[英]How can I read a String array index from a JComboBox into a JLabel?
I have a ComboBox holding a String[]'s values. 我有一个ComboBox,其中保存String []的值。 I have several other String[]'s holding numbers.
我还有其他几个String []的保留编号。 I want the user to be able to select a item from the ComboBox(holding my String[] names) and according to which one they pick, I want that index associated with one of my other arrays to be printed out in a JLabel for display.
我希望用户能够从ComboBox中选择一个项目(保留我的String []名称),然后根据他们选择的项目,将与我的其他数组之一相关联的索引打印到JLabel中进行显示。 Here's what I have so far:
这是我到目前为止的内容:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class NewBuild extends JFrame
{
private static final int WIDTH = 900;
private static final int HEIGHT = 350;
//Create array constants
private static final String[] WARRIOR = {"7","6","6","5","15","11","5","5","5"};
private static final String[] KNIGHT = {"12","6","7","4","11","8","9","3","6"};
private static final String[] SWORDSMAN = {"4","8","4","6","9","16","6","7","5"};
private static final String[] BANDIT = {"9","7","11","2","9","14","3","1","8"};
private static final String[] CLERIC = {"10","3","8","10","11","5","4","4","12"};
private static final String[] SORCERER = {"5","6","5","12","3","7","8","14","4"};
private static final String[] EXPLORER = {"7","6","9","7","6","6","12","5","5"};
private static final String[] DEPRIVED = {"6","6","6","6","6","6","6","6","6"};
private static final String[] CLASS_NAMES = {" ", "Warrior", "Knight", "SwordsMan", "Bandit", "Cleric", "Sorcerer", "Explorer", "Deprived"};
private int num;
private int count = 0;
private String classes;
Container newBuildWindow = getContentPane();
private JLabel lblBuildName, lblStartingClass, lblDisplayStartingStats;
private JTextField txtBuildName;
private JComboBox cStartingClasses;
public NewBuild()
{
GUI();
}//End of Constructor
public void GUI()
{
this.setSize(WIDTH, HEIGHT);
newBuildWindow.setBackground(Color.DARK_GRAY);
setTitle("New Build");
setLayout(new GridLayout(5,2));
setVisible(true);
// setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
JPanel panel1 = new JPanel(new GridLayout());
JPanel panel2 = new JPanel(new GridLayout(2,3));
lblBuildName = new JLabel("Build Name");
lblBuildName.setForeground(Color.YELLOW);
panel1.setBackground(Color.DARK_GRAY);
panel1.add(lblBuildName);
txtBuildName = new JTextField(15);
txtBuildName.setBackground(Color.LIGHT_GRAY);
panel1.add(txtBuildName);
lblStartingClass = new JLabel("Pick a starting class:");
lblStartingClass.setForeground(Color.YELLOW);
lblDisplayStartingStats = new JLabel("Default");
lblDisplayStartingStats.setForeground(Color.YELLOW);
cStartingClasses = new JComboBox(CLASS_NAMES);
cStartingClasses.addItemListener(new itemChangeListener());
panel2.setBackground(Color.DARK_GRAY);
panel2.add(lblStartingClass);
panel2.add(cStartingClasses);
panel2.add(lblDisplayStartingStats);
//add panels to pane
newBuildWindow.add(panel1);
newBuildWindow.add(panel2);
// pack();
}//End of GUI method
class itemChangeListener implements ItemListener
{
@Override
public void itemStateChanged(ItemEvent e)
{
if(e.getStateChange() == ItemEvent.SELECTED)
{
}
}
}
}//End of class NewBuild
Any help would be very much appreciated...Please don't just post a solution, I want to understand the code not copy it. 任何帮助将不胜感激...请不要仅仅发布解决方案,我想了解代码而不是复制它。
First, create a "wrapper" class which can bind the String
values to a particular name (before anyone rushes at me says you can use a Map
of some kind, you could, but this "carries" the associated information within a neat package) 首先,创建一个“包装器”类,该类可以将
String
值绑定到特定名称(在有人冲我说可以使用某种Map
之前,可以,但是此“携带”相关信息在整齐的包中)
public class ClassType {
private String description;
private String[] values;
public ClassType(String description, String[] values) {
this.description = description;
this.values = values;
}
public String[] getValues() {
return values;
}
@Override
public String toString() {
return description;
}
}
Build an array of these ClassType
s and give this to the JComboBox
构建这些
ClassType
的数组,并将其提供给JComboBox
ClassType[] types = new ClassType[]{
new ClassType("Warrior", WARRIOR),
new ClassType("Knight", KNIGHT),
new ClassType("Swordsman", SWORDSMAN),
new ClassType("Bandit", BANDIT),
new ClassType("Cleric", CLERIC),
new ClassType("Socerer", SORCERER),
new ClassType("Explorer", EXPLORER),
new ClassType("Deprived", DEPRIVED)
};
cStartingClasses = new JComboBox(types);
And when the ItemListener
is notified, extract the values from the selected item... 并在通知
ItemListener
时,从所选项目中提取值...
@Override
public void itemStateChanged(ItemEvent e) {
if (e.getStateChange() == ItemEvent.SELECTED) {
ClassType classType = (ClassType) ((JComboBox)e.getSource()).getSelectedItem();
if (classType != null) {
String values[] = classType.getValues();
}
}
}
You can get the index and item as: 您可以通过以下方式获取索引和项目:
public void itemStateChanged(ItemEvent e)
{
if(e.getStateChange() == ItemEvent.SELECTED)
{
int index = cStartingClasses.getSelectedIndex();
String item = String.valueOf(cStartingClasses.getSelectedItem());
}
}
Here cStartingClasses
is JcomboBox
. 这里的
cStartingClasses
是JcomboBox
。
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