Code example for HashSet

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	private String description; 
	private Long id; 
	private Category category; 
	private Set bids = new HashSet(); 
	private Set comments = new HashSet(); 
 
	public String getDescription() { 
		return description; 
	} 
 
	public void setDescription(String description) { 
		this.description = description; 
	} 
 
	public Long getId() { 
		return id; 
	} 
 
	public void setId(Long id) { 
		this.id = id;