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The Java Developers Almanac 1.4Order this book from Amazon. |
e356. Creating a Map That Retains Order-of-InsertionMap map = new LinkedHashMap(); // Add some elements map.put("1", "value1"); map.put("2", "value2"); map.put("3", "value3"); map.put("2", "value4"); // List the entries for (Iterator it=map.keySet().iterator(); it.hasNext(); ) { Object key = it.next(); Object value = map.get(key); } // [1=value1, 2=value4, 3=value3]
e357. Automatically Removing an Unreferenced Element from a Hash Table
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