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java - 如何根据复选框状态创建标签?

转载 作者:行者123 更新时间:2023-12-01 05:15:52 25 4
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我正在编写一个小程序来购买音乐。基本上它有 16 首歌曲,song1、song2、song3、song4 等作为复选框。用户应该能够选择他/她想要购买的歌曲,然后单击“添加到购物车”以显示购物车。根据上一屏幕中所做的检查,购物车应该有标签。

例如:如果选中歌曲 1、3 和 5,则购物车应显示三个标签 - 歌曲 1、3 和 5。

那么,如何根据检查创建标签,而不必事先创建 16 个标签,以免弄得一团糟?我应该以某种方式使用数组吗?

这有点复杂,因为我已经在卡片布局中创建了复选框。我编写了一个小程序(使用普通的旧记事本),其中带有单选按钮来选择流派。选择一个单选按钮会显示 4 首歌曲(这是我使用卡片的地方)。

   content_cat.setLayout(new BoxLayout(content_cat,                

BoxLayout.Y_AXIS));
content_cat.add(Box.createRigidArea(new Dimension(0,30)));
category_label = new JLabel("Select the category");
category_label.setAlignmentX(Component.CENTER_ALIGNMENT);
content_cat.add(category_label);
content_cat.add(Box.createRigidArea(new Dimension(0,30)));
pop = new JRadioButton("Pop");
pop.setAlignmentX(Component.LEFT_ALIGNMENT);
content_cat.add(pop);
content_cat.add(Box.createRigidArea(new Dimension(0,30)));
rock = new JRadioButton("Rock");
rock.setAlignmentX(Component.LEFT_ALIGNMENT);
content_cat.add(rock);
content_cat.add(Box.createRigidArea(new Dimension(0,30)));
jazz = new JRadioButton("Jazz");
jazz.setAlignmentX(Component.LEFT_ALIGNMENT);
content_cat.add(jazz);
content_cat.add(Box.createRigidArea(new Dimension(0,30)));
hiphop = new JRadioButton("Hip hop");
hiphop.setAlignmentX(Component.LEFT_ALIGNMENT);
content_cat.add(hiphop);
content_cat.add(Box.createRigidArea(new Dimension(0,30)));

group = new ButtonGroup();
group.add(pop);
group.add(rock);
group.add(jazz);
group.add(hiphop);

pop.addItemListener(this);
rock.addItemListener(this);
jazz.addItemListener(this);
hiphop.addItemListener(this);


//List Panel

content_list = new Panel();
gbc_content.gridx = 1;
gbc_content.gridy = 0;
gbc_content.weightx = 3;
gbc_content.weighty = 1;
gbc_content.fill = GridBagConstraints.BOTH;
content.add(content_list,gbc_content);

content_list.setLayout(new GridBagLayout());

//List Title Panel

list_title = new Panel();
gbc_list.gridx = 0;
gbc_list.gridy = 0;
gbc_list.weightx = 1;
gbc_list.weighty = 1;
gbc_list.fill = GridBagConstraints.BOTH;
content_list.add(list_title,gbc_list);
list_label = new JLabel("List of CD's Available");
list_title.add(list_label);

//List Cards Panel

list_card = new Panel();
list_card.setLayout(new CardLayout());
gbc_list.gridx = 0;
gbc_list.gridy = 1;
gbc_list.weightx = 1;
gbc_list.weighty = 4;
gbc_list.fill = GridBagConstraints.BOTH;
content_list.add(list_card,gbc_list);

//Pop card

card_pop = new Panel();
card_pop.setLayout(new BoxLayout(card_pop,

BoxLayout.Y_AXIS));
card_pop.add(Box.createRigidArea(new Dimension(0,30)));
pop1 = new JCheckBox("21 - Adele");
pop1.setAlignmentX(Component.LEFT_ALIGNMENT);
card_pop.add(pop1);
card_pop.add(Box.createRigidArea(new Dimension(0,30)));
pop2 = new JCheckBox("D'elles - Celine Dion");
pop2.setAlignmentX(Component.LEFT_ALIGNMENT);
card_pop.add(pop2);
card_pop.add(Box.createRigidArea(new Dimension(0,30)));
pop3 = new JCheckBox("Invincible - Michael Jackson");
pop3.setAlignmentX(Component.LEFT_ALIGNMENT);
card_pop.add(pop3);
card_pop.add(Box.createRigidArea(new Dimension(0,30)));
pop4 = new JCheckBox("Speak Now - Taylor Swift");
pop4.setAlignmentX(Component.LEFT_ALIGNMENT);
card_pop.add(pop4);
card_pop.add(Box.createRigidArea(new Dimension(0,30)));

//Rock card

card_rock = new Panel();
card_rock.setLayout(new BoxLayout(card_rock,

BoxLayout.Y_AXIS));
card_rock.add(Box.createRigidArea(new Dimension(0,30)));
rock1 = new JCheckBox("Let It Be - Beatles");
rock1.setAlignmentX(Component.LEFT_ALIGNMENT);
card_rock.add(rock1);
card_rock.add(Box.createRigidArea(new Dimension(0,30)));
rock2 = new JCheckBox("Viva la Vida - Coldplay");
rock2.setAlignmentX(Component.LEFT_ALIGNMENT);
card_rock.add(rock2);
card_rock.add(Box.createRigidArea(new Dimension(0,30)));
rock3 = new JCheckBox("Meteora - Linkin Park");
rock3.setAlignmentX(Component.LEFT_ALIGNMENT);
card_rock.add(rock3);
card_rock.add(Box.createRigidArea(new Dimension(0,30)));
rock4 = new JCheckBox("Dark Horse - Nickelback");
rock4.setAlignmentX(Component.LEFT_ALIGNMENT);
card_rock.add(rock4);

