計算與載體

Question

日期之間天差？回想一下，vS必須大於vE？實際上，我應該分成兩種方法：隨機日期和其他計算差異。

/* 
* Randomizacao 
*/ 
package random04DiferencaDataVetor; 

import java.text.DateFormat; 
import java.text.ParseException; 
import java.text.SimpleDateFormat; 
import java.util.Date; 
import java.util.Random; 

public class Random04DiferencaDataVetor { 

    public static void main(String[] args) throws ParseException { 


     final long intervalo = 1000000000; 
     Random rnd = new Random(); 
     String[] vE = new String[5]; 
     String[] vS = new String[5]; 
     for (int i = 0; i < vE.length; i++) { 
      /* 
      * arrumar vetores para gerar datas aleatorias 
      * lembrando que vS deve ser maior que vE 
      */ 
      retornaData(); 
     } 
    } 

    static void retornaData() throws ParseException { 
     final long intervalo = 1000000000; 
     Random rnd = new Random(); 
     // formatando as datas 
     DateFormat formato = new SimpleDateFormat("yyyy"); 
     Date anoE = formato.parse("2012"); 
     long timeE = anoE.getTime(); 
     Date anoS = formato.parse("2013"); 
     long timeS = anoS.getTime(); 
     // define o intervalo de datas em 1 ano 
     long tempoIntervalo = timeE - timeS; 
     // randomiza a data de entrada 
     long rndTempoE = timeE + (long) (rnd.nextDouble() * tempoIntervalo); 
     // data entrada 
     String dataE = new SimpleDateFormat("hh:mm dd/MM/yyyy").format(rndTempoE); 
     // randomiza a data de saida 
     long rndTempoS = rndTempoE + (long) (rnd.nextDouble() * intervalo * 2); 
     // data de saida 
     String dataS = new SimpleDateFormat("hh:mm dd/MM/yyyy").format(rndTempoS); 
     // formato de data 
     SimpleDateFormat sdf = new SimpleDateFormat("hh:mm dd/MM/yyyy"); 
     try { 
      Date dataEnt = sdf.parse(dataE); 
      Date dataSaida = sdf.parse(dataS); 
      long differenceMilliSeconds = dataSaida.getTime() - dataEnt.getTime(); 
      long days = differenceMilliSeconds/1000/60/60/24; 
      long hours = (differenceMilliSeconds % (1000 * 60 * 60 * 24))/1000/60/60; 
      long minutes = (differenceMilliSeconds % (1000 * 60 * 60))/1000/60; 
      System.out.println(days + " days, " + hours + " hours, " + minutes + " minutes."); 
     } catch (ParseException e) { 
      e.printStackTrace(); 
     } 
    } 
} 

Answer 1

1. 你已經宣佈Array不是Vector。您可以使用如下`矢量聲明：

   Vector<String> vE = new Vector<String>(); 
   Vector<String> vS = new Vector<String>(); 
   

   但你可能要代替Vector如下使用List/ArrayList：

   List<String> vE = new ArrayList<String>(); 
   List<String> vS = new ArrayList<String>(); 
   

2. 添加日期字符串中的載體，可以使用如下add方法：

   String dateString1 = "01/01/2012"; 
   vE.add(dateString1); 
   

3. 加5個日期你的載體vE，你可以做的爲b elow：

   for (int i = 0; i < 5; i++) { 
       int day = 1+ rnd.nextInt(28); //day from 1 to 28 
       int month = 1+rnd.nextInt(12); //day from 1 to 12 
       int year = 2000 +rnd.nextInt(13); //year from 2000 to 2012 
       String dateString = month+"/"+day+"/"year; 
       vE.add(dateString); 
   } 
   

4. 您可能想通過矢量vE在retornaData();法計算的差異：

    //call in `main` method outside the `for` loop as: 
       retornaData(vE); 
   
       //change method signature as 
       static void retornaData(Vector<String> vE) throws ParseException { 
   

5. 裏面retornaData()，你可能想獲取兩個日期字符串和計算的區別：

   String date1 = vE.get(0);//use some index 
       String date2 = vE.get(1); //use some index 
   
       //compute the difference between date1 and date2 
   

如果您可以在您的示例程序中使用英語，我可以嘗試建議進一步的更正/改進。