在gui中更改面板

我想要做的是每次按下按钮时改变GUI的右侧。 第一个按钮显示JLabel第二个按钮和JTextField 。 小组预期的结果变化。 结果是当我按下按钮时没有任何反应。

 package javaapplication37; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.*; public class Gui extends JFrame { JTextField f1; JPanel b, p1, p2; JPanel p3; JLabel l1; JButton b2, b1; String a; public Gui() { a="Input here"; setSize(600,600); l1=new JLabel("8a petuxei"); b = new JPanel(); p3 = new JPanel(); p1 = new JPanel(); p2 = new JPanel(); b.setLayout(new GridLayout(2, 1)); b1 = new JButton("Eleos"); b2 = new JButton("elpizw"); b.add(b1); b.add(b2); b.setSize(150,600); p1.setSize(450,600); add(b); add(p1); ActionListener pou = new Listener(p1); b1.addActionListener(pou); p2.add(l1); f1=new JTextField(a); a=f1.getText(); p3.add(f1); } public class Listener implements ActionListener { JPanel k; public Listener(JPanel k) { this.k = k; } @Override public void actionPerformed(ActionEvent e) { k.remove(getContentPane()); k.add(p2); } } public class l implements ActionListener { JPanel k; public l(JPanel k) { this.k = k; } @Override public void actionPerformed(ActionEvent e) { k.remove(getContentPane()); k.add(p3); } } } 

Answer 1

您需要使用CardLayout。 如果您需要帮助，请问我。

 import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.ArrayList; public class Gui extends JFrame implements ActionListener { private JPanel menu = new JPanel(); private CardLayout contentLayout = new CardLayout(); private JPanel content = new JPanel(contentLayout); private java.util.List cardList = new ArrayList<>(); public Gui() { int i; for (i = 0; i < 10; i++) { Card card; if(i % 2 == 0) card = new TextAreaCard("Card " + i, "this is the content for card #" + i); else card = new LabelCard("Card " + i, "content for Label Card #" + i); JButton btn = new JButton(card.name); menu.add(btn); btn.addActionListener(this); content.add(card, card.name); cardList.add(card); } menu.setLayout(new GridLayout(i, 1)); add(menu, BorderLayout.WEST); add(content, BorderLayout.CENTER); } @Override public void actionPerformed(ActionEvent e) { contentLayout.show(content, e.getActionCommand()); } class Card extends JPanel{ final String name; public Card(String name){ this.name = name; } } class TextAreaCard extends Card implements ActionListener { JTextArea textArea = new JTextArea(); JButton btn = new JButton("OK"); public TextAreaCard(String name, String text) { super(name); textArea.setText(text); setLayout(new BorderLayout()); add(textArea, BorderLayout.CENTER); add(btn, BorderLayout.SOUTH); btn.addActionListener(this); } @Override public void actionPerformed(ActionEvent e) { JOptionPane.showMessageDialog(this, textArea.getText(), "click OK", JOptionPane.NO_OPTION); } } class LabelCard extends Card{ JLabel label = new JLabel(); public LabelCard(String name, String text) { super(name); label.setText(text); add(label); } } public static void main(String [] args){ Gui gui = new Gui(); gui.setSize(600, 500); gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); gui.setVisible(true); } }