Java 如何在框架窗口中添加滚动窗格
我想在框架窗口或组合面板中添加滚动窗格 在代码下面，Java 如何在框架窗口中添加滚动窗格,java,arrays,jframe,window,jscrollpane,Java,Arrays,Jframe,Window,Jscrollpane,我想在框架窗口或组合面板中添加滚动窗格 在代码下面，guiFrame.add（滚动窗格）不工作，为什么不工作 如何将滚动窗格添加到comboPanel或GUI框架 import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ItemEvent; import java.awt.event.ItemListen
guiFrame.add（滚动窗格）import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class ExtraComboBox {
private int maxFields = 4; // The max number of fields allowed in the dialog
JComboBox fruits[] = new JComboBox[maxFields];
JPanel comboPanel;
JFrame guiFrame;
String[] valOptions3 = { "&" };
String[] valOptions2 = { "|->", "|=>" };
String[] valOptions1 = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
String[] valOptions0 = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
String[] fruitOptions1 = { "", "Delay1", "Delay2", "Delay3" };
JButton addField;
int count1 = 0;
JLabel dudel[] = new JLabel[maxFields];
JComboBox dude2[] = new JComboBox[maxFields];
String[] valOptions = { "Unknown", "0", "1" };
String[] s = { "a", "b", "c", "d", "e", "f", "g", "h", "i" };
private JLabel comboLbl;
public static void main(String[] args) {
new ExtraComboBox();
}
public ExtraComboBox() {
guiFrame = new JFrame();
// make sure the program exits when the frame closes
guiFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
guiFrame.setTitle("ComboBox GUI");
guiFrame.setSize(350, 350);
// The first JPanel contains a JLabel and JCombobox
comboPanel = new JPanel();
addField = new JButton("Add Field");
addField.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent event) {
if (event.getSource().equals(addField)) {
if (count1 < maxFields) {
comboLbl = new JLabel("Select a relation:");
fruits[count1] = new JComboBox<String>(fruitOptions1);
MyItemListener2 actionListener2 = new MyItemListener2(count1);
fruits[count1].addItemListener(actionListener2);
// System.out.println("HI: " + fruits[count1].getParent());
dude2[count1] = new JComboBox<String>();
System.out.println("ADD FIELDS: " + count1);
comboPanel.add(comboLbl);
comboPanel.add(fruits[count1]);
comboPanel.add(dude2[count1]);
guiFrame.validate();
guiFrame.repaint();
count1++;
} else {
System.out.println("You reached the maximum of 4 fields.");
}
}
}
});
comboPanel.setLayout(new BoxLayout(comboPanel, BoxLayout.Y_AXIS));
comboPanel.add(addField);
// The JFrame uses the BorderLayout layout manager.
// Put the two JPanels and JButton in different areas.
guiFrame.add(comboPanel, BorderLayout.NORTH);
// make sure the JFrame is visible
guiFrame.setVisible(true);
}
class MyItemListener2 implements ItemListener {
private int index;
public MyItemListener2(int pIndex) {
super();
index = pIndex;
}
// This method is called only if a new item has been selected.
public void itemStateChanged(ItemEvent evt) {
if (evt.getStateChange() == ItemEvent.SELECTED) {
// Item was just selected
System.out.println("COUNTER: " + index);
System.out.println(evt.getItem());
dude2[index].removeAllItems();
switch ((String) evt.getItem()) {
case "Delay1":
for (int i = 0; i < valOptions1.length; i++) {
dude2[index].addItem(valOptions1[i]); // dude1 = new JComboBox(valOptions1);
System.out.println(valOptions1[i]);
}
break;
case "Delay2":
for (int j = 0; j < valOptions2.length; j++) {
System.out.println(valOptions2[j]);
dude2[index].addItem(valOptions2[j]); // dude1 = new JComboBox(valOptions1);
}
break;
case "Delay3":
for (int j = 0; j < valOptions3.length; j++) {
System.out.println(valOptions3[j]);
dude2[index].addItem(valOptions3[j]); // dude1 = new JComboBox(valOptions1);
}
}
}
}
}
}
导入java.awt.BorderLayout；
导入java.awt.event.ActionEvent；
导入java.awt.event.ActionListener；
导入java.awt.event.ItemEvent；
导入java.awt.event.ItemListener；
导入javax.swing.BoxLayout；
导入javax.swing.JButton；
导入javax.swing.JComboBox；
导入javax.swing.JFrame；
导入javax.swing.JLabel；
导入javax.swing.JPanel；
公共类体外麻醉箱{
private int maxFields=4；//对话框中允许的最大字段数
JComboBox水果[]=新的JComboBox[maxFields]；
JPanel小组；
JFrame-guiFrame；
字符串[]valOptions3={“&”}；
字符串[]valOptions2={“|->”，“|=>”}；
字符串[]valOptions1={“0”、“1”、“2”、“3”、“4”、“5”、“6”、“7”、“8”、“9”}；
字符串[]valOptions0={“0”、“1”、“2”、“3”、“4”、“5”、“6”、“7”、“8”、“9”}；
