1、 通过ForEach循环进行遍历 代码语言:javascript 复制 mport java.io.IOException;importjava.util.HashMap;importjava.util.Map;publicclassTest{publicstaticvoidmain(String[]args)throws IOException{Map map=newHashMap();map.put(1,10);map.put(2,20);// Iterating entries using a For Each loopfor(Map...
mport java.io.IOException;importjava.util.HashMap;importjava.util.Map;publicclassTest{publicstaticvoidmain(String[] args)throwsIOException { Map<Integer, Integer> map =newHashMap<Integer, Integer>(); map.put(1,10); map.put(2,20);// Iterating entries using a For Each loopfor(Map.Entry<I...
Loop through the items of a HashMap with a for-each loop.Note: Use the keySet() method if you only want the keys, and use the values() method if you only want the values:ExampleGet your own Java Server // Print keys for (String i : capitalCities.keySet()) { System.out.println(...
packagecom.programiz.hashmap;importjava.util.HashMap;publicclassCreateHashMap{publicstaticvoidmain(String[] args){// Creating a hashmap of even numbersHashMap<String, Integer> evenNumbers =newHashMap<>(); evenNumbers.put("Two",2); evenNumbers.put("Four",4); System.out.println("HashMap1:...
Java 8 中的 Map 循环 在Java 8 中,我们可以使用forEach方法遍历 Map 中的元素。这种方式优雅简洁,代码量相对较少,使用起来非常方便。 importjava.util.HashMap;importjava.util.Map;publicclassMapLoopExample{publicstaticvoidmain(String[]args){Map<Integer,String>map=newHashMap<>();map.put(1,"Apple");...
sites HashMap: {1=Google, 2=Runoob, 3=Taobao} Keys: [1, 2, 3]keySet() 方法可以与 for-each 循环一起使用,用来遍历迭代 HashMap 中的所有键。实例 import java.util.HashMap; class Main { public static void main(String[] args) { // 创建一个 HashMap HashMap<Integer, String> sites = ...
Since Java 9, we have factory methods for HashMap initialization. Main.javaimport java.util.Map; import static java.util.Map.entry; void main() { Map colours = Map.of(1, "red", 2, "blue", 3, "brown"); System.out.println(colours); Map countries = Map.ofEntries( entry("de", "...
// for-each loop 在该视图中访问了每一映射项 for(Entry<String, Integer> entry: numbers.entrySet()) { System.out.print(entry); System.out.print(", "); } } }执行以上程序输出结果为:HashMap: {One=1, Two=2, Three=3} Entries: One=1, Two=2, Three=3, Java...
本文是关于 -Java Lambda Expression在forEach方法的应用讨论。对比其他编程语言的foreach 操作(文末附带7种主要编程语言的Loop HashMap by forEach的程序片段),Java 8引入的运用 Lambda Expression方式的 forEach操作方法是最接近语言所要表达的本意,且简洁、直接。
To iterate over a java.util.Map with a for loop, we first get the map’s set of keys and then convert that java.util.Set to a String array. 12345678910111213 Map <String,String>myMap = new HashMap<String,String>(); myMap.put("a", "alpha"); myMap.put("b", "beta"); myMap...