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| 1 | +package challenge61_70; |
| 2 | + |
| 3 | +import java.util.HashMap; |
| 4 | +import java.util.Map; |
| 5 | + |
| 6 | +/** |
| 7 | + * HashMap's hashcode implementation |
| 8 | + * HashMap's put operation. |
| 9 | + */ |
| 10 | +public class Challenge_61 { |
| 11 | + public static void main( String[] args ) { |
| 12 | + Map<Map<Object, String>, String> mainMap = new HashMap<>(); |
| 13 | + |
| 14 | + Map<Object, String> subMap1 = new HashMap<>(); |
| 15 | + subMap1.put(1, "A"); |
| 16 | + |
| 17 | + Map<Object, String> subMap2 = new HashMap<>(); |
| 18 | + subMap2.put(1, "A"); |
| 19 | + |
| 20 | + Map<Object, String> subMap3 = new HashMap<>(); |
| 21 | + subMap3.put(65, "01円"); |
| 22 | + |
| 23 | + System.out.println("subMap1.hashCode() = " + subMap1.hashCode()); |
| 24 | + System.out.println("subMap3.hashCode() = " + subMap3.hashCode()); |
| 25 | + mainMap.put(subMap1, "crazyMap1"); |
| 26 | + mainMap.put(subMap2, "crazyMap2"); |
| 27 | + mainMap.put(subMap3, "crazyMap3"); |
| 28 | + |
| 29 | + System.out.println(mainMap.size()); |
| 30 | + System.out.println("mainMap.entrySet().size() = " + mainMap.entrySet().size()); |
| 31 | + |
| 32 | + } |
| 33 | +} |
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