.start();  a.teacher.start(

 package itat;public class Example9_19 { /**线程联合  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub  ThreadJoin a=new ThreadJoin();  a.customer.start

 package itat;import java.awt.BorderLayout;import java.awt.Button;import java.awt.Frame;import java.awt.Panel;import java.awt.TextArea;import java.awt.event.ActionEvent;import java.awt.event.ActionL

 package itat;import java.awt.BorderLayout;import java.awt.Button;import java.awt.Frame;import java.awt.TextArea;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.aw

package itat;public class Example9_20 { /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub  Daemon a=new Daemon();  a.A.start();     a.B.setDaemo

 package itat;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import javax.swing.ProgressMonitor;import javax.swing.ProgressMonitorInputStream;publ

<br />以下假设jad.exe在c:/java目录下 <br />一、基本用法 <br />Usage:    jad [option(s)] <br />直接输入类文件名，且支持通配符，如下所示。 <br />c:/java/>jad example1.class <br />c:/java/>jad *.class <br />结果是将example1.class反编译为example1.jad。将example1.jad改为example1.java即得源 <br /><br />文件。 <br

<br />JDK 6 下载地址 : http://192.18.108.226/ECom/EComTicketServlet/BEGIN09ADF70D9B1FA6A7E6AF021DA72CD4BF/-2147483648/2531720943/1/852470/852290/2531720943/2ts+/westCoastFSEND/jdk-6u3-oth-JPR/jdk-6u3-oth-JPR:1/jdk-6u3-windows-i586-p.exe<br />TOMCAT 6下载地址: http

1：点击project->clean清除部署文件2：检查project properties->java build path->source 是否指向src3：检查project properties->java build path->libraries看所有的库包是否正确导入，有问题在java build path里有叹号，我这次是因为里面的jre有叹号，重新加一遍jre就可以了

The CATALINA_HOME environment variable is not defined correctly问题:今天配置tomcat运行环境时出现了下边的问题,The CATALINA_HOME environment variable is not defined correctlyThis environment variable is needed to ru

Java Heap分为3个区，Young，Old和Permanent。Young保存刚实例化的对象。当该区被填满时，GC会将对象移到Old区。Permanent区则负责保存反射对象。JVM的Heap分配可以使用-X参数设定，-Xms初始Heap大小-Xmxjava heap最大值-Xmnyoun

= GC基础 ===================== JAVA堆的描述如下：内存由 Perm和 Heap组成.其中Heap = {Old + NEW = { Eden , from, to } }JVM内存模型中分两大块，一块是 NEW Generation,另一块是Old Generation.在New Generation中，有一个叫Eden

作者：Ken WuEmail: ken.wug@gmail.com转载本文档请注明原文链接 http://kenwublog.com/docs/java6-jvm-options-chinese-edition.htm！ 本文是基于最新的SUN官方文档Java SE 6 Hotspot VM Options 编写的译文。主要介绍JVM中的非稳态选项及其使用说明。为了让读者明

设置JVM不同的参数值，进行20户并发持续5分钟压力测试，观察结果 1、-Xms256m -Xmx256m -Xmn200m   FGC次数：95次   GC次数：11次   平均响应时间：2.41S   TPS：8.195   点击率：753.99    2、-Xms256m -Xmx256m –Xmn64m   FGC次数：2次   GC

package itat;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;public class Example10_7

 package itat;public class Example9_16 { /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub  MyThread thread1=new MyThread();  thread1.setName("张

 package itat;public class Example9_15 { /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub  int m=0;  A target=new A();     target.name="张三";   

 package itat;public class Example9_5 { /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub  Move move=new Move();  move.zhangsan.start();  move.l

 package itat;public class Example9_6 { /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub  Number number=new Number();  number.giveNumberThread.

 package itat;public class Example9_7 { /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub  ComputerSum1 sum=new ComputerSum1();  sum.computer1.s

 package itat;import java.awt.Button;import java.awt.FlowLayout;import java.awt.Frame;import java.awt.Label;import java.awt.TextField;import java.awt.event.ActionEvent;import java.awt.event.ActionLi

 package itat;import java.awt.Canvas;import java.awt.Color;import java.awt.Frame;import java.awt.Graphics;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;public class Example

 package itat;import java.awt.Button;import java.awt.FlowLayout;import java.awt.Frame;import java.awt.TextArea;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.

 package itat;import java.awt.Button;import java.awt.Color;import java.awt.FlowLayout;import java.awt.Frame;import java.awt.Label;import java.awt.event.ActionEvent;import java.awt.event.ActionListen

 package itat;import java.awt.Button;import java.awt.FlowLayout;import java.awt.Frame;import java.awt.TextField;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt

 package itat;import java.io.File;import java.io.IOException;public class Example10_3 { /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub  Run

 package itat;import java.awt.*;import java.awt.event.*;import java.io.*;import javax.swing.Box;public class Example10_12 { /**  * @param args  */ public static void main(String[] args) { 

package itat;import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;public class Example15_1 { /**  * @param ar

 package itat.s11_7;import java.io.FileInputStream;import java.io.IOException;import java.net.ServerSocket;import java.net.Socket;import java.util.zip.ZipEntry;import java.util.zip.ZipOutputStream;

package itat.s11_6;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.net.ServerSocket;import java.net.Socket;import java.util.StringTokenizer;pu

package itat.s11_5;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.net.ServerSocket;import java.net.Socket;public class Server { /**  * @par

package itat;public class Example9_2 { /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub   People teacher,student;  ComputerSum sum=new ComputerSu

 package itat;public class Example9_4 { /**  * @param args  */ public static void main(String[] args) {  // TODO Auto-generated method stub  Thread threadA,threadB,threadC,threadD;  TargetObject

打印gc log的详细信息Java代码   set JAVA_OPTS=-XX:PermSize=64M -XX:MaxPermSize=128m -Xms512m -Xmx1024m -XX:+PrintGCDetails   或 引用set JAVA_OPTS=-XX:PermSize=64M -XX:MaxPermSize=128m -Xms512