Java—在嵌套类中调用方法,特别是ActionListener
编辑:已解决,添加组件后我没有使用“validate()” 我有一个类似这样的GUI类(这是我代码的一个非常基本的表示): 编辑:这是我的全部代码Java—在嵌套类中调用方法,特别是ActionListener,java,swing,user-interface,Java,Swing,User Interface,编辑:已解决,添加组件后我没有使用“validate()” 我有一个类似这样的GUI类(这是我代码的一个非常基本的表示): 编辑:这是我的全部代码 package source; import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; public class Gui extends JFrame { public String[] list1 = {
package source;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class Gui extends JFrame
{
public String[] list1 = {"equation1","equation2","equation3","equation4", "equation5"};
public JOptionPane opt1;
private JButton custom;
private JTextField[] tf;
public HandlerClass2 itemhandler = new HandlerClass2();
private JList list;
private static int index = 0;
private static int lastlistindex = 0;
private JPanel buttonpanel;
private JPanel buttonpanel2[] = new JPanel[3];
private JPanel listpanel[] = new JPanel[4];
private JPanel checkpanel;
private JCheckBox checkboxes[];
private SpringLayout layout;
public Container contentPane;
private JButton but;
public Gui()
{
super("Physics Helper v0.1");
setBackground(Color.DARK_GRAY);
layout = new SpringLayout();
contentPane = getContentPane();
contentPane.setLayout(layout);
displayPortal();
}
public void displayPortal()
{
Icon a = new ImageIcon(getClass().getResource("button.png"));
Icon b = new ImageIcon(getClass().getResource("button2.png"));
custom = new JButton("", a);
custom.setRolloverIcon(b);
buttonpanel = new JPanel();
buttonpanel.setBackground(Color.GRAY);
buttonpanel.add(custom);
contentPane.add(buttonpanel);
layout.putConstraint(SpringLayout.WEST, buttonpanel, 5, SpringLayout.WEST, contentPane);
layout.putConstraint(SpringLayout.EAST, buttonpanel, -5, SpringLayout.EAST, contentPane);
layout.putConstraint(SpringLayout.NORTH, buttonpanel, 5, SpringLayout.NORTH, contentPane);
custom.addActionListener(new HandlerClass());
}
public void displayButton(String s)
{
but = new JButton(s);
buttonpanel2[index] = new JPanel();
buttonpanel2[index].setBackground(Color.GRAY);
buttonpanel2[index].add(but);
contentPane.add(buttonpanel2[index]);
layout.putConstraint(SpringLayout.SOUTH, buttonpanel2[index], -5, SpringLayout.SOUTH, contentPane);
if (index < 1)
{
layout.putConstraint(SpringLayout.WEST, buttonpanel2[index], 5, SpringLayout.WEST, contentPane);
}
else
{
layout.putConstraint(SpringLayout.WEST, buttonpanel2[index], 5, SpringLayout.EAST, buttonpanel2[index - 1]);
}
index++;
}
public void displayList(String[] t)
{
list = new JList(t);
list.setVisibleRowCount(8);
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
add(new JScrollPane(list));
listpanel[lastlistindex] = new JPanel();
listpanel[lastlistindex].setBackground(Color.GRAY);
listpanel[lastlistindex].add(list);
contentPane.add(listpanel[lastlistindex]);
layout.putConstraint(SpringLayout.NORTH, listpanel[lastlistindex], 5, SpringLayout.SOUTH, buttonpanel);
if (lastlistindex < 1)
{
layout.putConstraint(SpringLayout.WEST, listpanel[lastlistindex], 5, SpringLayout.WEST, contentPane);
}
else
{
layout.putConstraint(SpringLayout.WEST, listpanel[lastlistindex], 5, SpringLayout.EAST, listpanel[lastlistindex - 1]);
}
lastlistindex++;
}
public void displayInputValues(String[] p)
{
checkboxes = new JCheckBox[p.length];
GridLayout gridlayout = new GridLayout(p.length, 2);
tf = new JTextField[p.length];
checkpanel = new JPanel();
checkpanel.setBackground(Color.GRAY);
checkpanel.setLayout(gridlayout);
for (int b = 0; b < p.length; b++)
{
checkboxes[b] = new JCheckBox(p[b]);
checkpanel.add(checkboxes[b]);
tf[b] = new JTextField("", 9);
checkpanel.add(tf[b]);
tf[b].setFont(new Font("Serif", Font.PLAIN, 14));
}
contentPane.add(checkpanel);
layout.putConstraint(SpringLayout.EAST, checkpanel, -5, SpringLayout.EAST, contentPane);
layout.putConstraint(SpringLayout.SOUTH, checkpanel, -5, SpringLayout.SOUTH, contentPane);
}
private class HandlerClass implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
displayButton("Back");
