我知道JList有帶有Stringand的構造函數DefaultListModel。我想找到一種將列表與enum類型一起使用的方法，例如JList<SomeEnum> jlist。有辦法實現這一點嗎？這是一個小的運行示例：import javax.swing.*;import java.awt.*;public class Example implements Runnable { private JPanel jPanel; private JFrame jFrame; private JList<Algorithm> diagnosisList; public static void main(String[] args) { EventQueue.invokeLater(new Example()); } @Override public void run() { jFrame = new JFrame(); jPanel = new JPanel(); jPanel.setLayout(new FlowLayout()); jFrame.getContentPane().add(jPanel); jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); jPanel.setPreferredSize(new Dimension(500, 300)); DefaultListModel defaultListModel = new DefaultListModel(); defaultListModel.add(0, "Decision Tree"); defaultListModel.add(1, "Random Forest"); diagnosisList = getJList(defaultListModel); jPanel.add(diagnosisList); jFrame.pack(); jFrame.setVisible(true); } // I want to use Algorithm enum for parameter instaed of DefaultListModel private JList<Algorithm> getJList(DefaultListModel algorithms) { JList<Algorithm> jlist = new JList<Algorithm>(algorithms); return jlist; } enum Algorithm { DECISION_TREE_CLASSIFIER_DIAGNOSTIC("Decision Tree Classifier (D)", "Diagnostic"), RANDOM_FOREST_DIAGNOSTIC("Random Forest (D)", "Diagnostic"), LOGISTIC_REGRESSION_DIAGNOSTIC("Logistic Regression (D)", "Diagnostic"), K_MEANS_DIAGNOSTIC("KMeans (D)", "Diagnostic"); private final String name; private final String type; Algorithm(final String name, final String type) { this.name = name; this.type = type; } @Override public String toString() { return name; } }}
1 回答
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您可以像任何其他數組一樣將 an 的值添加enum到 a 中。JList例如：
public class Example implements Runnable {
private JPanel jPanel;
private JFrame jFrame;
private JList<Algorithm> diagnosisList;
private DefaultListModel<Algorithm> model;
public static void main(String[] args) {
EventQueue.invokeLater(new Example());
}
@Override
public void run() {
jFrame = new JFrame();
jPanel = new JPanel();
jPanel.setLayout(new FlowLayout());
jFrame.getContentPane().add(jPanel);
jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
jPanel.setPreferredSize(new Dimension(500, 300));
model = new DefaultListModel<>();
diagnosisList = new JList<Algorithm>(model);
for (Algorithm a : Algorithm.values())
model.addElement(a);
jPanel.add(diagnosisList);
jFrame.pack();
jFrame.setVisible(true);
}
public static enum Algorithm {
BFS, DFS, A_STAR
}
}
如果您不喜歡它的渲染方式，您可以隨時添加自己的ListCellRenderer：
diagnosisList.setCellRenderer(new DefaultListCellRenderer() {
private static final long serialVersionUID = 1L;
@Override
public Component getListCellRendererComponent(JList<?> list, Object value, int index, boolean isSelected,
boolean cellHasFocus) {
JLabel renderer = (JLabel) super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
renderer.setText(renderer.getText().toLowerCase()); //something
return renderer;
}
});
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