遍歷循環輸出map的幾種方式

package 常用的遍歷方法.forTest;

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

public class CircleTest {
	public static void main(String[] args) {
		Map<String,Object> map = new HashMap<String,Object>();
		map.put("accident", "意外險");
		map.put("properties", "財產險");
		map.put("biz", "商業險");
		map.put("force", "交強險");
		
		//1、迭代器
		Iterator<Map.Entry<String, Object>> iter = map.entrySet().iterator();
		//判斷往下還有沒有數據
		while(iter.hasNext()){
			//有的話取出下面的數據
			Entry<String, Object> entry = iter.next();
			String key = entry.getKey();
			String value = (String)entry.getValue();
			if("biz".equals(entry.getKey())){
				System.out.println("這個是商業險");
			}
			System.out.println(key + " ：" + value);
		}
		
		//2、foreach循環
		//獲取key + value
		for (Object key : map.keySet()) {
			String value = (String)map.get(key);
			System.out.println(key + " : " + value);
		}
		//獲取value
		for (Object value : map.values()) {
			System.out.println(value);
		}
		
		//3、當容量特別大的時候
		for (Entry<String, Object> entry : map.entrySet()) {
			/*iter :  biz=商業險
					force=交強險
					accident=意外險
					properties=財產險*/
			 System.out.println(entry.getKey() + " : " + entry.getValue());
		}
	}
}