displayButton("Next");
displayList(list1);
}
}
包源;
导入java.awt.*;
导入java.awt.event.*;
导入javax.swing.*;
导入javax.swing.event.*;
公共类Gui扩展JFrame
{
公共字符串[]列表1={“equation1”、“equation2”、“equation3”、“equation4”、“equation5”};
公共作业窗格opt1;
私服;
私有JTextField[]tf;
public HandlerClass2 itemhandler=new HandlerClass2();
私人名单;
私有静态int索引=0;
私有静态int lastlistindex=0;
私人JPanel按钮面板;
私有JPanel buttonpanel2[]=新JPanel[3];
私有JPanel listpanel[]=新JPanel[4];
私人JPanel检查小组;
专用JCheckBox复选框[];
私人空间布局;
公共容器内容窗格;
私人按钮,但;
公共图形用户界面()
{
超级(“物理助手v0.1”);
挫折背景(颜色:深灰色);
布局=新的SpringLayout();
contentPane=getContentPane();
contentPane.setLayout(布局);
displayPortal();
}
公共门户
{
图标a=新的图像图标(getClass().getResource(“button.png”);
图标b=新的图像图标(getClass().getResource(“button2.png”);
自定义=新的JButton(“,a”);
海关关长(b);
buttonpanel=新的JPanel();
按钮面板。挫折背景(颜色。灰色);
按钮面板。添加(自定义);
contentPane.add(buttonpanel);
布局.putConstraint(SpringLayout.WEST,buttonpanel,5,SpringLayout.WEST,contentPane);
布局.putConstraint(SpringLayout.EAST,buttonpanel,-5,SpringLayout.EAST,contentPane);
布局.putConstraint(SpringLayout.NORTH,buttonpanel,5,SpringLayout.NORTH,contentPane);
custom.addActionListener(新HandlerClass());
}
公共无效显示按钮(字符串s)
{
但是=新的按钮;
buttonpanel2[index]=新的JPanel();
按钮面板2[索引]。背景(颜色.灰色);
buttonpanel2[索引]。添加(但);
contentPane.add(buttonpanel2[index]);
layout.putConstraint(SpringLayout.SOUTH,buttonpanel2[index],-5,SpringLayout.SOUTH,contentPane);
如果(指数<1)
{
布局.putConstraint(SpringLayout.WEST,buttonpanel2[index],5,SpringLayout.WEST,contentPane);
}
其他的
{
布局.putConstraint(SpringLayout.WEST,buttonpanel2[index],5,SpringLayout.EAST,buttonpanel2[index-1]);
}
索引++;
}
公共void显示列表(字符串[]t)
{
列表=新JList(t);
list.setVisibleRowCount(8);
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
添加(新的JScrollPane(列表));
listpanel[lastlistindex]=新的JPanel();
listpanel[lastlistindex].setBackground(颜色.灰色);
listpanel[lastlistindex].add(列表);
add(listpanel[lastlistindex]);
layout.putConstraint(SpringLayout.NORTH,listpanel[lastlistindex],5,SpringLayout.SOUTH,buttonpanel);
if(lastlistindex<1)
{
layout.putConstraint(SpringLayout.WEST,listpanel[lastlistindex],5,SpringLayout.WEST,contentPane);
}
其他的
{
layout.putConstraint(SpringLayout.WEST,listpanel[lastlistindex],5,SpringLayout.EAST,listpanel[lastlistindex-1]);
}
lastlistindex++;
}
public void displayInputValues(字符串[]p)
{
复选框=新的JCheckBox[p.length];
GridLayout=新的GridLayout(p.长度,2);
tf=新的JTextField[p.length];
checkpanel=newjpanel();
检查面板。立根背景(颜色。灰色);
checkpanel.setLayout(网格布局);
for(intb=0;b
我的主要方法包含在另一个类中,效果很好
我的问题是如何在actionPerformed方法中调用“displayButton”方法?我已经尝试了一些技巧,比如用“Gui.this.displayButton”(“按我!”)调用它
我已经测试了代码的所有其他方面,这似乎是唯一的问题
我运行代码时没有收到错误 如果需要,我可以发布完整的类,但我认为问题在于尝试调用这些方法
你的看法是什么?调用该方法很好,不需要什么花哨的东西 您需要将
HandlerClass
的实例添加到GUI控件中,例如JButton
,单击该控件时将触发该方法。这就是ActionListeners
(以及一般侦听器)的要点。例如:
myJButton.addActionListener(new HandlerClass());
基于您的代码的工作示例:
public class Gui extends JFrame
{
public Gui()
{
super("Physics Helper v0.1");
JButton b = new JButton("Press me!");
b.addActionListener(new HandlerClass());
add(b);
pack();
setVisible(true);
}
public void displayButton(String s)
{
System.out.println(s);
}
private class HandlerClass implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
displayButton("Press me!");
}
}
public static void main(String[] args)
{
new Gui();
}
}
调用该方法很好,不需要任何花哨的东西 您需要将
HandlerClass
的实例添加到GUI控件中,例如JButton
,单击该控件时将触发该方法。这就是ActionListeners
(以及一般侦听器)的要点。例如:
myJButton.addActionListener(new HandlerClass());
基于您的代码的工作示例:
public class Gui extends JFrame
{
public Gui()
{
super("Physics Helper v0.1");
JButton b = new JButton("Press me!");
b.addActionListener(new HandlerClass());
add(b);
pack();
setVisible(true);
}
public void displayButton(String s)
{
System.out.println(s);
}
private class HandlerClass implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
displayButton("Press me!");
}
}
public static void main(String[] args)
{
new Gui();
}
}
快速脏选项是使displayButton调用为静态
那么问题更多的是设计问题,而不是其他问题。我建议你问问自己,为什么你希望你的动作监听器在拥有的对象中调用一个方法。快速而肮脏的选项是使displayButton调用静态