Building Tree Structure Domain Model

package org.schedulemanager.demo.model;

import java.util.ArrayList;
import java.util.List;

public class JobGroup extends Job {
	private List<Job> jobList;

	public JobGroup(String id, String name) {
		super(id);
		this.type = JOBGROUP;
		this.name = name;
		jobList = new ArrayList<Job>();
	}
	
	public JobGroup(String id, String name, String circle) {
		this(id, name);
		this.circle = circle;
	}
	
	public List<Job> getJobList() {
		return jobList;
	}
	public void addJob(Job job){
		if(job!=null && job.getId()!=null){
			jobList.add(job);
		}
	}
	public String getCircle() {
		return circle;
	}

	public void setCircle(String circle) {
		this.circle = circle;
	}
	public boolean removeJob(String id){
		boolean result = false;
		for(int i=0;i<jobList.size();i++){
			Job job = jobList.get(i);
			String jobId = job.getId();
			if(jobId.equals(id)){
				jobList.remove(i);
				result = true;
			}
		}
		return result;
	}
	
	public String toString() {
		return "id:" + id 
				+ ",name:" + name 
				+ ",circle:" + circle
				+ ",type:" + type ;
	}
}