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我不知道爲什麼,但是這行代碼給出了NullPointerException
。我搜索創建一個用戶obj數組。在Java中,但是,我再也找不到任何問題。對象數組原因NullPointerException Java
private State[] states;
.
.
.
private void initializeStates()
{
states = new State[ stateNames.length ]; // Throws NullPointerException
for(int i = 0; i < stateNames.length; i++)
{
states[i] = new State();
states[i].setName(stateNames[i]);
states[i].setColor(stateColors.getColor());
}
} // End of initializeStates()
這裏是類:
public class State
{
private String stateName;
private String color;
private boolean isStartState;
private boolean isFinalState;
State()
{
stateName = new String(); // Can this line cause nullPtrException?
color = new String(); // Can this line cause nullPtrException?
isStartState = false;
isFinalState = false;
}
public void setName(String name){ stateName = name; }
public void setColor(String clr) { color = clr; }
public void makeStart() { isStartState = true; }
public void makeFinal() { isFinalState = true; }
}
你能後的堆棧跟蹤和指向異常的線? – 2013-04-24 22:37:25