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Horizontal and vertical timeline functionality in java

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Is there a way or methodology in Java to execute certain set horizontally and execute a process as a vertical time line and then again continue execution horizontally? For example: this is my map

map with {String, list of objects}
map.put("1", {obj1, obj2, obj3})
map.put("2", {obj})
map.put("3", {obj})
so now i need start creating xmls for the above list. obj1,obj2 should be executed then, halt execute obj of 2nd key and then continue obj3 and then the elements from key 3.
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Yes. You could program the app to do exactly what you said. In fact you can maintain a reference to an Iterator in the first List so you can go back and take off where you left off.
But first explain more. Are you processing all the objects in that particular order? Would the order change depending on the attributes of any of the values? How would you iterate the set of keys? Would you put the keys into a sorted set and iterate that?
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