for(Integerj:list){ // use j } (2) 显示调用集合迭代器 Java List<Integer> list = new ArrayList<Integer>(); for (Iterator<Integer> iterator = list.iterator(); iterator.hasNext();) { iterator.next(); } 1 2 3 4 List<Integer>list=newArrayList<Integer>(); for(Iterator<Integer>iterator...
This class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a “random access” data store (such as an array). For sequential access data (such as a linked list), AbstractSequentialList should be used in preference to...
即:对增强for的目标先进行不为null的判断,然后再使用。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 1 package cn.itcast_01; 2 3 import java.util.ArrayList; 4 import java.util.List; 5 6 /* 7 * JDK5的新特性:自动拆装箱、泛型、增强for、静态导入、可变参数、枚举 8 * 9 * 增强for:...
list.add("ccc"); list.add("ddd"); for(int i=list.size()-1;i>=0;i--){ list.remove(i); } System.out.println(list.toString()); } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 结果: 移除指定元素: public static void descRemove(List<Integer>list,Integer val...
Java 增强 for 循环(类似 for in 循环) 实现Iterable接口的类允许其对象成为增强型for语句的目标。 它是JDK5之后出现的,其内部原理是一个Iterator迭代器。 格式 for (数据类型 变量 : 数组或集合) {// 使用 变量 即可} 案例 import java.util.ArrayList;import java.util.List;public class test {public ...
Java Oracle Java is the #1 programming language and development platform. It reduces costs, shortens development timeframes, drives innovation, and improves application services. Java continues to be the development platform of choice for enterprises and developers....
Java can help reduce costs, drive innovation, & improve application services; the #1 programming language for IoT, enterprise architecture, and cloud computing.
for(int i=0;i<persons.length;i++){ System.out.println(persons[i]); } //使用增强for循环的数组遍历 String[] persons={"张三","李四","王五"}; for(String person:persons){ System.out.println(person); //传统的Iterator遍历集合 List<String> persons=new ArrayList<String>(); ...
list.add("Dmitri"); list.add("Mike"); // 利用set不允许元素重复的性质去掉相同的元素 Set<String> checkDuplicates = new HashSet<String>(); for (int i = 0; i < list.size(); i++) { String items = list.get(i); if (!checkDuplicates.add(items)) { ...
Collection stringList = java.util.Arrays.asList(strings); /* 开始遍历 */ for (Iterator itr = stringList.iterator(); itr.hasNext();) { Object str = itr.next(); System.out.println(str); } 而在Java语言的最新版本――J2SE 1.5中,引入了另一种形式的for循环。借助这种形式的for循环,现在可以...