首先抱歉我的英语。我正在尝试构建一个程序，通过JOptionPane.showInputDialog()获取用户的输入并将其存储在HashMap<String, Integer>中。
我做到了并且有效。
但问题是我想在swing组件（HashMap或JList或其他内容）中打印所有JTable键和值，但我不知道是哪个更好，更简单易用。
你有什么建议吗？
Masud 感谢您的回复，但我尝试了您的代码并且它给了我一个错误：
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0 >= 0
at java.util.Vector.elementAt(Unknown Source)
at javax.swing.table.DefaultTableModel.setValueAt(Unknown Source)
at javax.swing.JTable.setValueAt(Unknown Source)
at Main.viewAll(Main.java:91)
at Main$1.actionPerformed(Main.java:43)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
在错误中：第91行是我在for循环中写table.setValueAt(entry.getKey(), row, 0);的地方。第43行是我调用for循环的方法。
我试着解决它，但我什么都没解决。我刚看到当我使用HashMap给出的输入打印JOptionPane.showInputDialog()时出现此错误。如果我在代码中设置HashMap键和值，它就能完美运行。有什么想法解决它？
这是代码：
import java.awt.Container;
public class Main扩展JFrame {
static JTable table;
static JButton viewall, add, cercanome, cercamedia, esci;
static Map<String, Integer> registro = new HashMap<String, Integer>();
public static void main(String[] args) {
JFrame f = new JFrame("Studenti");
f.setSize(557, 597);
f.setResizable(false);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setLocationRelativeTo(null);
components(f.getContentPane());
}
public static void components(Container pane) {
// Here i set all the components of the frame and i set up the ActionListeners for the buttons
pane.setLayout(null);
table = new JTable(registro.size(), 2);
table.setBounds(10, 11, 384, 536);
pane.add(table);
viewall = new JButton("Visualizza Tutto");
viewall.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
viewAll();
}
});
viewall.setBounds(404, 11, 130, 23);
pane.add(viewall);
add = new JButton("Aggiungi Alunno");
add.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
addStudent();
}
});
add.setBounds(404, 45, 130, 23);
pane.add(add);
cercanome = new JButton("Cerca per Nome");
cercanome.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cercaNome();
}
});
cercanome.setBounds(404, 79, 130, 23);
pane.add(cercanome);
cercamedia = new JButton("Cerca per Media");
cercamedia.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cercaMedia();
}
});
cercamedia.setBounds(404, 113, 130, 23);
pane.add(cercamedia);
esci = new JButton("Esci");
esci.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
esci.setBounds(404, 147, 130, 23);
pane.add(esci);
}
public static void viewAll() { // This is called when you press the button "viewall" to print the map.
int row = 0;
for(Map.Entry<String, Integer> entry : registro.entrySet()){
table.setValueAt(entry.getKey(), row, 0);
table.setValueAt(entry.getValue(), row, 1);
row++;
}
}
public static void addStudent() { // This is called when you click the button "add" to add elements to the map.
registro.put(
JOptionPane
.showInputDialog("Inserire Nome e Cognome del nuovo studente:"),
Integer.parseInt(JOptionPane
.showInputDialog("Inserire la Media del nuovo studente:")));
}
// These are two methods that are called pressing other two buttons. But it doesn't matter.
public static void cercaNome() {}
public static void cercaMedia() {}
}
答案 0 :(得分：3)
您可以使用JTable，其中第一列将存储密钥，第二列将存储值。
Map<String,Integer> map=new HashMap<>();
map.put("A",1);
map.put("B",2);
map.put("C",3);
JTable table=new JTable(map.size(),2);
int row=0;
for(Map.Entry<String,Integer> entry: map.entrySet()){
table.setValueAt(entry.getKey(),row,0);
table.setValueAt(entry.getValue(),row,1);
row++;
}