[上]JAVA学习系列模块五第二章103.数组操作_存储数据
视频
笔记
存储元素
1.格式:
数组名[索引值] = 值 -> 将等号右边的值放到数组指定的索引位置上
public class Demo02Array { public static void main(String[] args) { int[] arr = new int[3]; arr[0] = 100;//将100存到了arr这个数组的0索引上 arr[1] = 200;//将200存到了arr这个数组的1索引上 arr[2] = 300;//将300存到了arr这个数组的2索引上 //arr[3] = 1000; System.out.println("============================"); String[] arr1 = new String[3]; arr1[0] = "东方不败"; arr1[1] = "岳不群"; arr1[2] = "林平之"; } }
public class Demo03Array { public static void main(String[] args) { //键盘录入三个整数,存储到数组中 int[] arr = new int[3]; Scanner sc = new Scanner(System.in); /* 先看等号右边的,先录入,将录入的数据保存到指定的索引位置上 */ /* arr[0] = sc.nextInt(); arr[1] = sc.nextInt(); arr[2] = sc.nextInt();*/ /* for (int i = 0; i < 3; i++) { arr[i] = sc.nextInt(); }*/ for (int i = 0; i < arr.length; i++) { arr[i] = sc.nextInt(); } } }
public class Demo04Array { public static void main(String[] args) { //定义一个长度为3的数组 int[] arr = new int[3]; Random rd = new Random(); //arr[0] = rd.nextInt(10); //arr[1] = rd.nextInt(10); //arr[2] = rd.nextInt(10); for (int i = 0;i