字符串[]水果选项1={”、“Delay1”、“Delay2”、“Delay3”}；
JButton-addField；
int count1=0；
JLabel dudel[]=新JLabel[maxFields]；
JComboBox dude2[]=新的JComboBox[maxFields]；
字符串[]valOptions={“未知”、“0”、“1”}；
字符串[]s={“a”、“b”、“c”、“d”、“e”、“f”、“g”、“h”、“i”}；
私人JLabel comboLbl；
公共静态void main（字符串[]args）{
新的ExtraComboBox（）；
}
公共外OMBOX（）{
guiFrame=newjframe（）；
//确保框架关闭时程序退出
setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）；
setTitle（“组合框GUI”）；
guiFrame.setSize（350350）；
//第一个JPanel包含JLabel和JCombobox
comboPanel=newJPanel（）；
addField=新的JButton（“添加字段”）；
addField.addActionListener（新ActionListener（）{
@凌驾
已执行的公共无效操作（操作事件）{
if（event.getSource（）.equals（addField））{
if（count1import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class ExtraComboBox {
private int maxFields = 4; // The max number of fields allowed in the dialog
JComboBox fruits[] = new JComboBox[maxFields];
JPanel comboPanel;
JFrame guiFrame;
String[] valOptions3 = { "&" };
String[] valOptions2 = { "|->", "|=>" };
String[] valOptions1 = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
String[] valOptions0 = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" };
String[] fruitOptions1 = { "", "Delay1", "Delay2", "Delay3" };
JButton addField;
int count1 = 0;
JLabel dudel[] = new JLabel[maxFields];
JComboBox dude2[] = new JComboBox[maxFields];
String[] valOptions = { "Unknown", "0", "1" };
String[] s = { "a", "b", "c", "d", "e", "f", "g", "h", "i" };
private JLabel comboLbl;
public static void main(String[] args) {
new ExtraComboBox();
}
public ExtraComboBox() {
guiFrame = new JFrame();
// make sure the program exits when the frame closes
guiFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
guiFrame.setTitle("ComboBox GUI");
guiFrame.setSize(350, 350);
// The first JPanel contains a JLabel and JCombobox
comboPanel = new JPanel();
addField = new JButton("Add Field");
addField.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent event) {
if (event.getSource().equals(addField)) {
if (count1 < maxFields) {
comboLbl = new JLabel("Select a relation:");
fruits[count1] = new JComboBox<String>(fruitOptions1);
MyItemListener2 actionListener2 = new MyItemListener2(count1);
fruits[count1].addItemListener(actionListener2);
// System.out.println("HI: " + fruits[count1].getParent());
dude2[count1] = new JComboBox<String>();
System.out.println("ADD FIELDS: " + count1);
comboPanel.add(comboLbl);
comboPanel.add(fruits[count1]);
comboPanel.add(dude2[count1]);
guiFrame.validate();
guiFrame.repaint();
count1++;
} else {
System.out.println("You reached the maximum of 4 fields.");
}
}
}
});
comboPanel.setLayout(new BoxLayout(comboPanel, BoxLayout.Y_AXIS));
comboPanel.add(addField);
// The JFrame uses the BorderLayout layout manager.
// Put the two JPanels and JButton in different areas.
guiFrame.add(comboPanel, BorderLayout.NORTH);
// make sure the JFrame is visible
guiFrame.setVisible(true);
}
class MyItemListener2 implements ItemListener {
private int index;
public MyItemListener2(int pIndex) {
super();
index = pIndex;
}
// This method is called only if a new item has been selected.
public void itemStateChanged(ItemEvent evt) {
if (evt.getStateChange() == ItemEvent.SELECTED) {
// Item was just selected
System.out.println("COUNTER: " + index);
System.out.println(evt.getItem());
dude2[index].removeAllItems();
switch ((String) evt.getItem()) {
case "Delay1":
for (int i = 0; i < valOptions1.length; i++) {
dude2[index].addItem(valOptions1[i]); // dude1 = new JComboBox(valOptions1);
System.out.println(valOptions1[i]);
}
break;
case "Delay2":
for (int j = 0; j < valOptions2.length; j++) {
System.out.println(valOptions2[j]);
dude2[index].addItem(valOptions2[j]); // dude1 = new JComboBox(valOptions1);
}
break;
case "Delay3":
for (int j = 0; j < valOptions3.length; j++) {
System.out.println(valOptions3[j]);
dude2[index].addItem(valOptions3[j]); // dude1 = new JComboBox(valOptions1);
}
}
}
}
}
}
JScrollPaneJViewport//guiFrame.add(comboPanel, BorderLayout.NORTH);
JScrollPane scrollPane = new JScrollPane( comboPanel );
guiFrame.add(scrollPane, BorderLayout.CENTER);
最好将滚动窗格添加到中心，这样它将获得框架的所有可用空间 什么滚动窗格？你说“它不起作用”是什么意思？你期望它做什么，它会做什么？你把相框装在哪里？