如何使JTextArea粘贴到窗口

你好我想让这个TextArea坚持使用鼠标调整窗口大小，就像下按钮一样。 这是完全没有错误的代码，请一目了然。

import java.awt.BorderLayout; import java.awt.Component; import java.awt.Container; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.GridLayout; import java.awt.LayoutManager; import javax.swing.BoxLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextArea; import javax.swing.JTextField; import javax.swing.SwingUtilities; public class Rozklady extends JFrame { public Rozklady() { super(); } public void createGUI(){ setPreferredSize(new Dimension(400,150)); JPanel jp = new JPanel(); // jp.setLayout(new BoxLayout(jp, BoxLayout.Y_AXIS)); jp.setLayout(new GridLayout(0,1)); JPanel gora = new JPanel(); JPanel dol = new JPanel(); pack(); JTextArea jt1 = new JTextArea("JF1"); gora.add(jt1); jt1.setPreferredSize(new Dimension(getWidth(),getHeight()/2)); dol.setLayout(new BorderLayout()); JPanel lewo = new JPanel(); JPanel prawo = new JPanel(); JPanel srodek = new JPanel(); dol.add(lewo, BorderLayout.EAST); dol.add(prawo,BorderLayout.WEST); dol.add(srodek, BorderLayout.CENTER); lewo.setLayout(new GridLayout(2,2)); prawo.setLayout(new GridLayout(2,2)); srodek.setLayout(new GridLayout(0,1)); for(int i = 0; i < 4; i++){ lewo.add(new JButton(i+"")); prawo.add(new JButton(i+"")); if(i < 3){ srodek.add(new JTextField("JF"+i)); } } jp.add(gora); jp.add(dol); add(jp); setVisible(true); pack(); setDefaultCloseOperation(EXIT_ON_CLOSE); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { new Rozklady().createGUI(); } }); } } 

Answer 1

为您使用BorderLayout gora面板。 将文本区域放在中心：

 gora.setLayout(new BorderLayout()); gora.add(jt1, BorderLayout.CENTER); 

Answer 2

 // declare a GridLayout in constructor, one component will 'fill the container' JPanel gora = new JPanel(new GridLayout()); JPanel dol = new JPanel(); // this should be called after all components are added! BNI pack(); JTextArea jt1 = new JTextArea("JF1"); // be sure to use a scroll pane for multi-line text components gora.add(new JScrollPane(jt1)); // .. 

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可以实现拉伸单个组件以填充可用空间。 两种常见的方法是使用AlexR或GridLayout提到的BorderLayout 。 有关示例代码，请参阅此答案 。 我更喜欢GridLayout因为它更短（更少打字）。 ;）