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koher/TreeMapGetGetsException.java

Created September 29, 2015 22:50
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TreeMap#get gets ClassCastException
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TreeMapGetGetsException.java
import java.util.*;
Map<String, Integer> map = new TreeMap();
map.put("abc", 123);
map.put("def", 456);
map.put("ghi", 789);
map.get("abc");
map.get(123); // java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer
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