package 常用的遍历方法.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", "意外险");
map.put("properties", "财产险");
map.put("biz", "商业险");
map.put("force", "交强险");
//1、迭代器
Iterator<Map.Entry<String, Object>> iter = map.entrySet().iterator();
//判断往下还有没有数据
while(iter.hasNext()){
//有的话取出下面的数据
Entry<String, Object> entry = iter.next();
String key = entry.getKey();
String value = (String)entry.getValue();
if("biz".equals(entry.getKey())){
System.out.println("这个是商业险");
}
System.out.println(key + " :" + value);
}
//2、foreach循环
//获取key + value
for (Object key : map.keySet()) {
String value = (String)map.get(key);
System.out.println(key + " : " + value);
}
//获取value
for (Object value : map.values()) {
System.out.println(value);
}
//3、当容量特别大的时候
for (Entry<String, Object> entry : map.entrySet()) {
/*iter : biz=商业险
force=交强险
accident=意外险
properties=财产险*/
System.out.println(entry.getKey() + " : " + entry.getValue());
}
}
}
来源:oschina
链接:https://my.oschina.net/u/4385636/blog/4052391