*/ public class ArrayListDemo1 { public static void main(String[] args) { // 1、创建一个ArrayList的集合对象 // ArrayList<String> list = new ArrayList<String>(); // 从jdk 1.7开始才支持的 ArrayList<String> list = new ArrayList<>(); list.add("黑马"); list.add("黑马"); list.add("...
2. List 和 Map 的代码示例 2.1 List 示例 下面的代码示例展示了如何使用ArrayList来存储水果名称并遍历它们: importjava.util.ArrayList;importjava.util.List;publicclassListExample{publicstaticvoidmain(String[]args){List<String>fruits=newArrayList<>();// 添加元素fruits.add("Apple");fruits.add("Banana")...
public class StudentTest3 { public static void main(String[] args) { //变量创建对象 //创建一个拥有20个元素的学生对象,要求学号是1~20,姓名随机产生,年级1-6,分数10-100 Student[] stuArr = new Student[5]; String[] names1 = {"赵", "钱", "孙", "李", "周", "吴", "郑", "王"...
*/publicclassArrayListDemo1 {publicstaticvoidmain(String[] args) {//1、创建一个ArrayList的集合对象//ArrayList<String> list = new ArrayList<String>();//从jdk 1.7开始才支持的ArrayList list =newArrayList(); list.add("ctgu"); list.add(66); list.add("java"); System.out.println(list);//2...
packagecom.itheima.d1_collection;importjava.util.ArrayList;importjava.util.Collection;importjava.util.HashSet;/**目标:明确Collection集合体系的特点*/publicclassCollectionDemo1 {publicstaticvoidmain(String[] args) {// 有序 可重复 有索引 List家族Collection list =newArrayList(); ...
474 - Parsing Values from a String 11:25 475 - Reading User Input 12:27 476 - Problems and Solutions 10:22 477 - Reading User Input Challenge 15:08 478 - Min and Max Challenge 15:33 479 - Introduction 00:38 480 - Classes Part 1 16:32 481 - Classes Part 2 13:28 48...
Java为了方便我们处理字符串,所以给我们提供了一个String类来代表字符串,这个类就是java.lang包下。 按照面向对象的编程思想,对于字符串的操作,只需要创建字符串对象,用字符串对象封装字符串数据,然后调用String类的方法就可以了。 2. String创建对象 接下来我们打开String类的API,看一下String类的对象如何创建。如下...
百家姓字符串数组 代码语言:javascript 复制 privatestaticfinal String[]NAME_LIST={"赵","钱","孙","李","周","吴","郑","王","冯","陈","褚","卫","蒋","沈","韩","杨","朱","秦","尤","许","何","吕","施","张","孔","曹","严","华","金","魏","陶","姜","...
/*public String lineFistNameString(){ firstName = new BuildFirstName().insideFirstName(); lastName = new BuildLastName().insideLastName(); name = firstName + lastName; return name; }*/ /*随机生成多个人名,通过list实现*/ public ArrayList lineFistName String(int index){ ...
//在创建ArrayList集合对象时ArrayList list1 = new ArrayList();ArrayList<String> list2 = new ArrayList<String>();//list1这个集合可以存储任意类型的数据//而list2因为加上了String的约束,所以只能存储String类型的数据//JDK1.7开始才支持的 注意: