这段代码如何优化？

public void run() {
    try {
        WsRequest req=new WsRequest(xmlText);
        System.err.println(req.getCode());
        System.err.println(req.getNodes("MoSms"));
    } catch (Exception e) {
        e.printStackTrace();
    }
}

上面这段代码是每隔30秒就执行一次的。也就是说WsRequest对象一直被new这样子会影响内存和系统性能，如何优化这段代码呢？

单例模式：
[code="java"]public class Singleton{
private Singleton(){
generator = new Random();
}
public void setSeed(int seed){
generator.setSeed(seed);
}
public int nextInt(){
return generator.nextInt();
}
public static synchronized Singleton getInstance(){
if (instance == null) {
instance = new Singleton();
}
return instance;
}
private Random generator;
private static Singleton instance;
}
客户端调用的代码：
package singleton;
public class Client{
public static void main(String[] args){
Singleton s1 = Singleton.getInstance();
System.out.println(s1.toString());
for(int i=0;i<10;i++){
Singleton s2 = Singleton.getInstance();
System.out.println("The randomed number is "+s2.toString());
}
}
}[/code]

运用单例，每次使用同一个对象，是这个意思吧

WsRequest 是自己编写的吧，你可以写一个方法让客户端每次取的都是同一个对象

WsRequest类能修改么？
我大致写一下

private static WsRequest wr = new WsRequest();

public static WsRequest getInstance(){
return wr;
}

客户端调用

WsRequest wr = WsRequest.getInstance();

WsRequest写成单例模式的
[code="java"]public class WsRequest
{
private static WsRequest wsRequest = new WsRequest();
private String xmlText;
private WsRequest(String xmlText)
{
this.xmlText = xmlText;
//TODO
}

public static synchronized WsRequest getInstance(String xmlText)
{
   if (wsRequest != null) 
   {  
       wsRequest.setXmlText(xmlText);  
       return this.wsRequest;
   }
    this.wsRequest = new WsRequest();
    return this.wsRequest;
}

public void setXmlText(String xmlText)
{
    this.xmlText = xmlText;
} 

}

public void run() {
try {
WsRequest req=WsRequest.getInstance();
System.err.println(req.getCode());
System.err.println(req.getNodes("MoSms"));
} catch (Exception e) {
e.printStackTrace();
}
} [/code]

改成单例模式还不行吗？ :o