Java

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List<OrderedPair> list1 = new ArrayList<OrderedPair>() ;
				
		OrderedPair e0  = new OrderedPair(); e0.index=0; e0.value=1;
		OrderedPair e1  = new OrderedPair(); e1.index=2; e1.value=2;
		OrderedPair e2  = new OrderedPair(); e2.index=3; e2.value=3;
		
		ListIterator<OrderedPair> iterator = list1.listIterator();
		iterator.add(e0);
		iterator.add(e1);
		iterator.add(e2);
		
		OrderedPair op1 = (OrderedPair) iterator.previous();
		System.out.print("index = "); System.out.print(op1.index);
		System.out.print(", value = "); System.out.print(op1.value);
		System.out.println();		
		
		OrderedPair op2 = (OrderedPair) iterator.previous();
		System.out.print("index = "); System.out.print(op2.index);
		System.out.print(", value = "); System.out.print(op2.value);
		System.out.println();	
		
		OrderedPair op3 = (OrderedPair) iterator.previous();
		System.out.print("index = "); System.out.print(op3.index);
		System.out.print(", value = "); System.out.print(op3.value);
		System.out.println();