如何通过函数调用输出序列号？

Question

这是我的类IpdurationAccess的代码如何通过函数调用输入序列号？

public class IpDurationAccess {
String clientAddress;
int duration;

public IpDurationAccess(String s,int b)
{
    this.clientAddress=s;
    this.duration=b;
}

public String getClientAddress() {
    return clientAddress;
}
public void setClientAddress(String clientAddress) {
    this.clientAddress = clientAddress;
}
public int getDuration() {
    return duration;
}
public void setDuration(int duration) {
    this.duration = duration;
}

public void displayContent()
{
    System.out.print( clientAddress+"\t");
    System.out.print(duration);
    System.out.println();

}
}

返回此代码我希望输出IP地址，持续时间以及序列号。如何使用displaycontent()方法？

      Iterator iterator;
      System.out.println("IP Address \t Bytes Used ");  
        iterator = logarray.iterator();  
        int count = 1;
        while (iterator.hasNext())
        {
            IpDurationAccess item= (IpDurationAccess)iterator.next();

            item.displayContent();
        }