Set<BufferedImage> set = map.keySet();
Iterator<BufferedImage> iterator = set.iterator();
while(iterator.hasNext()) {
    BufferedImage image = iterator.next();
}

------解决方案--------------------
探讨

Java code
Set<BufferedImage> set= map.keySet();
Iterator<BufferedImage> iterator= set.iterator();while(iterator.hasNext()) {
    BufferedImage image= iterator.next();
}


------解决方案--------------------
map.keySet(); 是取出所有的key。

------解决方案--------------------
探讨

Java code
Set<BufferedImage> set= map.keySet();
Iterator<BufferedImage> iterator= set.iterator();while(iterator.hasNext()) {
    BufferedImage image= iterator.next();
}