本教程将为你展示Java中HashMap的几种典型遍历方式。 如果你使用Java8,由于该版本JDK支持lambda表达式,可以采用第5种方式来遍历。 如果你想使用泛型,可以参考方法3。如果你使用旧版JDK不支持泛型可以参考方法4。 1、 通过ForEach循环进行遍历 代码语言:javascript 代码运行次数:0 运行 AI代码解释 mport java.io.IOEx...
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...
// 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...
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:...
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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(...
util.Map; import java.util.Map.Entry; /** * 练习循环map集合中key和value的方法 * @author aflyun * * */ public class TestMap { public static void main(String[] args) { Map<Object , Object> map = new HashMap<Object, Object>(); for (int i = 0; i < 10; i++) { map.put(...
HashMap : +put(key, value) HashMap : +values() Collections : +sort(list) ArrayList : +ArrayList() List : +for-each loop 旅行图 journey title Java HashMap value排序实现 section 初始化HashMap 初始化HashMap section 向HashMap中添加键值对 ...
To learn more about lambda expression, visit Java Lambda Expressions. Note: The forEach() method is not the same as the for-each loop. We can use the Java for-each loop to loop through each entry of the hashmap. Also Read: Java ArrayList forEach() Previous...
Loop Through a HashMap Loop through the items of aHashMapwith afor-eachloop. Note:Use thekeySet()method if you only want the keys, and use thevalues()method if you only want the values: Example // Print keysfor(Stringi:capitalCities.keySet()){System.out.println(i);} ...