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import java.util.Comparator;
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import java.util.Comparator;
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public class SaleReportComparator implements Comparator<ItemSale> {
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public class SaleReportComparator implements Comparator<ItemSale> {
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		public int compare(ItemSale  o1, ItemSale o2) {
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		public int compare(ItemSale  o1, ItemSale o2) {
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			System.out.println("Item 1 " + o1.getItem_id() + "Item 2 " + o2.getItem_id());
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			System.out.println("Item 1 " + o1.getItem_id() + "Product Group " + o1.getProductGroup());
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		    System.out.println("Item 2 " + o2.getItem_id() + "Product Group " + o2.getProductGroup());
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			if (o1.getProductGroup().compareTo(o2.getProductGroup()) > 0) {
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			if (o1.getProductGroup().compareTo(o2.getProductGroup()) > 0) {
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				return -1;
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				return -1;
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			} else if (o1.getProductGroup().compareTo(o2.getProductGroup()) < 0) {
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			} else if (o1.getProductGroup().compareTo(o2.getProductGroup()) < 0) {
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				return 1;
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				return 1;
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			}
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			}