HashMap+put(key, value)+remove(key)+get(key)RemoveMultipleKeys+main(args) : void+removeKeys(map: HashMap, keys: List) : void 在类图中,我们显示了 HashMap 的主要方法以及 RemoveMultipleKeys 类中用于移除多个键的方法。 结论 本文介绍了如何在 J
remove() 方法带有 key 和 value 两个参数:实例 import java.util.HashMap; class Main { public static void main(String[] args) { HashMap<Integer, String> sites = new HashMap<>(); sites.put(1, "Google"); sites.put(2, "Runoob"); sites.put(3, "Taobao"); System.out.println("HashMa...
importjava.util.HashMap;importjava.util.Map;publicclassContainsKeyExample{publicstaticvoidmain(String[]args){Map<String,Integer>map=newHashMap<>();map.put("apple",1);map.put("banana",2);map.put("orange",3);// 检查 map 中是否存在某个键StringkeyToCheck="banana";if(map.containsKey(keyToC...
HashMap 中删除一个元素的过程,如下图所示: 根据对冲突的处理方式不同,哈希表有两种实现方式,一种开放地址方式(Open addressing),另一种是冲突链表方式(Separate chaining with linked lists)。JavaHashMap采用的是冲突链表方式。
keySet.remove(key); System.out.println("The key " + + key + " was deleted"); } } 1 2 3 4 5 6 To delete key 0 The key 0 was deleted Exception in thread "main" java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793) at java.util....
Example 1: HashMap remove() With Key Parameter importjava.util.HashMap;classMain{publicstaticvoidmain(String[] args){// create a HashMapHashMap<Integer, String> languages =newHashMap<>();// add mappings to HashMaplanguages.put(1,"Python"); ...
HashMap.remove(...) return removeNullKey(); origin: com.bugvm/bugvm-rt HashMap.remove(...) return removeNullKey(); origin: com.gluonhq/robovm-rt HashMap.remove(...) return removeNullKey(); origin: com.jtransc/jtransc-rt HashMap.remove(...) return removeNullKey(); origin...
import java.util.HashMap; public class Main { public static void main(String[] args) { HashMap<String, String> capitalCities = new HashMap<String, String>(); capitalCities.put("England", "London"); capitalCities.put("Germany", "Berlin"); capitalCities.put("Norway", "Oslo"); capital...
1.如下的方式删除键值对不会抛出异常 2.否则直接通过finalResult.remove(key)修改hashmap时会在remove()执行之后抛出异常
key，返回指定键 key 关联的值，如果指定的 key 映射值为 null 或者该 key 并不存在于该 HashMap ...