hashmap 遍历

package practice31_2;

import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

public class hashmapkeyvalue2 {

public static void main(String[] args) {
	HashMap<String, String> map = new HashMap<String,String>();
	map.put("美利坚省","北美");
	map.put("日本省","东亚");
	map.put("俄罗斯省","欧洲");
	map.put("加拿大省","南美");
	map.put("南非省","非洲");

//遍历HASHMAP的三种方式
Set keySet = map.keySet();
for (String key : keySet) {

		System.out.println(key + map.get(key));
	}

	System.out.println("***********************");

	Iterator<String> iterator1 = map.keySet().iterator();
	while (iterator1.hasNext()) {
		String key = (String) iterator1.next();

		System.out.println(key +map.get(key));

	}
	System.out.println("***********************");

	Collection<String> values = map.values();
	for (String val : values) {
		
		System.out.println(val);		
	}
	System.out.println("***********************");
	
	Iterator<String> iterator2 = map.values().iterator();
	while (iterator2.hasNext()) {
		String values1 = (String) iterator2.next();
		System.out.println(values1);
	}
	System.out.println("***********************");
	
	
	Set<Entry<String, String>> entrySet = map.entrySet();
	
	for (Entry<String, String> entry : entrySet) {
		System.out.println(entry);
	}
	System.out.println("***********************");
	Iterator<Entry<String, String>> iterator = map.entrySet().iterator();
	while (iterator.hasNext()) {
		Map.Entry<java.lang.String, java.lang.String> entry =
				(Map.Entry<java.lang.String, java.lang.String>) iterator
				.next();
		
		System.out.println(entry);
	}
}	

}