在BorderLayout中更改/設置JTextField的高度

Question

我試圖設置JTextField的高度。目前它的顯示尺寸爲JFrame。任何想法如何將高度設置爲50？

編輯：這裏是修改後的代碼以及截圖謝謝！

public class Display extends JFrame { 

    private DrawCanvas canvas; 
    private JTextField Altitude; 
    private JTextField TASpeed; 
    private JLabel altButton; 
    private int countA = 0; 
    private int countS = 0; 
    private int Bcount1 = 0; 
    public String Ccount = Integer.toString(Bcount1); 

    public Display() { 
     canvas = new DrawCanvas(); 
     canvas.setPreferredSize(new Dimension(CANVAS_WIDTH, CANVAS_HEIGHT)); 
     canvas.setLayout(new BorderLayout()); 
     Container cp = getContentPane(); 
     cp.setLayout(new BorderLayout()); 
     cp.add(canvas, BorderLayout.LINE_START); 

     //here are the 2 side fields![enter image description here][2] 
     Altitude = new JTextField("0", 5); 
     Altitude.setHorizontalAlignment(JTextField.CENTER); 
     Altitude.setEditable(false); 
     Altitude.setOpaque(false); 
     Altitude.setFont(Altitude.getFont().deriveFont(25f)); 

     TASpeed = new JTextField("0", 5); 
     TASpeed.setHorizontalAlignment(JTextField.CENTER); 
     TASpeed.setEditable(false); 
     TASpeed.setOpaque(false); 
     TASpeed.setFont(Altitude.getFont().deriveFont(25f)); 

     altButton = new JLabel(); 
     altButton.setText(Ccount); 

     canvas.add(altButton, BorderLayout.SOUTH); 

     canvas.add(Altitude, BorderLayout.LINE_END); 
     canvas.add(TASpeed, BorderLayout.LINE_START); 

     canvas.add(new JLabel(Ccount), BorderLayout.SOUTH); 

     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     setTitle("FLIGHT DISPLAY"); 
     pack(); 
     setVisible(true); 
     requestFocus(); 
    } 

    class DrawCanvas extends JPanel { 

     public void paintComponent(Graphics g) { 
      super.paintComponent(g); 
      setBackground(CANVAS_BACKGROUND); 

      g.setColor(GROUND_COLOR); 
      g.drawString(Ccount, 100, 100); 

     } 
    } 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 

      public void run() { 
       new Display(); 
      } 
     }); 
    } 
} 

Answer 1

由於@kleopatra正確意見，JTextField可以計算出它是一個基於該平臺設計的選擇Font自己的首選大小。這個例子改變了大小。

import java.awt.BorderLayout; 
import java.awt.Dimension; 
import java.awt.EventQueue; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.JTextField; 

/** @see http://stackoverflow.com/a/14734937/230513 */ 
public class Test { 

    private void display() { 
     JFrame f = new JFrame("Test"); 
     f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     JTextField tfCount = new JTextField("42", 8); 
     tfCount.setHorizontalAlignment(JTextField.CENTER); 
     tfCount.setFont(tfCount.getFont().deriveFont(50f)); 
     f.add(tfCount, BorderLayout.NORTH); 
     f.add(new JPanel() { //placeholder 

      @Override 
      public Dimension getPreferredSize() { 
       return new Dimension(320, 240); 
      } 
     }, BorderLayout.CENTER); 
     f.pack(); 
     f.setLocationRelativeTo(null); 
     f.setVisible(true); 
    } 

    public static void main(String[] args) { 
     EventQueue.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       new Test().display(); 
      } 
     }); 
    } 
}