该错误can only iterate over an array or an instance of java.lang.iterable的实例并不意味着它会阻止用户在数组或实例上使用循环。 这意味着使用的循环不能补充其条件 - 例如 for 或 foreach 循环。 使用Iterator() 解决 Can Only Iterate Over an Array or an Instance of java.lang.iterable 错误 在循环...
publicvoiditerateUsingIteratorAndEntry(Map<String, Integer> map){ Iterator<Map.Entry<String, Integer>> iterator = map.entrySet().iterator();while(iterator.hasNext()) { Map.Entry<String, Integer> entry = iterator.next(); System.out.println(entry.getKey() +":"+ entry.getValue()); } } N...
for(Stringtemp : crunchifyList){ System.out.println(temp); } // Iterator - Returns an iterator over the elements in this list in proper sequence. System.out.println("\n===> 3. Iterator Example..."); Iterator<String>crunchifyIterator = crunchifyList.iterator(); while(crunchifyIterator.h...
There are several ways to iterate over the entries in a Map in Java. Here are some options:For-each loop: You can use a for-each loop to iterate over the entrySet of the Map. This is the most concise option:Map<String, Integer> map = new HashMap<>(); // add some entries to ...
import java.util.Map; import java.util.Random; import java.util.TreeMap; import java.util.stream.Collectors; import java.util.stream.IntStream;public class Main { private static final String chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";public static String generateRandomWord(int len) { return IntStream...
We will copy all the array elements from carBrands to another array using the forEach method. Let’s declare an empty array called copyOfCarBrands.let copyOfCarBrands: string[] = []; Let’s use the forEach method to iterate over each element in the carBrands array and push it to ...
*/publicclassListIterateProgram{publicstaticvoidmain(String... args){ List<String> colors = Arrays.asList("red","orange","yellow","green","blue","indigo","violet");// Basic loopfor(inti =0; i < colors.size(); i++){ String color = colors.get(i); ...
importcom.google.common.collect.Iterables; importjava.util.LinkedList; importjava.util.Arrays; importjava.util.Queue; classMain { // Iterate over a queue in Java publicstaticvoidmain(String[]args) { Queue<Integer>q=newLinkedList<>(); q.add(1); q.add(2); q.add(3...
The values() method returns an array containing the constants of the enum type, in the order, they're declared. Iterate over enum values using forEach() The forEach() method was introduced in Java 8 as part of the Iterable interface. So all the Java collection classes (List, Set, etc...
val inputLength: Iteratee[Array[Byte],Int] = { Iteratee.fold[Array[Byte],Int](0) { (length, bytes) => length + bytes.size } } Another would be consuming all input and eventually returning it: val consume: Iteratee[String,String] = { Iteratee.fold[String,String]("") { (result, chu...