import java.util.Map;
import java.util.Map.Entry;
import java.util.HashMap;
import java.util.Set;
import java.util.Iterator;
import java.util.ArrayList;
import java.util.LinkedList;
class Demo16{
public static void main(String[] args){
Map<String,String> map = new HashMap<>();
map.put("name","--哥");
map.put("age","30");
map.put("sex","男");
Set<Entry<String,String>> entrySet = map.entrySet();
Iterator<Map.Entry<String,String>> iterator = entrySet.iterator();
while (iterator.hasNext()){
Map.Entry<String,String> entry = iterator.next();
String key = entry.getKey();
String value = entry.getValue();
System.out.println(key + "=" + value);
}
for(Map.Entry<String,String> entry : map.entrySet()){
String key = entry.getKey();
String value = entry.getValue();
System.out.println(key + "=" + value);
}
}
public static void addArrayList(){
long start = System.currentTimeMillis();
ArrayList<Integer> arrayList = new ArrayList<>();
for (int i = 1; i <= 10000000 ; i++) {
arrayList.add(i);
}
long end = System.currentTimeMillis();
System.out.println("耗时:" + (end - start));
}
public static void addLinkedList(){
long start = System.currentTimeMillis();
LinkedList<Integer> linkedList = new LinkedList<>();
for (int i = 1; i <= 10000000 ; i++) {
linkedList.add(i);
}
long end = System.currentTimeMillis();
System.out.println("耗时:" + (end - start));
}
}