java的HashMap遍历输出

package hashmap_1;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		// HashMap hashMap = new
		// HashMap();///Syntax error on token "double",
		// Dimensions expected after this token
		HashMap hashMap = new HashMap();
		hashMap.put("aa", 90.0);
		hashMap.put("bb", 80.0);
		hashMap.put("cc", 70.0);
		Iterator iter = hashMap.entrySet().iterator();
		while (iter.hasNext()) {
			Map.Entry entry = (Map.Entry) iter.next();
			Object key = entry.getKey();
			Object value = entry.getValue();
			System.out.println(key + ":" + value);

		}

	}

}

aa:90.0
bb:80.0
cc:70.0

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