[英]I have a problem with do while loop in my project
就是这个程序,我把它设计成一个手机商店,我面临的问题是你选择回去后,程序会正常返回,但是你选择购买后下次重启程序。 我想要的是让它直接停止购买。
import java.util.Scanner;
public class MyStore {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
Phones phOne = new Phones("iPhone 13.");
phOne.phs(256);
phOne.php(904);
Phones phTwo = new Phones("Galaxy s22.");
phTwo.phs(512);
phTwo.php(1199);
Phones phThree = new Phones("Huawei p50 pocket.");
phThree.phs(512);
phThree.php(1699);
System.out.println("Welcom To My Store!\n-------*****-------");
int i = 1;
do {
System.out.println("Choose a phone please:");
System.out.println("1-iPhone 13.\n2-Galaxy s22.\n3-Huawei p50 pocket.");
int a = scan.nextInt();
System.out.println("-------*****-------");
switch(a) {
case 1:
phOne.print();
System.out.println("1-buy.\n2-go back.");
int bg1 = scan.nextInt();
if(bg1 == 1) {
System.out.println("Congratulations! we will deliver it to you.");
--i;
}
else if(bg1 == 2){
++i;
}
else {
System.out.println("Please choose 1 or 2.");
}
break;
case 2:
phTwo.print();
System.out.println("1-buy.\n2-go back.");
int bg2 = scan.nextInt();
if(bg2 == 1) {
System.out.println("Congratulations! we will deliver it to you.");
--i;
}
else if(bg2 == 2){
++i;
}
else {
System.out.println("Please choose 1 or 2.");
}
break;
case 3:
phThree.print();
System.out.println("1-buy.\n2-go back.");
int bg3 = scan.nextInt();
if(bg3 == 1) {
System.out.println("Congratulations! we will deliver it to you.");
i-=2;
}
else if(bg3 == 2){
++i;
}
else {
System.out.println("Please choose 1 or 2.");
}
break;
default:
System.out.println("Please choose 1, 2, or 3.");
}
}while(i >= 1);
}
}
如果您需要,这就是程序的其余部分。
import java.text.NumberFormat;
public class Phones {
NumberFormat nf = NumberFormat.getCurrencyInstance();
String name;
int storage;
double price;
public Phones(String name) {
this.name = name;
}
public void phs(int phs) {
storage = phs;
}
public void php(double php) {
price = php;
}
public void print() {
System.out.println("Model: "+name);
System.out.println("Storage: "+storage+"G");
System.out.println("Price: "+nf.format(price));
}
}
如果您希望程序在购买手机后停止,您需要使用布尔值实现 do-while 循环,然后在用户购买手机后将布尔值设置为 false。
boolean loop = true;
do {
System.out.println("Choose a phone please:");
System.out.println("1-iPhone 13.\n2-Galaxy s22.\n3-Huawei p50 pocket.");
int a = scan.nextInt();
System.out.println("-------*****-------");
switch(a) {
case 1:
phOne.print();
System.out.println("1-buy.\n2-go back.");
int bg1 = scan.nextInt();
if(bg1 == 1) {
System.out.println("Congratulations! we will deliver it to you.");
loop = false;
}
......
while(loop);
我建议更好地照顾你的变量名。 让它们变得明显和有意义,最终更容易调试!
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