//Jazz card

card_jazz = new Panel();
card_jazz.setLayout(new BoxLayout(card_jazz,

BoxLayout.Y_AXIS));
card_jazz.add(Box.createRigidArea(new Dimension(0,30)));
jazz1 = new JCheckBox("Come Sing With Me - Frank Sinatra");
jazz1.setAlignmentX(Component.LEFT_ALIGNMENT);
card_jazz.add(jazz1);
card_jazz.add(Box.createRigidArea(new Dimension(0,30)));
jazz2 = new JCheckBox("Closer - Josh Groban");
jazz2.setAlignmentX(Component.LEFT_ALIGNMENT);
card_jazz.add(jazz2);
card_jazz.add(Box.createRigidArea(new Dimension(0,30)));
jazz3 = new JCheckBox("Little Broken Hearts - Norah Jones");
jazz3.setAlignmentX(Component.LEFT_ALIGNMENT);
card_jazz.add(jazz3);
card_jazz.add(Box.createRigidArea(new Dimension(0,30)));
jazz4 = new JCheckBox("Genius and Friends - Ray Charles");
jazz4.setAlignmentX(Component.LEFT_ALIGNMENT);
card_jazz.add(jazz4);
card_jazz.add(Box.createRigidArea(new Dimension(0,30)));

//Hiphop card

card_hiphop = new Panel();
card_hiphop.setLayout(new BoxLayout(card_hiphop,

BoxLayout.Y_AXIS));
card_hiphop.add(Box.createRigidArea(new Dimension(0,30)));
hiphop1 = new JCheckBox("Curtis - 50 Cent");
hiphop1.setAlignmentX(Component.LEFT_ALIGNMENT);
card_hiphop.add(hiphop1);
card_hiphop.add(Box.createRigidArea(new Dimension(0,30)));
hiphop2 = new JCheckBox("Freedom - Akon");
hiphop2.setAlignmentX(Component.LEFT_ALIGNMENT);
card_hiphop.add(hiphop2);
card_hiphop.add(Box.createRigidArea(new Dimension(0,30)));
hiphop3 = new JCheckBox("Relapse - Eminem");
hiphop3.setAlignmentX(Component.LEFT_ALIGNMENT);
card_hiphop.add(hiphop3);
card_hiphop.add(Box.createRigidArea(new Dimension(0,30)));
hiphop4 = new JCheckBox("Takin' Over");
hiphop4.setAlignmentX(Component.LEFT_ALIGNMENT);
card_hiphop.add(hiphop4);
card_hiphop.add(Box.createRigidArea(new Dimension(0,30)));

pop1.addItemListener(this);
pop2.addItemListener(this);
pop3.addItemListener(this);
pop4.addItemListener(this);

rock1.addItemListener(this);
rock2.addItemListener(this);
rock3.addItemListener(this);
rock4.addItemListener(this);

jazz1.addItemListener(this);
jazz2.addItemListener(this);
jazz3.addItemListener(this);
jazz4.addItemListener(this);

hiphop1.addItemListener(this);
hiphop2.addItemListener(this);
hiphop3.addItemListener(this);
hiphop4.addItemListener(this);

list_card.add(card_pop,POP);
list_card.add(card_rock,ROCK);
list_card.add(card_jazz, JAZZ);
list_card.add(card_hiphop, HIPHOP);

底部有一个“添加到购物车”按钮。单击时,它会打开一个带有购物车的新框架,这就是我想显示所选歌曲的地方。

这是事件处理代码

public void itemStateChanged(ItemEvent e)
{
CardLayout cl = (CardLayout)(list_card.getLayout());
if(e.getSource() == pop)
cl.show(list_card, POP);
if(e.getSource() == rock)
cl.show(list_card,ROCK);
if(e.getSource() == jazz)
cl.show(list_card, JAZZ);
if(e.getSource() == hiphop)
cl.show(list_card, HIPHOP);
}

public void actionPerformed(ActionEvent e)
{
if(e.getSource() == atc) //add to cart button
{
cart = new JFrame("Cart");
cart.setVisible(true);
}
}

基本上,使用 appletviewer 或网络浏览器打开小程序,选择每种流派所需的歌曲,单击“添加到购物车”以显示带有购物车的框架。

抱歉复制粘贴了这么多代码...

最佳答案

像这样怎么样:

创作歌曲:

ArrayList<String> songsSelection = new ArrayList();
ArrayList<Song> songs = new ArrayList();

//add all songs you want
songs.add( new Song(1, "Song 1"));
songs.add( new Song(1, "Song 1"));
songs.add( new Song(1, "Song 1"));

创建一个 Action 来识别选择,在这里您可以根据复选框状态删除或添加歌曲到选择

class SongAction implements ActionListener{
public void actionPerformed(ActionEvent e) {
JCheckBox temp = (JCheckBox)e.getSource();
if (temp.isSelected())
songsSelection.add(temp.getName());
else
songsSelection.remove(temp.getName());
updateCart();
}
}

创建复选框

for(Song s : songs){
JCheckBox cb = new JCheckBox(s.getName());
cb.addActionListener(new SongAction());
frame.add( cb );
}

现在您可以在选择后更新您的购物车

public void updateCart(){
panel.removeAll(); // clean the labels container
for(String name : songsSelection ){
panel.add(new JLable(name))
}
}

关于java - 如何根据复选框状态创建标签?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/11228103/

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