这个程序应该减去2天tare3和tare4。 tare3从当前日期(从系统)开始,从文本文件(元素[3])中获取tare4值,当我将字符串(元素[3])解析为日期(tare4)时,它给出了`%parseexception 保存在文件中的日期看起来像(1月24日00:00:00 EET 2018)
package javaapplication3;
import java.io.*; ` `
import java.util.*;
import java.text.*;
public static void main(String[] args) throws ParseException, FileNotFoundException {
private static String tare5 = new String();
static String tare2 = new String ();
DateFormat dateFormat = new SimpleDateFormat(" dd MMM yyyy ",Locale.ENGLISH );
Calendar cal = Calendar.getInstance();
Date tare4 = new Date ();
tare5 = dateFormat.format(cal.getTime());
Date tare3 = dateFormat.parse(tare5);
Scanner scanner;
File Myfile = new File("C:\\Users\\mido\\Documents\\NetBeansProjects\\JavaApplication3\\src\\javaapplication3\\products.txt");
scanner = new Scanner (Myfile);
while (scanner.hasNext()){
String line = scanner.nextLine();
StringTokenizer x = new StringTokenizer(line,"~");
String [] element= new String [7];
int counter = 0 ;
while (x.hasMoreElements())
{
element[counter]=(String)x.nextElement();
counter ++;
}
tare4 = dateFormat.parse(element[3]);
if (tare4.getTime()>= tare3.getTime() )
{
System.out.println(element[1]+"is expired");
}
else {
long def = tare3.getTime()- tare4.getTime();
System.out.println(element[1]+"has"+def+"to expire");}
}
}