我有一个接受条目然后处理数据的GUI，但我希望能够显示队列中的条目，然后将它们显示在JList中。
我有使用JList和队列的GUI代码，但我不知道如何链接它们并使JList成为队列的表示。
GUI类：
public class ServerPlayergameMain extends javax.swing.JFrame implements Runnable {
public serverPlayerQueue serverQueue = new serverPlayerQueue();
Thread run;
public ServerPlayergameMain() {
initComponents();
}
public void run(){
String commandMessage = command.getText();
serverQueue.addToQueue(commandMessage);
command.setText(" ");
repaint();
validate();
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
command = new javax.swing.JTextField();
jLabel1 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
jScrollPane1 = new javax.swing.JScrollPane();
jList1 = new javax.swing.JList();
jButton2 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
jLabel2 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setResizable(false);
command.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
commandActionPerformed(evt);
}
});
command.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyPressed(java.awt.event.KeyEvent evt) {
commandKeyPressed(evt);
}
});
jLabel1.setText("Enter your command:");
jButton1.setText("Go!");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jList1.setModel(new javax.swing.AbstractListModel() {
String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
public int getSize() { return strings.length; }
public Object getElementAt(int i) { return strings[i]; }
});
jScrollPane1.setViewportView(jList1);
jButton2.setText("Save");
jButton3.setText("Forfeit");
jLabel2.setText("Command Queue:");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(29, 29, 29)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jButton3)
.addGap(0, 0, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel1)
.addGap(0, 132, Short.MAX_VALUE))
.addComponent(command))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jButton2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jScrollPane1)
.addComponent(jLabel2, javax.swing.GroupLayout.DEFAULT_SIZE, 88, Short.MAX_VALUE)
.addComponent(jButton1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGap(38, 38, 38))))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(90, 90, 90)
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 253, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton2)
.addGap(18, 18, 18)
.addComponent(jButton1)
.addGap(0, 46, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(command, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(12, 12, 12)
.addComponent(jButton3)))
.addContainerGap())
);
pack();
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
run = new Thread(this);
run.start();
}
private javax.swing.JTextField command;
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JList jList1;
private javax.swing.JScrollPane jScrollPane1;
}
队列类：
public class serverPlayerQueue {
String [] elementArray = new String [20];
int frontPointer = 0;
int rearPointer = -1;
int arrayInput = 0;
char choice;
public void addToQueue (String command) {
if (arrayInput == 20) {
System.out.println("Error in queue!");
}else{
rearPointer = rearPointer+1;
rearPointer = rearPointer % 20;
elementArray[rearPointer] = command;
arrayInput++;
}
}
}
你可以帮我让JList从队列中获取数据，然后显示它吗？
感谢您的时间
答案 0 :(得分：1)
您有多种选择，但您选择哪一种将取决于其他因素......
更新队列时，只需在基础ListModel中添加或删除元素即可。这将要求您提供能够进行变异的ListModel，例如DefaultListModel。
这假设您正在事件调度线程的上下文中修改队列
设计一个由队列支持的包装器/代理类，并提供所需的基本功能（添加/删除），同时提供监听器支持。
通过这种方式，您可以在将队列中的元素添加或删除给有兴趣的各方时发出通知。
这允许在单独的线程中管理队列，并确保在侦听器本身内发生UI更新的责任
这基本上是Observer Pattern
的实现无论哪种方式，请查看How to Use Lists了解更多详情