製作鬧鐘;我如何使個人數字有0之前在JComboBox

Question

public class frame { 

     genericclass twelveoclockfix; 
     JFrame Frame1; 
     JPanel j2; 
     JPanel j4; 
     JButton b1; 
     JTextField t1; 
     ArrayList<Integer> hour; 
     ArrayList<Integer> minute; 
     JComboBox<Integer> t2; 
     JComboBox<Integer> t3; 
     JComboBox<String> t4; 
     JPanel j1; 
     JLabel l1; 

     public frame() { 
       //twelveoclockfix = new genericclass(); 
       Frame1 = new JFrame("9gag's own: jClock"); 
       j2 = new JPanel(); 
       j4 = new JPanel(); 
       b1 = new JButton ("Get le Time!"); 
       t1 = new JTextField(10); 
       //h4x0r 
       minute = new ArrayList<Integer>(); 
       for (int i = 01; i <= 60; ++i) 
       { 
         minute.add(i); 
       } 
       //shplit 
       hour = new ArrayList<Integer>(); 
       for (int i = 1; i <= 12; ++i) { 
         hour.add(i); String.format("%05d", 2); 
       } 
       t2 = new JComboBox<>(hour.toArray(new Integer[0])); 
       t3 = new JComboBox<>(minute.toArray(new Integer[0])); 
       t4 = new JComboBox<>(new String[]{"AM", "PM"}); 
       j1 = new JPanel (new FlowLayout()); 
       l1 = new JLabel ("time in comic sans:"); 
       j1.add(l1); 
       j1.add(t1); 
       j2.add(b1); 
       j4.add(t2); 
       j4.add(t3); 
       j4.add(t4); 
       l1.setFont(new Font("Comic Sans MS",Font.PLAIN,20)); 
       t1.setFont(new Font("Comic Sans MS",Font.PLAIN,20)); 
       b1.setFont(new Font("Comic Sans MS",Font.PLAIN,20)); 
       Frame1.add(j1); 
       Frame1.add(j2); 
       Frame1.add(j4); 
       Frame1.setLayout(new FlowLayout()); 
       Frame1.setSize(400,150); 
       Frame1.setVisible(true); 
       Frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
       b1.addActionListener(new ActionListener() { 
         public void actionPerformed(ActionEvent e) { 
           t1.setText(""+genericclass.twelveoclockfix + ":" + genericclass.minfixed + " " + genericclass.AMPMtxt); 
           System.out.println(t2.getSelectedItem()); 
           JOptionPane.showMessageDialog(Frame1, "Le 9gag army waz h3r3!"); 
         } 
       }); 


     } 
} 

我想使它的數組列表中定義數字0-60，進入JComboBox。

有人可以指出我在正確的方向，以使單個數字的數字有一個0之前。

感謝

Answer 1

變化ArrayList<Integer> minute到ArrayList<String> minute。另外，更改JComboBox<Integer> t3到JComboBox<String> t3，並添加分鐘是這樣的：對於整數轉換爲補零個字符串

minute = new ArrayList<String>(); 
for (int i = 01; i <= 60; ++i) 
{ 
    if (i < 10) { 
     minute.add("0" + String.valueOf(i)); 
    } else { 
     minute.add(String.valueOf(i)); 
    } 
}