代码优化：重复代码封装成函数

优化前的代码：
WorkDemo wd0 = new WorkDemo("采集节点一");  
WorkDemo wd1 = new WorkDemo("采集节点二");  
WorkDemo wd2 = new WorkDemo("采集节点三");  
WorkDemo wd3 = new WorkDemo("采集节点四");  
WorkDemo wd4 = new WorkDemo("采集节点五");  
WorkDemo wd5 = new WorkDemo("采集节点六"); 
WorkDemo wd6 = new WorkDemo("采集节点七");
WorkDemo wd7 = new WorkDemo("采集节点八");
WorkDemo wd8 = new WorkDemo("采集节点九");
WorkDemo wd9 = new WorkDemo("采集节点十");

wd0.waitWorking("localhost",2000,"WorkDemo"); 
wd1.waitWorking("localhost",2001,"WorkDemo"); 
wd2.waitWorking("localhost",2002,"WorkDemo");  
wd3.waitWorking("localhost",2003,"WorkDemo");  
wd4.waitWorking("localhost",2004,"WorkDemo");  
wd5.waitWorking("localhost",2005,"WorkDemo");  
wd6.waitWorking("localhost",2006,"WorkDemo"); 
wd7.waitWorking("localhost",2007,"WorkDemo"); 
wd8.waitWorking("localhost",2008,"WorkDemo"); 
wd9.waitWorking("localhost",2009,"WorkDemo"); 

优化之后：
newWorkDemo(10);

public static void newWorkDemo(int n){
for(int i=0; i<n; i++){
WorkDemo wd = new WorkDemo("采集节点"+i+":");
wd.waitWorking("localhost",2000+i,"WorkDemo"); 
}
}