我目前正在接受以下异常。问题出在Price类的构造函数部分。我该如何处理这个问题。我应该能够将价格2.29和日期10202017作为字符串
传递Price price = new Price("2.29", "10/20/2017");
但Price类应该有
private BigDecimal price;
private LocalDate effectiveDate;
我对转换没有好转。谁能告诉我如何实现这一目标并指导我。
理想的输出：
货号：1货号：土耳其三明治分类：杂货UPC：1001价格：2.29
错误
Exception in thread "main" java.time.format.DateTimeParseException: Text '10/20/2017' could not be parsed at index 0
at java.time.format.DateTimeFormatter.parseResolved0(Unknown Source)
at java.time.format.DateTimeFormatter.parse(Unknown Source)
at java.time.LocalDate.parse(Unknown Source)
at java.time.LocalDate.parse(Unknown Source)
at posPD.Price.<init>(Price.java:35)
at posTest.MainTest.main(MainTest.java:27)
主要班级
package posTest;
import java.math.BigDecimal;
import posPD.*;
public class MainTest {
public static void main(String[] args) {
// TODO Auto-generated method stub
Store myStore = new Store("1", "My Store 1");
TaxCategory taxCategory1 = new TaxCategory("Beverages");
TaxCategory taxCategory2 = new TaxCategory("Grocery");
Register register1 = new Register("Register 1");
Register register2 = new Register("Register 2");
Person person1 = new Person("David", "OK" ,"405000000", "800-800-1000");
Person person2 = new Person("Sally", "Ktm", "123456789", "000-000-0000");
Item item = new Item("1", "Turkey Sandwich");
Price price = new Price("2.029", "10/20/2017");
UPC upc = new UPC("1001");
//Price price = new Price("1.49", "2005");
//Session session = new Session();
try {
//CashDrawer cashDraw1 = new CashDrawer(1, BigDecimal.valueOf(500));
//System.out.println(cashDraw1);
//System.out.println(register.toString());
Cashier cashier1 = new Cashier("1", person1 , "Password1");
//person1.setCashier(cashier1);
//myStore.addCashier(cashier);
Cashier cashier2 = new Cashier("1", person2 , "Password1");
person1.setCashier(cashier1);
person2.setCashier(cashier2);
myStore.addCashier(cashier1);
myStore.addCashier(cashier2);
//CashDrawer cashDrawer1 = new CashDrawer("Drawer 1.");
CashDrawer cashDrawer1 = new CashDrawer(1, BigDecimal.valueOf(500));
CashDrawer cashDrawer2 = new CashDrawer(2, BigDecimal.valueOf(500));
myStore.addRegister(register1);
myStore.addRegister(register2);
register1.setCashDrawer(cashDrawer1);
register2.setCashDrawer(cashDrawer2);
//myStore.addTaxCategory(taxCategory1);
//myStore.addTaxCategory(taxCategory2);
Session session1 = new Session(cashier1, register1);
Session session2 = new Session(cashier2, register2);
myStore.addSession(session1);
myStore.addSession(session2);
myStore.addItem(item);
//myStore.addUPC(upc);
item.addUPC(upc);
//item.addPrice(price);
item.setTaxCategory(taxCategory2);
//myStore.addCashier(cashier2);
SaleLineItem sli = new SaleLineItem();
System.out.println("=========");
System.out.println( " "+myStore);
System.out.println("=========");
} catch(Exception e) {System.out.println("Exception exists");}
}
}
价格等级
package posPD;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.time.LocalDate;
import java.time.LocalDateTime;
/**
* Price details
*/
public class Price {
private BigDecimal price;
private LocalDate effectiveDate;
private Item item;
public Price() {
// TODO - implement Price.Price
//throw new UnsupportedOperationException();
