public Task clone(){
		Task t = new Task();
		t.tno = this.tno;
		t.pno = this.pno;
		t.title = this.title;
		t.uiProtoUrl = this.uiProtoUrl;
		t.content = this.content;
		t.startDate = this.startDate;
		t.endDate = this.endDate;
		t.status = this.status;
		return t;
	}