5
我需要迭代通过一个有5000个项目的哈希映射,但在第500个项目迭代后,我需要做一个睡眠,然后继续下一个500项目。这里是从here盗取的例子。任何帮助将不胜感激。迭代通过哈希映射'块'
import java.util.HashMap;
import java.util.Map;
public class HashMapExample {
public static void main(String[] args) {
Map vehicles = new HashMap();
// Add some vehicles.
vehicles.put("BMW", 5);
vehicles.put("Mercedes", 3);
vehicles.put("Audi", 4);
vehicles.put("Ford", 10);
// add total of 5000 vehicles
System.out.println("Total vehicles: " + vehicles.size());
// Iterate over all vehicles, using the keySet method.
// here are would like to do a sleep iterating through 500 keys
for(String key: vehicles.keySet())
System.out.println(key + " - " + vehicles.get(key));
System.out.println();
String searchKey = "Audi";
if(vehicles.containsKey(searchKey))
System.out.println("Found total " + vehicles.get(searchKey) + " "
+ searchKey + " cars!\n");
// Clear all values.
vehicles.clear();
// Equals to zero.
System.out.println("After clear operation, size: " + vehicles.size());
}
}
这个问题比以前要干净得多。 +1 – byxor
@BrandonIbbotson谢谢我正要删除旧的,但有人发了一个答案,我无法删除它了。 – PHA
@PHA你总是可以鼓励回答者在这里重新发布他的答案,以允许你删除这个问题。 –