Question

    Test[] array = new Test[3];

    array[0] = new RowBoat("Wood", "Oars", 10);
    array[1] = new PowerBoat("Fiberglass", "Outboard", 35);
    array[2] = new SailBoat("Composite", "Sail", 40);

I have the above array and I need to display the results to a swing GUI with a next button that will display the first index values, and when the next button is clicked it will display the next index values and so on.

    for (int i=0;; i++) {
            boatMaterialTextField.setText(array[i].getBoatMaterial());
            boatPropulsionField.setText(array[i].getBoatPropulstion());
    }

I have the above code working and of course it displays the last item in the array.

My question is: How would I display the first index in the array and when the user clicks next display the next item in the array as well as go to the previous index when a back button is clicked?

Simply put I need to page through each index when a button is clicked.

Answer 1

You do not need a loop. When the frame first loads you can simply display the first item in the array. You can then create a next button.

 JButton nextBtn;
 int currentIndex;

 ...

 currentIndex = 0;
 //display the first item in the array.
 boatMaterialTextField.setText(array[currentIndex].getBoatMaterial());
 boatPropulsionField.setText(array[currentIndex].getBoatPropulstion());

 nextBtn = new JButton("Next>>");
 nextBtn.addActionListener(new ActionListener(){
    public void actionPerformed(ActionEvent e){
       if(currentIndex < array.length){
        boatMaterialTextField.setText(array[++currentIndex].getBoatMaterial());
        boatPropulsionField.setText(array[currentIndex].getBoatPropulstion());     
       }
    }
 });

You can add another button for previous that simply decrements the currentIndex each time ensuring to check that it never becomes negative.

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