对象数组到 JList 和 JList 到 JPanel
Array of Objects to JList and JList to JPanel
我有以下两个 类 其基本目的是创建一个对象数组...
class MovieInfo
{ private String movieTitle;
private String movieRating;
private String movieImg;
private String movieShowTimes;
private static double adultPrice;
private static double childPrice;
MovieInfo(String title, String rating, String img, String showTimes)
{
movieTitle = title;
movieRating = rating;
movieImg = img;
movieShowTimes = showTimes;
}
/*....sets gets methods.... */
}
///////////////////////////////
class MovieList
{
MovieInfo[] mList;
public void createList()
{
mList = new MovieInfo[22];
mList[0] = new MovieInfo("A United Kingdom","PG","A_United_Kingdom.jpg","yyyn");
mList[1] = new MovieInfo("Amitiville The Awakening","18A","AmitivilleAwakening.jpg","yyyn");
mList[2] = new MovieInfo("Arrival","14A","arrival.jpg","yyyy");
mList[3] = new MovieInfo("Baywatch","14A","baywatch.jpg","yyyy");
mList[4] = new MovieInfo("Beauty and the Beast","PG","Beauty_and_the_Beast.jpg","yyyn");
}
}
我还有附加到 JPanel 和单选按钮的 JList..
我的问题是,当我单击第一个 rbutton 时,我无法在这个 JList 上显示 mList[0] 中的电影名称,当我单击第二个 rbutton 时,我无法从 mList[1] 中显示电影名称,等等....
是的,我知道我需要为我的 rbuttons 注册侦听器并将它们分组并添加 ItemStateChange(只是不想在这里添加太多代码)...我在这里询问 [=] 行之后的逻辑12=]
if(e.getSource() instanceof JRadioButton)
{
请帮忙!任何想法将不胜感激!
您可以编写自定义 CellRenderer,如 docs 所示。
例如,有一个 Movie
bean 和一个扩展 DefaultListCellRenderer
的 MoviesListCellRenderer
你可能会得到这样的结果:
public class JListCards {
private JFrame frame;
private JPanel radiosPane;
private JRadioButton[] radios;
private String[] radiosNames = {"Movie", "Classification", "Price"};
private JList <Movie> moviesList;
private ButtonGroup group;
private Movie[] movies = new Movie[] {
new Movie("Happy Feet", "AA", 10),
new Movie("Star Wars", "B12", 15),
new Movie("Logan", "C", 20)
};
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> new JListCards().createAndShowGui());
}
public void createAndShowGui() {
frame = new JFrame(getClass().getSimpleName());
radiosPane = new JPanel(new GridLayout(1, 3));
radios = new JRadioButton[3];
group = new ButtonGroup();
for (int i = 0; i < radios.length; i++) {
radios[i] = new JRadioButton(radiosNames[i]);
radios[i].addActionListener(listener);
radiosPane.add(radios[i]);
group.add(radios[i]);
}
radios[0].setSelected(true);
moviesList = new JList<Movie>(movies);
moviesList.setCellRenderer(new MoviesListCellRenderer(0));
frame.add(moviesList);
frame.add(radiosPane, BorderLayout.SOUTH);
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
ActionListener listener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
for (int i = 0; i < radios.length; i++) {
if (e.getSource().equals(radios[i])) {
moviesList.setCellRenderer(new MoviesListCellRenderer(i));
break;
}
}
}
};
class MoviesListCellRenderer extends DefaultListCellRenderer {
private int attribute;
public MoviesListCellRenderer(int attribute) {
this.attribute = attribute;
}
@Override
public Component getListCellRendererComponent(JList<?> list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
if (value instanceof Movie) {
Movie movie = (Movie) value;
switch (attribute) {
case 0:
setText(movie.getMovieName());
break;
case 1:
setText(movie.getClassification());
break;
default:
setText(String.valueOf(movie.getPrice()));
break;
}
}
return this;
}
}
class Movie {
private String movieName;
private String classification;
private double price;
public Movie(String movieName, String classification, double price) {
super();
this.movieName = movieName;
this.classification = classification;
this.price = price;
}
public String getMovieName() {
return movieName;
}
public void setMovieName(String movieName) {
this.movieName = movieName;
}
public String getClassification() {
return classification;
}
public void setClassification(String classification) {
this.classification = classification;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
}
}
如您所见,根据所选无线电更改单元格渲染器,此代码仍可改进,但应该给您一个想法:
我有以下两个 类 其基本目的是创建一个对象数组...
