商品录入查询
package day0604;
import java.util.Scanner;
public class Test1 {
static Item[] items = new Item[5];
public static void main(String[] args) {
String[] name = {"商品1","商品2","商品3","商品4","商品5"};
double[] price = {123.33,234.33,2423.32,2423.42,23423.22};
int[] num = {234,234,2,23432,342};
for (int i = 0; i < items.length; i++) {
items[i] = new Item();
items[i].name = name[i];
items[i].price = price[i];
items[i].number = num[i];
}
outer:
while(true)
{
menu();
int i = new Scanner(System.in).nextInt();
switch (i)
{
case 1: f1();break;
case 2: f2();break;
case 3: f3();break;
case 4: f4();break;
case 5: break outer;
}
}
}
private static void menu()
{
System.out.println("1:商品列表");
System.out.println("2:商品录入");
System.out.println("3:商品查询");
System.out.println("4:统计信息");
System.out.println("5:退出");
System.out.print("选择:");
}
private static void f4()
{
double totalPrice = 0;
double allPrice = 0;
double maxTotalPrice = 0;
double maxPrice = 0;
for (int i=0;i<items.length;i++)
{
totalPrice += items[i].price*items[i].number;
allPrice += items[i].price;
if(items[i].price > maxPrice) maxPrice = items[i].price;
if(items[i].price*items[i].number > maxTotalPrice) maxTotalPrice = items[i].price*items[i].number;
}
System.out.println("总价:"+totalPrice);
System.out.println("单价均价:"+allPrice/items.length);
System.out.println("最高总价:"+maxTotalPrice);
System.out.println("最高单价:"+maxPrice);
}
private static void f3()
{
System.out.print("输入要查询的商品名:");
String s = new Scanner(System.in).nextLine();
for (int i=0;i<items.length;i++)
{
if(s.equals(items[i].name))
{
System.out.println(items[i]);
return;
}
}
System.out.println("找不到商品");
}
private static void f2()
{
for (int i=0;i<items.length;i++)
{
System.out.println("录入第"+(i+1)+"件商品:");
System.out.print("名称:");
items[i].name = new Scanner(System.in).nextLine();
System.out.print("价格:");
items[i].price = new Scanner(System.in).nextDouble();
System.out.print("数量:");
items[i].number = new Scanner(System.in).nextInt();
}
f1();
}
private static void f1()
{
for(int i=0;i<items.length;i++)
{
System.out.println(items[i]);
}
}
}
package day0604;
public class Item {
String name;
double price;
int number;
@Override
public String toString() {
return "商品名称:"+this.name+"价格:"+this.price+"数量:"+this.number;
}
}
随机抽奖
package day0605;
import java.util.Arrays;
import java.util.Random;
import java.util.Scanner;
public class Test1 {
public static void main(String[] args) {
String s = "A;0/B;0/C;0";
String[] split = s.split("/");
Student[] t = new Student[split.length];
for (int i = 0; i < split.length; i++) {
String[] temp = split[i].split(";");
Student stu = new Student();
stu.name = temp[0];
stu.times = Integer.parseInt(temp[1]);
t[i] = stu;
}
System.out.print("按回车抽奖:");
while (true)
{
new Scanner(System.in).nextLine();
Student[] r = new Student[2];
for (int i = 0; i < r.length; i++) {
int j;
do {
j = new Random().nextInt(t.length);
}while (t[j].flag);
t[j].flag = true;
t[j].times++;
r[i] = t[j];
}
for (int i = 0; i < r.length; i++) {
System.out.println(r[i]);
r[i].flag = false;
}
}
}
}
package day0605;
public class Student {
String name;
int times;
boolean flag;
@Override
public String toString() {
return name+";"+times;
}
}
AK47
package day0606;
import java.util.Random;
public class AK47 {
int bullets = 30;
public void shoot()
{
if(bullets == 0)
{
System.out.println("没有子弹了");
return;
}
int d = new Random().nextInt(9)+1;
if(d>bullets) d = bullets;
bullets -= d;
System.out.println("发射了"+d+"发子弹,还剩余"+bullets);
}
public void reload()
{
bullets = 30;
}
}
package day0606;
import java.util.Scanner;
public class Test1 {
public static void main(String[] args) {
AK47[] a = {new AK47(),new AK47()};
System.out.print("按回车发射");
while (true)
{
String s = new Scanner(System.in).nextLine();
if(s.equals("load1")) a[0].reload();
else if(s.equals("load2")) a[1].reload();
else {
a[0].shoot();
a[1].shoot();
}
}
}
}