Java 程序检查给定值是否存在于 HashMap 中
使用 containsValue() 方法检查给定值是否存在于 HashMap 中。
首先,让我们创建一个 HashMap 并添加一些元素——
HashMap hm = new HashMap();
// Put elements to the map
hm.put("Bag", new Integer(1100));
hm.put("Sunglasses", new Integer(2000));
hm.put("Frames", new Integer(800));
hm.put("Wallet", new Integer(700));
hm.put("Belt", new Integer(600));现在让我们检查给定的值是否存在。在此,我们检查值“800”——
hm.containsValue(800);
以下示例检查给定值是否存在于 HashMap 中——
示例
import java.util.*;
public class Demo {
public static void main(String args[]) {
// Create a hash map
HashMap hm = new HashMap();
// Put elements to the map
hm.put("Bag", new Integer(1100));
hm.put("Sunglasses", new Integer(2000));
hm.put("Frames", new Integer(800));
hm.put("Wallet", new Integer(700));
hm.put("Belt", new Integer(600));
// Get a set of the entries
Set set = hm.entrySet();
System.out.println("Elements in HashMap...");
// Get an iterator
Iterator i = set.iterator();
// Display elements
while(i.hasNext()) {
Map.Entry me = (Map.Entry)i.next();
System.out.print(me.getKey() + ": ");
System.out.println(me.getValue());
}
System.out.println();
System.out.println("Does key Bag exist in the HashMap = "+hm.containsKey("Bag"));
System.out.println("Does value 800 exist in the HashMap = "+hm.containsValue(800));
}
}输出
Elements in HashMap... Frames: 800 Belt: 600 Wallet: 700 Bag: 1100 Sunglasses: 2000 Does key Bag exist in the HashMap = true Does value 800 exist in the HashMap = true
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