測試夾具不會初始化一個數組

Question

我試圖測試我的旅程類方法，但是，任何使用jArray字段的方法都會給出空指針異常，因爲數組列表實際上並未創建。我的印象是，我的測試夾具可以解決這個問題，但問題仍然存在，任何幫助表示讚賞。

private buscard.Journey tj1; 
    private buscard.Journey tj2; 


    /** 
    * Default constructor for test class JourneyTest 
    */ 
    public JourneyTest() 
    { 
     tj1 = new buscard.Journey(20120101, 120000, "74", 1); 
     tj2 = new buscard.Journey(20120102, 120000, "74", 1); 
     ArrayList<Journey> jArray = new ArrayList<Journey>(); 
     jArray.add(tj1); 
    } 

    /** 
    * Sets up the test fixture. 
    * 
    * Called before every test case method. 
    */ 
    protected void setUp() 
    { 
     tj1 = new buscard.Journey(20120101, 120000, "74", 1); 
     tj2 = new buscard.Journey(20120102, 120000, "74", 1); 
     ArrayList<Journey> jArray = new ArrayList<Journey>(); 
     jArray.add(tj1); 
    } 
    public void testGetDate() 
    { 
     Journey testJ1 = new Journey(20120101, 12.00, "74", 1); 
     assertEquals(20120101, testJ1.getDate()); 
    } 
    public void testGetTime(){ 
     Journey testJ1 = new Journey(20120101, 12.00, "74", 1); 
     assertEquals(12.0, testJ1.getTime()); 
    } 
    public void testGetBusNumber(){ 
     Journey testJ1 = new Journey(20120101, 12.00, "74", 1); 
     assertEquals("74", testJ1.getBusNumber()); 

    } 
    public void testConstructor(){ 
     Journey testJ1 = new Journey(20120101, 12.00, "74", 1); 
     assertEquals("74", testJ1.getBusNumber()); 
     assertEquals(12.0, testJ1.getTime()); 
     assertEquals(20120101, testJ1.getDate()); 
    } 

} 
package buscard; 
import java.util.ArrayList; 
/** 
* Write a description of class journey here. 
* 
* @author (your name) 
* @version (a version number or a date) 
*/ 
class Journey 
{ 
    public int date; 
    public double time; 
    public String busNumber; 
    public int journeyType; 
    public static double dayCharge = 0; 
    public static final double maxDayCharge = 3.50; 
    public static double weekCharge = 0; 
    public static final double maxWeekCharge = 15; 
    public static double monthCharge = 0; 
    public static final double maxMonthCharge = 48; 
    private int journeyNumber; 
    private static int numberOfJourneys = 0; 
    public double costOfJourney; 
    public static ArrayList<Journey> jArray; 


    public Journey(int date, double time, String busNumber, int journeyType) 
    { 
     this.date = date; 
     this.time = time; 
     this.busNumber = busNumber; 
     this.journeyType = journeyType;  
     journeyNumber = ++numberOfJourneys; 

    } 

    static 
    { 
     ArrayList<Journey> jArray = new ArrayList<Journey>();    
    } 

    public int getDate(){ 
     return date; 
    } 

    public double getTime(){ 
     return time; 
    } 

    public String getBusNumber(){ 
     return busNumber; 
    } 

    public double getCostOfJourney(){ 
     return costOfJourney; 
    } 

    public int getJourneyType(){ 
     return journeyType; 
    } 
    public boolean isInSequence(int date, double time){ 
     Journey prevJourney = jArray.get(jArray.size()-1); 
     return((prevJourney.getDate() < date)||(prevJourney.getDate() == date && prevJourney.time < time));      
    }   

    public static double returnLeast(){ 
     double d = maxDayCharge - dayCharge; 
     double m = maxMonthCharge - monthCharge; 
     double w = maxWeekCharge - weekCharge; 
     double least = 0; 
     if (d <= w && d <= m) 
     { 
      least = d; 
     } 
     else if(w <= d && w <= m) 
     { 
      least = w; 
     } 
     else if(m <= d && m <= w) 
     { 
      least = m; 
     } 

     return least; 
    } 

     public double journeyCost(Journey reqJourney){     
     if (journeyType == 1){         
      if (dayCharge <= 2.50 && weekCharge <= 14 && monthCharge <= 47) 
      { 
       costOfJourney = 1; 
      } 
      else 
      { 
       costOfJourney = returnLeast(); 
      } 

     } 
     else if (journeyType == 2) 
     { 
      if (dayCharge <= 1.80 && weekCharge <= 13.30 && monthCharge <= 46.30) 
      { 
       costOfJourney = 1.70; 
      } 
      else 
      { 
       costOfJourney = returnLeast(); 
      } 
     } 
     else if (journeyType == 3) 
     { 
      if (dayCharge <= 1.60 && weekCharge <= 13.10 && monthCharge <= 46.10) 
      { 
       costOfJourney = 1.90; 
      } 
      else 
      { 
       costOfJourney = returnLeast(); 
      } 

     }   
     return costOfJourney;  
    } 

    public static void updateCurrentCharges(int date){ 
     int newDayOfYear = DateFunctions.getYearDay(date); 
     int newWeekOfYear = DateFunctions.getYearWeek(date); 
     int newMonthOfYear = DateFunctions.getYearMonth(date); 

     if (newDayOfYear > WmBusPass.dayOfYear) 
     { 
      WmBusPass.dayOfYear = newDayOfYear; 
      dayCharge = 0; 
     } 
     if (newWeekOfYear > WmBusPass.weekOfYear) 
     { 
      WmBusPass.weekOfYear = newWeekOfYear; 
      weekCharge = 0; 
     } 
     if (newMonthOfYear > WmBusPass.monthOfYear) 
     { 
      WmBusPass.monthOfYear = newMonthOfYear; 
      monthCharge = 0; 
     } 
    } 

} 

Answer 1

jArray是靜態字段Journey類。 你應該

buscard.Journey.jArray = new ArrayList<Journey>();