}
/**
*
* @param price
* @param effectiveDate
*/
public Price(String price, String effectiveDate) {
// TODO - implement Price.Price
//throw new UnsupportedOperationException();
this();
BigDecimal bdprice = new BigDecimal (price);
this.price = bdprice;
LocalDate dt = LocalDate.parse(effectiveDate);
this.setEffectiveDate(dt);
}
/**
*
* @param date
*/
public Boolean isEffective(LocalDate date) {
// TODO - implement Price.isEffective
throw new UnsupportedOperationException();
/*
if (LocalDate.now().isAfter(date)) {
return false;
}
return true;
*/
}
/**
*
* @param quantity
*/
public BigDecimal calcAmountForQty(int quantity) {
// TODO - implement Price.calcAmountForQty
//throw new UnsupportedOperationException();
return price;
}
/**
*
* @param date
*/
/*
public Boolean isPriceEffectiveForDate(LocalDate date) {
// TODO - implement Price.isPriceEffectiveForDate
throw new UnsupportedOperationException();
}
*/
/**
*
* @param price
*/
public void compareTo(Price price) {
// TODO - implement Price.compareTo
throw new UnsupportedOperationException();
}
public String toString() {
// TODO - implement Price.toString
throw new UnsupportedOperationException();
//return
}
public Item getItem() {
return item;
}
public void setItem(Item item) {
this.item = item;
}
public LocalDate getEffectiveDate() {
return effectiveDate;
}
public void setEffectiveDate(LocalDate effectiveDate) {
this.effectiveDate = effectiveDate;
}
}
答案 0 :(得分：1)
您使用的LocalDate.parse的一个参数版本需要此格式的CharSequence（＆＃34; yyyy-MM-dd＆＃34;）。您可以通过这种方式格式化日期，例如
void main(){
struct stat time_buf;
time_t input_timestamp=0;
while(1){
if(access( "inpfile.txt", F_OK ) != -1){
sleep(5);
stat("inpfile.txt", &time_buf);
if(time_buf.st_mtime > input_timestamp){
FILE *fpi,*fpo;
long length;
char *buffer=0;
fpi = fopen("inpfile.txt","r");
fseek(fpi,0,SEEK_END);
length=ftell(fpi);
fseek(fpi,0,SEEK_SET);
buffer=(char *)malloc(length);
fread(buffer,1,length,fpi);
fclose(fpi);
fpo=fopen("outfile.txt","w+");
fwrite(buffer,sizeof(char),length,fpo);
fclose(fpo);
input_timestamp=time_buf.st_mtime;
}
}
}
}
最好通过使用这样的DateTimeFormatter来支持您使用的String格式（＆＃34; 10/20 / 2017＆＃34;）：
Price price = new Price("2.29", "2017-10-20");
[编辑以根据您的评论添加测试示例]：
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MM/dd/yyyy");
LocalDate dt = LocalDate.parse(effectiveDate, formatter);
对我来说，这输出以下内容没有错误：
String input1 = "2017-10-20";
LocalDate date1 = LocalDate.parse(input1);
System.out.println("Using no formatter input1["+input1+"] date1 ["+date1+"]");
String input2 = "10/20/2017";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MM/dd/yyyy");
LocalDate date2 = LocalDate.parse(input2, formatter);
System.out.println("Formatter MM/dd/yyyy input2["+input2+"] date2 ["+date2+"]");
答案 1 :(得分：1)
DateTimeFormatter dtf = DateTimeFormatter.ofPattern("MM/dd/yyyy");
LocalDate dt = LocalDate.parse(effectiveDate, dtf);
答案 2 :(得分：1)
看看你得到的例外 -
Exception in thread "main" java.time.format.DateTimeParseException: Text '10/20/2017' could not be parsed at index 0.
您以MM / dd / yyyy格式提供日期，但在LocalDate类中，您无法指定格式，因此请更改您的代码，如
DateTimeFormatter format = DateTimeFormatter.ofPattern("MM/dd/yyyy");
LocalDate date = LocalDate.parse(effectiveDate, format);