方式一:使用entrySet()与forEach循环
for (Map.Entry<String, Integer> entry : map.entrySet()) {
System.out.println("Key: " + entry.getKey() + ", Value: " + entry.getValue());
}
方式二:使用keySet()与forEach循环
for (String key : map.keySet()) {
System.out.println("Key: " + key + ", Value: " + map.get(key));
}
方式三:使用forEach与Lambda循环
map.forEach((key, value) ->
System.out.println("Key: " + key + ", Value: " + value)
);
方式四:使用迭代器与entrySet()或keySet()
Iterator<Map.Entry<String, Integer>> iterator = map.entrySet().iterator();
while (iterator.hasNext()) {
Map.Entry<String, Integer> entry = iterator.next();
System.out.println("Key: " + entry.getKey() + ", Value: " + entry.getValue());
}
Iterator<String> keyIterator = map.keySet().iterator();
while (keyIterator.hasNext()) {
String key = keyIterator.next();
System.out.println("Key: " + key + ", Value: " + map.get(key));
}
方式五:使用Stream()流Api
map.entrySet().stream()
.forEach(entry ->
System.out.println("Key: " + entry.getKey() + ", Value: " + entry.getValue())
);
// 或者并行流(大数据量时可能提升性能)
map.entrySet().parallelStream()
.forEach(entry ->
System.out.println("[Parallel] Key: " + entry.getKey() + ", Value: " + entry.getValue())
);