創建新對象錯誤JAVA的Android

Question

我打算要創造一個新的對象的方法，所以我可以更新方法，每次我把它叫做

這裏是代碼：

public class CollectedData { 
    List<BusSearchOuterDataResults> busData = new ArrayList<BusSearchOuterDataResults>(); 
    public BusSearchOuterDataResults outerData; 
    public void createNewOuterDataObject(){ 
     outerData = new BusSearchOuterDataResults(); 
     this.outerData = outerData; 
    } 
    public void createNewInnerDataObject(){ 
     outerData.createNewInnerDataObject(); 
    } 
    public void addAllCollectedData(){ 
     busData.add(outerData); 
    } 
    public List<BusSearchOuterDataResults> getBusData(){ 
     return busData; 
    } 
} 

這是爲什麼當我調用createNewOuterDataObject方法時，它不會讓我創建一個新的，因爲我調用createNewOuterDataObject的類obj時沒有任何初始化？

public class BusSearchOuterDataResults { 
List<BusSearchInnerDataResults> innerData = new ArrayList<BusSearchInnerDataResults>(); 

private String routeNo; 
private String routeLabel; 
private String direction; 
public BusSearchInnerDataResults innerDataOBJ = new BusSearchInnerDataResults(); 

public BusSearchOuterDataResults(String routeNo, String routeLabel, String direction){ 
    this.routeNo = routeNo; 
    this.routeLabel = routeLabel; 
    this.direction = direction; 
} 

public BusSearchOuterDataResults(){ 

} 

public void createNewInnerDataObject(){ 
    BusSearchInnerDataResults innerDataOBJ = new BusSearchInnerDataResults(); 
    this.innerDataOBJ = innerDataOBJ; 
} 
public void addAllCollectedData(){ 
    innerData.add(new BusSearchInnerDataResults()); 
} 

public void setRouteNo(String routeNo){ 
    this.routeNo = routeNo; 
} 
public void setRouteLabel(String routeLabel){ 
    this.routeLabel = routeLabel; 
} 
public void setDirection(String direction){ 
    this.direction = direction; 
} 
public String getrouteNo(){ 
    return routeNo; 
} 
public String getrouteLabel(){ 
    return routeLabel; 
} 
public String getdirection(){ 
    return direction; 
} 
public List<BusSearchInnerDataResults> getData(){ 
    return innerData; 
} 
} 

Answer 1

你的代碼不正確：

public void createNewOuterDataObject(){ 
    outerData = new BusSearchOuterDataResults(); // here you are initializing your field 
    this.outerData = outerData; // but here ? what is this line for ? 
} 

第二線什麼都不做，它喜歡做

int x = 0 ; 
x=x;