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Alex
arrayList
2 Answer(s)      7 years ago
Posted in : Java Beginners
When i call for viewComputer method from main class, I must check through the desktop arraylist and notebook arraylist.
How can I combine this two arraylist checking for throw out the msg of
"Computer list is empty!"
Currently I only can check for desktop arraylist empty if no desktop is added.
source code as below:

public void viewComputer() {//view all desktop and notebooks item.

if(desktopList.size()<=0) {
JOptionPane.showMessageDialog(null, "Computer list is empty");
return;}

String msg = "The computer are as follows: \n";
for(int i = 0; i < desktopList.size(); i++) {
Desktop temp = desktopList.get(i);
msg += temp;
msg += "\n";
}
for(int k = 0; k < notebookList.size(); k++){
Notebook temp2 = notebookList.get(k);
msg += temp2;
msg += "\n";
}
JOptionPane.showMessageDialog(null, msg);
}
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View Answers

February 20, 2010 at 12:32 AM


My apprehension is that, you should check desktopArrayList and notebookArrayList for empty to display msg - "Computer list is empty".
If its right ignore this, else below is the condition.

if(desktopArrayList.isEmpty() && notebookArrayList.isEmpty()){
//display message
}


February 20, 2010 at 12:33 AM


My apprehension is that, you should check desktopArrayList and notebookArrayList for empty to display msg - "Computer list is empty".
If its NOT right ignore this, else below is the condition.

if(desktopArrayList.isEmpty() && notebookArrayList.isEmpty()){
//display message
}

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