無法在運行時調整文本字段的大小

Question

我再次更改了代碼。但是現在當我運行代碼時，文本框非常小。只有當我選擇左側，中間或右側對齊時，文本框大小纔會改變。 我在哪裏犯了這個錯誤。

我寫了下面的程序。當我點擊左側，右側或中心按鈕時，程序還應該讀取列大小文本框中的值，然後自動調整消息文本框的大小。我似乎無法做到這一點。任何見解將不勝感激。包含workingwithtexttexts的工作組;

package workingwithjtextfields; 

import java.awt.*; 
import java.awt.event.ActionListener; 
import java.awt.event.ActionEvent; 
import javax.swing.*; 
import javax.swing.border.*; 

public class WorkingwithJTextFields extends JFrame 
{ 
    // private int size = 100; 
    private JTextField jtfMessage = new JTextField(100); 

    private JTextField jtfColumn = new JTextField(5); 
    private JRadioButton jrbLeft,jrbCenter,jrbRight; 

    public static void main(String[] args) //Main program begins here. 
    { 
     JFrame frame = new WorkingwithJTextFields();//Instantiating an object. 
     frame.setTitle("Exercise 17.11");//Setting the frame title. 
     frame.setSize(470,110);//Setting the size. 
     frame.setLocationRelativeTo(null);//Setting the location. 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// Default closing options. 
     frame.setVisible(true);//Setting visibility to true. 
    }//End of main program 

    public WorkingwithJTextFields() 
    { 

    // jtfMessage.setColumns(100); 
    final JPanel parent = new JPanel(); 
    parent.setLayout(new GridLayout(2,1,3,3)); 

    final JPanel p1 = new JPanel(); 
    p1.setLayout(new FlowLayout(FlowLayout.LEFT,30,0)); 

    p1.add(new JLabel("TextField",SwingConstants.CENTER)); 

    jtfMessage= new JTextField("Type anything",SwingConstants.RIGHT); 
    jtfMessage.setHorizontalAlignment(SwingConstants.CENTER); 
    p1.add(jtfMessage); 

    parent.add(p1); 

    JPanel jpRadioButtons = new JPanel(); 
    jpRadioButtons.setLayout(new GridLayout(1,3)); 
    jpRadioButtons.add(jrbLeft= new JRadioButton("Left")); 
    jpRadioButtons.add(jrbCenter = new JRadioButton("Center")); 
    jpRadioButtons.add(jrbRight = new JRadioButton("Right")); 
    jpRadioButtons.setBorder(new TitledBorder("Horizontal Border")); 

    final JPanel p2 = new JPanel(); 
    p2.setLayout(new GridLayout(1,2,1,1)); 

    p2.add(jpRadioButtons); 

    JPanel p3 = new JPanel(); 
    p3.setLayout(new GridLayout(1,1,1,1)); 
    p3.add(new JLabel("Column Size")); 

    jtfColumn= new JTextField("60",SwingConstants.RIGHT); 
    jtfColumn.setHorizontalAlignment(SwingConstants.CENTER); 

    p3.add(jtfColumn);  
    Border lineBorder = new LineBorder(Color.LIGHT_GRAY,1); 
    p3.setBorder(lineBorder); 
    p2.add(p3); 
    parent.add(p2); 
    add(parent); 



    jrbLeft.addActionListener(
      new ActionListener() 
      { 
       public void actionPerformed(ActionEvent e) 
       { 
        jtfMessage.setHorizontalAlignment(SwingConstants.LEFT); 
        jrbCenter.setSelected(false); 
        jrbRight.setSelected(false); 
        jtfMessage.setColumns(Integer.parseInt(jtfColumn.getText())); 
       // p1.revalidate(); 
        // p1.repaint(); 
       } 
      } 
      ); 

    jrbCenter.addActionListener(
      new ActionListener() 
      { 
       public void actionPerformed(ActionEvent e) 
       { 
        jtfMessage.setHorizontalAlignment(SwingConstants.CENTER); 
        jrbLeft.setSelected(false); 
        jrbRight.setSelected(false); 
        jtfMessage.setColumns(Integer.parseInt(jtfColumn.getText())); 
       } 
      } 
      ); 

    jrbRight.addActionListener(
      new ActionListener() 
      { 
       public void actionPerformed(ActionEvent e) 
       { 
        jtfMessage.setHorizontalAlignment(SwingConstants.RIGHT); 
        jrbCenter.setSelected(false); 
        jrbLeft.setSelected(false); 
        jtfMessage.setColumns(Integer.parseInt(jtfColumn.getText())); 
       } 

      } 
      ); 

    } 

} 

Answer 1

主要問題是與GridLayout。

GridLayout根據設計，根據父容器的可用空間，給列/寬度中的組件賦予相等的寬度和高度。

相反，嘗試使用類似FlowLayout或GridBagLayout與替代組件首選大小