遍历Map

import java.util.Calendar;
import java.util.HashMap;
import java.util.Iterator;

public class HashMapTest {

public static void main(String[] args) {
HashMap<Integer,String> hashmap = new HashMap<Integer,String>();
for (int i = 0; i < 10; i++) {
hashmap.put(i, "thanks");
}
System.out.println("HashMap 中 value set 完毕 .......");

long bs = Calendar.getInstance().getTimeInMillis();
Iterator iterator = hashmap.keySet().iterator();
while (iterator.hasNext()) {
System.out.print(hashmap.get(iterator.next()));
}
System.out.println();
System.out.println("遍历HashMap完毕.....");

System.out.print("历时 ：") ;
System.out.println(Calendar.getInstance().getTimeInMillis() - bs);
listHashMap();
}

public static void listHashMap() {
java.util.HashMap<Integer,String> hashmap = new java.util.HashMap<Integer,String>();
for (int i = 0; i < 10; i++) {
hashmap.put(i, "thanks");
}
long bs = Calendar.getInstance().getTimeInMillis();
Iterator it = hashmap.entrySet().iterator();
while (it.hasNext()) {
java.util.Map.Entry entry = (java.util.Map.Entry) it.next();
// entry.getKey() 返回与此项对应的键
// entry.getValue() 返回与此项对应的值
System.out.print(entry.getKey()+" : ");
System.out.print(entry.getValue()+" , ");
}
System.out.println();
System.out.print("历时：");
System.out.println(Calendar.getInstance().getTimeInMillis() - bs);
}
}