• 定义数组存储三个商品对象，商品的属性：id，名字，价格，库存，创建三个商品对象，并把商品对象存入到数组中

public class Goods {private String id;private String name;private double price;private int count;public Goods(){}public Goods(String id, String name, double price, int count) {this.id = id;this.name = name;this.price = price;this.count = count;}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public int getCount() {return count;}public void setCount(int count) {this.count = count;}
}

public class GoodsTest {public static void main(String[] args) {//创建一个数组,动态初始化Goods[] arr = new Goods[3];//创建三个商品对象Goods g1 = new Goods("001","华为mate60",5999.0,100);Goods g2 = new Goods("002","保温杯",227.0,200);Goods g3 = new Goods("003","宁夏枸杞",12.7,70);//把商品添加到数组arr[0] = g1;arr[1] = g2;arr[2] = g3;for (int i = 0; i < arr.length; i++) {Goods goods = arr[i];System.out.println(goods.getId() + ", " + goods.getName() + ", " + goods.getPrice() + ", " + goods.getCount());}}
}

定义数组存储3部汽车对象，汽车的属性：品牌，价格，颜色。创建三个汽车对象，数据通过键盘录入而来，并把数据存入到数组中。

• 键盘录入
  • Java里面有一个类叫Scanner，可以接收键盘输入的数字
  • 第一步：导包，找Scanner这个类
    • import java.util.Scanner;
    • 导包必须在类定义的上边（public class上面）
  • 第二步：创建对象，开始使用Scanner这个类
    • Scanner sc = new Scanner(System.in);
    • sc为变量名可以改变，其他不能改
  • 第三步：接收数据
    • int i = sc.nextInt();
    • i为变量名可以改变，其他不能改
  • 注意：这种方式只能接收整数，输入字符小数会报错
  • 第一套体系(遇到空格、制表符、回车就停止接收，后面的数据不接收)
    • nextInt(); 接收整数
    • nextDouble(); 接收小数
    • next(); 接收字符串

    • 

    • 

  • 第二套体系(可以接收空格、制表符，遇到回车才停止接收)
    • nextLine(); 接收字符串
  • 两套体系不能混用，容易出错

public class Car {private String brand;private int price;private String color;public Car() {}public Car(String brand, int price, String color) {this.brand = brand;this.price = price;this.color = color;}public String getBrand() {return brand;}public void setBrand(String brand) {this.brand = brand;}public int getPrice() {return price;}public void setPrice(int price) {this.price = price;}public String getColor() {return color;}public void setColor(String color) {this.color = color;}
}

 

import java.util.Scanner;public class CarText {public static void main(String[] args) {//创建一个数组存储汽车对象Car[] arr = new Car[3];//创建汽车对象，数据来自键盘录入Scanner sc = new Scanner(System.in);for (int i = 0; i < arr.length; i++) {//创建汽车的对象Car c = new Car();//录入品牌System.out.println("请输入汽车的品牌");String brand = sc.next();c.setBrand(brand);//录入价格System.out.println("请输入汽车的价格");int price = sc.nextInt();c.setPrice(price);System.out.println("请输入汽车的颜色");String color = sc.next();c.setColor(color);//把汽车对象添加到数组中arr[i] = c;}//遍历数组for (int i = 0; i < arr.length; i++) {Car car = arr[i];System.out.println(car.getBrand() + ", " + car.getPrice() + ", " + car.getColor());}}
}