java treemap的遍历

Java TreeMap是一种基于红黑树实现的有序映射，它提供了多种遍历方式，包括：
1. 遍历键

TreeMap<Integer, String> treeMap = new TreeMap<>();
treeMap.put(1, "one");
treeMap.put(2, "two");
treeMap.put(3, "three");
for (Integer key : treeMap.keySet()) {
    System.out.println(key);
}

2. 遍历值

for (String value : treeMap.values()) {
    System.out.println(value);
}

3. 遍历键值对

for (Map.Entry<Integer, String> entry : treeMap.entrySet()) {
    System.out.println(entry.getKey() + ":" + entry.getValue());
}

4. 使用迭代器遍历

Iterator<Map.Entry<Integer, String>> iterator = treeMap.entrySet().iterator();
while (iterator.hasNext()) {
    Map.Entry<Integer, String> entry = iterator.next();
    System.out.println(entry.getKey() + ":" + entry.getValue());
}