如何在HashMap
中搜索 key ?在此程序中,当用户输入键时,代码应安排在哈希图中搜索相应的值,然后将其打印出来。
请告诉我为什么它不起作用。
import java.util.HashMap;
import java.util.; import java.lang.;
public class Hashmapdemo
{
public static void main(String args[])
{
String value;
HashMap hashMap = new HashMap();
hashMap.put( new Integer(1),"January" );
hashMap.put( new Integer(2) ,"February" );
hashMap.put( new Integer(3) ,"March" );
hashMap.put( new Integer(4) ,"April" );
hashMap.put( new Integer(5) ,"May" );
hashMap.put( new Integer(6) ,"June" );
hashMap.put( new Integer(7) ,"July" );
hashMap.put( new Integer(8),"August" );
hashMap.put( new Integer(9) ,"September");
hashMap.put( new Integer(10),"October" );
hashMap.put( new Integer(11),"November" );
hashMap.put( new Integer(12),"December" );
Scanner scan = new Scanner(System.in);
System.out.println("Enter an integer :");
int x = scan.nextInt();
value = hashMap.get("x");
System.out.println("Value is:" + value);
}
}
最佳答案
只需调用 get
:
HashMap<String, String> map = new HashMap<String, String>();
map.put("x", "y");
String value = map.get("x"); // value = "y"
关于java - 在HashMap中搜索给定键的值,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/3051486/