class MovieInfo
{ private String movieTitle;
private String movieRating;
private String movieImg;
private String movieShowTimes;
private static double adultPrice;
private static double childPrice;
MovieInfo(String title, String rating, String img, String showTimes)
{
movieTitle = title;
movieRating = rating;
movieImg = img;
movieShowTimes = showTimes;
}
/*....sets gets methods.... */
}
///////////////////////////////
class MovieList
{
MovieInfo[] mList;
public void createList()
{
mList = new MovieInfo[22];
mList[0] = new MovieInfo("A United Kingdom","PG","A_United_Kingdom.jpg","yyyn");
mList[1] = new MovieInfo("Amitiville The Awakening","18A","AmitivilleAwakening.jpg","yyyn");
mList[2] = new MovieInfo("Arrival","14A","arrival.jpg","yyyy");
mList[3] = new MovieInfo("Baywatch","14A","baywatch.jpg","yyyy");
mList[4] = new MovieInfo("Beauty and the Beast","PG","Beauty_and_the_Beast.jpg","yyyn");
}
}
我还有附加到 JPanel 和单选按钮的 JList.. 我的问题是,当我单击第一个 rbutton 时,我无法在这个 JList 上显示 mList[0] 中的电影名称,当我单击第二个 rbutton 时,我无法从 mList[1] 中显示电影名称,等等....
是的,我知道我需要为我的 rbuttons 注册侦听器并将它们分组并添加 ItemStateChange(只是不想在这里添加太多代码)...我在这里询问 [=] 行之后的逻辑12=]
if(e.getSource() instanceof JRadioButton)
{
请帮忙!任何想法将不胜感激!
您可以编写自定义 CellRenderer,如 docs 所示。
例如,有一个 Movie
bean 和一个扩展 DefaultListCellRenderer
的 MoviesListCellRenderer
你可能会得到这样的结果:
public class JListCards {
private JFrame frame;
private JPanel radiosPane;
private JRadioButton[] radios;
private String[] radiosNames = {"Movie", "Classification", "Price"};
private JList <Movie> moviesList;
private ButtonGroup group;
private Movie[] movies = new Movie[] {
new Movie("Happy Feet", "AA", 10),
new Movie("Star Wars", "B12", 15),
new Movie("Logan", "C", 20)
};
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> new JListCards().createAndShowGui());
}
public void createAndShowGui() {
frame = new JFrame(getClass().getSimpleName());
radiosPane = new JPanel(new GridLayout(1, 3));
radios = new JRadioButton[3];
group = new ButtonGroup();
for (int i = 0; i < radios.length; i++) {
radios[i] = new JRadioButton(radiosNames[i]);
radios[i].addActionListener(listener);
radiosPane.add(radios[i]);
group.add(radios[i]);
}
radios[0].setSelected(true);
moviesList = new JList<Movie>(movies);
moviesList.setCellRenderer(new MoviesListCellRenderer(0));
frame.add(moviesList);
frame.add(radiosPane, BorderLayout.SOUTH);
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
ActionListener listener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
for (int i = 0; i < radios.length; i++) {
if (e.getSource().equals(radios[i])) {
moviesList.setCellRenderer(new MoviesListCellRenderer(i));
break;
}
}
}
};
class MoviesListCellRenderer extends DefaultListCellRenderer {
private int attribute;
public MoviesListCellRenderer(int attribute) {
this.attribute = attribute;
}
@Override
public Component getListCellRendererComponent(JList<?> list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
if (value instanceof Movie) {
Movie movie = (Movie) value;
switch (attribute) {
case 0:
setText(movie.getMovieName());
break;
case 1:
setText(movie.getClassification());
break;
default:
setText(String.valueOf(movie.getPrice()));
break;
}
}
return this;
}
}
class Movie {
private String movieName;
private String classification;
private double price;
public Movie(String movieName, String classification, double price) {
super();
this.movieName = movieName;
this.classification = classification;
this.price = price;
}
public String getMovieName() {
return movieName;
}
public void setMovieName(String movieName) {
this.movieName = movieName;
}
public String getClassification() {
return classification;
}
public void setClassification(String classification) {
this.classification = classification;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
}
}
如您所见,根据所选无线电更改单元格渲染器,此代码仍可改进,但应该给您一个想法: