import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* Description:Map遍历的map.keyset和map.entryset
* @author 李XX2019年9月19日
*/
public class Map遍历
{
public static void main(String[] args)
{
Map<String,String> map =
new HashMap<String,String>
();
map.put("1", "value1"
);
map.put("2", "value2"
);
map.put("3", "value3"
);
map.put("4", "value4"
);
map.put("5", "value5"
);
System.out.println("通过map.keySet遍历key和value："
);
for(String key:map.keySet())
{
System.out.println("Key:"+key+" Value:"+
map.get(key));
}
System.out.println("\n通过map.entrySet遍历key和value："
);
for(Map.Entry<String, String>
entry:map.entrySet())
{
System.out.println("Key:"+entry.getKey()+" Value:"+
entry.getValue());
}
System.out.println("\n通过map.entrySet使用Iteration遍历key和value"
);
Iterator<Map.Entry<String, String>> it=
map.entrySet().iterator();
while(it.hasNext())
{
Map.Entry<String, String> entry=
it.next();
System.out.println("Key:"+entry.getKey()+" Value:"+
entry.getValue());
}
System.out.println("\n通过map.keySet使用Iteration遍历key和value"
);
Iterator<String> ite =
map.keySet().iterator();
while(ite.hasNext())
{
String key =
ite.next();
System.out.println("Key:"+key+" Value:"+
map.get(key));
}
System.out.println("\n通过增强型for循环只遍历键或值"
);
for(String s1:map.keySet())
{
System.out.println("Key:"+
s1);
}
for(String s2:map.values())
{
System.out.println("Value:"+
s2);
}
}
}
转载于:https://www.cnblogs.com/lhh666/p/11546360.html
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