我们可以通过该方法来遍历哈希映射中所有的键,如下所示: importjava.util.HashMap;importjava.util.Set;publicclassHashMapDemo{publicstaticvoidmain(String[]args){// 创建哈希映射对象HashMap<String,String>hashMap=newHashMap<>();// 添加元素hashMap.put("A","Apple");hashMap.put("B","Banana");ha...
keySet()); Java Copy在这里,我们首先使用SortedMap的firstKey()和lastKey()方法获取了SortedMap对象中的第一个键和最后一个键,然后使用subMap(fromKey, toKey)方法获取了这两个键之间的所有键值对,并将其赋值给sortedMap变量。最后,我们调用keySet()方法获取了sortedMap中所有键的集合,并使用println()方法输出。
2.2 测试场景 分别使用keySet、entrySet和values的多种写法测试三种场景:遍历key+value、遍历key、遍历value的场景。 遍历key+value keySet遍历key+value(写法1): Iterator<String> iter =map.keySet().iterator();while(iter.hasNext()) { key=iter.next(); value=map.get(key); } keySet遍历key+value(写法2...
示例1:将字符串值映射到整数键。 // Java code to illustrate the keys() methodimportjava.util.*;importjava.util.concurrent.*;publicclassConcurrentHashMapDemo{publicstaticvoidmain(String[] args){// Creating an empty ConcurrentHashMapConcurrentHashMap<Integer, String> hash_map =newConcurrentHashMap<In...
@NonNlsStringbaseName,Function<String,T>integerResolver){ CollatorcaseInsensitive=Collator.getInstance(locale); caseInsensitive.setStrength(Collator.PRIMARY); ImmutableSortedMap.Builder<String,T>nameToModeBuilder =newImmutableSortedMap.Builder<String,T>(caseInsensitive); ...
import java.util.Iterator; import java.util.Map; import java.util.stream.Stream; class Main { // Programm zum Iterieren der Karte mit `keySet()` in Java public static void main(String[] args) { Map<Integer, String> map = new HashMap<>(); map.put(1, "One"); map.put(2, "Two...
Source File: FunctionController.java From spring-cloud-function with Apache License 2.0 5 votes private MultiValueMap<String, String> multi(MultiValueMap<String, Part> body) { MultiValueMap<String, String> map = new LinkedMultiValueMap<>(); for (String key : body.keySet()) { for (Part part ...
https://stackoverflow.com/questions/8962459/java-collections-keyset-vs-entryset-in-map http://blog.csdn.net/lwzcjd/article/details/5432430 http://blog.csdn.net/nuoshueihe/article/details/7874069 http://www.cnblogs.com/mimimimimi/p/4094265.html ...
Returns an array containing all of the elements in this collection; the runtime type of the returned array is that of the specified array. StringtoString() Returns a string representation of this collection. Methods declared in class java.lang.Object clone, equals, finalize, getClass, hashC...
https://stackoverflow.com/questions/8962459/java-collections-keyset-vs-entryset-in-map http://blog.csdn.net/lwzcjd/article/details/5432430 http://blog.csdn.net/nuoshueihe/article/details/7874069 http://www.cnblogs.com/mimimimimi/p/4094265.html ...