如何JPanel中添加

Question

我創建了一個類名爲框架簡單地創建一個框架創建的框架：

package panels; 

public class Frame extends prog 
{ 

    public Frame() { 


     JFrame myFrame = new JFrame(); 

     myFrame.setLayout(new FlowLayout()); 

     myFrame.setTitle("GUI Demo - ISTE-121"); 
     myFrame.pack(); 
     myFrame.setLocation(600,300); 
     myFrame.setSize(400,200); 
     myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     myFrame.setVisible(true); 



    } 

} 

然後，我已經加入該幀的main()：

package panels; 

public class prog { 

    public static void main(String args[]) { 
     Frame first = new Frame(); 
    } 
} 

我已經創建了一個名爲面板的類，並且希望將其添加到類框架中。我應該怎麼做？

子類如下：您的第一個類的

public class panels extends Frame { 

     final JTextField items; 
     final JTextField number; 
     final JTextField cost; 
     final JTextField amount; 


    public panels() 
    { 


     JPanel order = new JPanel(); 
      order.setLayout(new GridLayout(5,5,2,2)); 


      order.add(new JLabel("Item no:", SwingConstants.RIGHT)); 
      order.add(items = new JTextField(3)); 

      order.add(new JLabel("Number of:", SwingConstants.RIGHT)); 
      order.add(number = new JTextField(3)); 

      order.add(new JLabel("Cost", SwingConstants.RIGHT)); 
      order.add(cost = new JTextField(3)); 

      order.add(new JLabel("Amount owed:", SwingConstants.RIGHT)); 
      order.add(amount = new JTextField(10)); 
      amount.setEditable(false); 

    } 
} 

Answer 1

更改名稱。這個類必須擴展一個JFrame，而面板類應該擴展JPanel。您應該瞭解佈局管理器，將面板添加到容器。它是Swing的基礎。它是你的程序的改進代碼：

class MyFrame extends JFrame { 
    public MyFrame() { 

     JFrame myFrame = new JFrame(); 

     myFrame.setLayout(new FlowLayout()); 

     myFrame.add(new panels()); 
     myFrame.setTitle("GUI Demo - ISTE-121"); 
     myFrame.pack(); 
     myFrame.setLocation(600,300); 
     myFrame.setSize(400,200); 
     myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     myFrame.setVisible(true); 

    } 
} 

class panels extends JPanel { 

    final JTextField items; 
    final JTextField number; 
    final JTextField cost; 
    final JTextField amount; 


    public panels() { 
     setLayout(new GridLayout(5,5,2,2)); 

     add(new JLabel("Item no:", SwingConstants.RIGHT)); 
     add(items = new JTextField(3)); 

     add(new JLabel("Number of:", SwingConstants.RIGHT)); 
     add(number = new JTextField(3)); 

     add(new JLabel("Cost", SwingConstants.RIGHT)); 
     add(cost = new JTextField(3)); 

     add(new JLabel("Amount owed:", SwingConstants.RIGHT)); 
     add(amount = new JTextField(10)); 
     amount.setEditable(false); 

    } 
} 

public class FrameTest { 

    public static void main(String args[]) { 
     MyFrame first = new MyFrame(); 
    } 
}