importjava.util.ArrayList;importjava.util.List;publicclassListForeachExample{publicstaticvoidmain(String[]args){// 创建一个ArrayList并插入数据List<String>fruits=newArrayList<>();fruits.add("Apple");fruits.add("Banana");fruits.add("Cherry");fruits.add(1,"Orange");// 在索引1插入“Orange”// ...
二、使用 forEach 遍历 List C以forEach方法遍历List是一种优雅的方式。例如,使用Lambda表达式: AI检测代码解析 importjava.util.Arrays;importjava.util.List;publicclassForEachExample{publicstaticvoidmain(String[]args){List<String>fruits=Arrays.asList("Apple","Banana","Cherry","Date");fruits.forEach(fr...
publicclassListSortExample2{publicstaticvoidmain(String[]args){// 创建并初始化 ListList<Person>list=newArrayList<Person>(){{add(newPerson(1,30,"北京"));add(newPerson(2,20,"西安"));add(newPerson(3,40,"上海"));}};// 使用匿名比较器排序Collections.sort(list,newComparator<Person>(){@Over...
public class ForeachStringArrayExample { public static void main(String[] args) { String[] fruits = {"Apple", "Banana", "Cherry"}; for (String fruit : fruits) { System.out.println(fruit); } } } 输出: Apple Banana Cherry 使用foreach循环遍历集合 Java中的集合类(如List, Set等)也支...
除了数组，你还可以在集合框架中使用foreach循环来遍历列表、集合、映射等等。这使得处理数据集合变得非常方便。1）遍历列表（List）：代码示例 import java.util.ArrayList;import java.util.List;publicclassMain { publicstaticvoidmain(String[] args) { List<String> names = newArrayList<>();names.add("Miao...
For example, the following code iterates a list and prints the lowercase strings using theforEach()API. Consumer<String>action=x->System.out.println(x.toLowerCase());list.forEach(action); 2.3. Lambda Expressions We can pass the simple lambda expression inline, as well. ...
import java.util.Arrays; import java.util.List; public class ForEachExample { public static void main(String[] args) { List<String> names = Arrays.asList("Alice", "Bob", "Charlie"); // 使用lambda表达式遍历集合 names.forEach(name -> System.out.println(name)); // 使用方法引用遍历集合...
packagecom.example.learncollection;importjava.util.List;publicclassUseListAppMain{publicstaticvoidmain(String[] args){ListmyList=newMyArrayList();for(inti=0; i <10; i++) { myList.add("str"+ (i %5)); } System.out.println();
(1)foreach循环遍历 (2)Iterator迭代器遍历 4、HashMap遍历方式 (1)entrySet遍历 (2)Iterator迭代器遍历 5、LinkedHashMap遍历方式 (1)entrySet遍历 (2)Iterator迭代器遍历 三、性能比较一、简介List、Set 都继承 Collection 接口,Map 不是。 List:元素有序存储,元素可重复,取出来的顺序可能和放入的顺序不同,支...
.forEach(System.out::println); } In this example, we begin with a list of fruit names. Using a stream, we chain three operations: first, themapmethod transforms each string to uppercase with a method reference (String::toUpperCase); next, thefiltermethod selects only those strings exceedin...