您能解释一下这段代码吗?
TreeMap<String, Integer> myMap = new TreeMap<String, Integer>();
myMap.put("a", 50);
myMap.put("b", 60);
myMap.put("c", 70);
NavigableMap<String, Integer> myMap2 = myMap.headMap("d", true);
myMap.put("e", 90);
myMap2.put("f", 100);//exception here
System.out.println(myMap.size() + " " + myMap2.size());
输出消息:
java.lang.IllegalArgumentException: key out of range
at java.util.TreeMap$NavigableSubMap.put(TreeMap.java:1407)
at SomeClass.main(SomeClass.java:13)
我不明白为什么我有它。
最佳答案
来自JavaDoc on TreeMap.headMap
:
The returned map will throw an
IllegalArgumentException
on an attempt to insert a key outside its range.
关于java - NavigableMap : java. lang.IllegalArgumentException:键超出范围,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21498112/