java HashMap

java Hashtable

在这里插入代码片
package first;
import java.util.*;


public class TestMap {

	public static void main( String[] args) {
		// TODO Auto-generated method stub
		Map<String, String> map = new HashMap<String,String>();
		map.put("1", "value1");
		map.put("22", "value2");
		map.put("3", "value3");
		
		for( String key : map.keySet())
			System.out.println( key + "  " + map.get(key));
		
		Iterator<Map.Entry<String, String>> it = map.entrySet().iterator();
		while (it.hasNext()) {
			Map.Entry<String, String> entry = it.next();
			System.out.println(entry.getKey()+ "  " + entry.getValue());
		}
		
		for (Map.Entry<String, String> entry : map.entrySet()) {
			System.out.println(entry.getKey() + " " + entry.getValue());
		}
		
		for ( String v : map.values() ) {
			System.out.print(v);
		}
		

	}

}