我目前很困惑如何使用数组来完成分配。我浏览了论坛，很少用Google。我真的很感谢有人可以提供的任何建议。非常感谢你！：
为我的2组单选按钮以及字体大小和字体创建数组
删除对单个JRadioButton的所有引用（style1，style2，.... size1，size2等）。相反，必须使用数组值。修改完所有代码后，我只需要在一个地方更改程序即可更改大小的所有方面。例如，更改字体数组中的值应更改字体大小选项和显示该字体大小的标签。
JRadioButton数组的大小应直接与int和String数组的长度相关。因此，如果我有六种不同的尺寸可供选择，则阵列中应该有六个JRadioButton。
通过向样式数组添加两个其他字体样式来测试代码。
通过在大小数组中添加两个其他大小来测试代码。
您可能需要修改actionPerformed方法，使其与第5章中检查特定事件的JRadioButtons示例中的方法匹配。
因此，在我尚未初始化的两个数组中，我将它们的大小设置为7，以允许我再添加两个大小和两个字体。我对如何在actionListener中调用数组的索引感到困惑。使用单选按钮和数组的最佳教程是什么？
这是我当前的代码：
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class StyleArrays extends JPanel implements ActionListener
{
//declare the labels, panels, variables and radio buttons
private JLabel saying;
private JRadioButton style1, style2, style3, style4;
private JRadioButton size1, size2, size3, size4;
private JPanel top, right, left;
JRadioButton[] size = new JRadioButton[7];
JRadioButton[] font = new JRadioButton[7];
String[] fonts = {"Arial", "Thonburi", "Rockwell", "Century Gothic"};
int[] sizes = {18, 22, 26, 30};
//declare the variables used later in the code the set the font and style
//private String myFont = "Arial";
//private int size = 18;
//Constructor
//-----------------------------------------------------------------
public StyleArrays()
{
//set the layout of the Layouts panel that will contain all of the other panels
setLayout (new BorderLayout());
setBackground (Color.red);
//create the new panels that will go inside the Layouts panel
top= new JPanel();
right= new JPanel();
left= new JPanel();
saying = new JLabel ("Say it with style!");
// saying.setFont (new Font (myFont, Font.PLAIN, size));
//set the layout and color of the top panel, and add the saying
add(top, BorderLayout.NORTH);
top.setBackground (Color.yellow);
top.add(saying);
//create size radio buttons
size1 = new JRadioButton ("18", true);
size1.setBackground (Color.red);
size2 = new JRadioButton ("22");
size2.setBackground (Color.red);
size3 = new JRadioButton ("26");
size3.setBackground (Color.red);
size4 = new JRadioButton ("30");
size4.setBackground (Color.red);
//add listeners for each size buttons
size1.addActionListener (this);
size2.addActionListener (this);
size3.addActionListener (this);
size4.addActionListener (this);
//add these buttons to this button group
ButtonGroup group1 = new ButtonGroup();
group1.add (size1);
group1.add (size2);
group1.add (size3);
group1.add (size4);
//set the layout and color of the left panel
add(left, BorderLayout.WEST); //add the left panel to the border layout
left.setLayout (new BoxLayout (left, BoxLayout.Y_AXIS)); //set the layout of left to box layout
left.setBackground (Color.red); //set the color to red
//display the buttons on the panel
left.add (size1);
left.add (size2);
left.add (size3);
left.add (size4);
//This section deals with the panel that contains the STYLE information
add(right, BorderLayout.EAST); //add the right panel to the border layout
right.setLayout (new GridLayout (2, 2)); //set the layout of right panel to grid layout
right.setBackground (Color.red); // set the background color of the panel to red
//create style radio buttons
style1 = new JRadioButton ("Arial", true);
style1.setBackground (Color.red);
style2 = new JRadioButton ("Thonburi");
style2.setBackground (Color.red);
style3 = new JRadioButton ("Rockwell");
style3.setBackground (Color.red);
style4 = new JRadioButton ("Century Gothic");
style4.setBackground (Color.red);
//add listeners for each style button
style1.addActionListener (this);
style2.addActionListener (this);
style3.addActionListener (this);
style4.addActionListener (this);
//add these buttons to this button group
ButtonGroup group2 = new ButtonGroup();
group2.add (style1);
group2.add (style2);
group2.add (style3);
group2.add (style4);
//display the buttons on the panel
right.add (style1);
right.add (style2);
right.add (style3);
right.add (style4);
}
//*****************************************************************
// Represents the listener for both check boxes.
//*****************************************************************
//*****************************************************************
// Represents the listener for the radio buttons.
//*****************************************************************
public void actionPerformed (ActionEvent event)
{
Object source = event.getSource();
if (source == size1) //if the event is that the size1 button is selected
size = 18; //assign 18 to the variable
if (source == size2)
size = 22;
if (source == size3)
size = 26;
if (source == size4)
size = 30;
if (source == style1)
myFont = "Arial";
if (source == style2)
myFont = "Thonburi";
if (source == style3)
myFont = "Rockwell";
if (source == style4)
myFont = "Century Gothic";
saying.setFont (new Font (myFont, Font.PLAIN, size)); //display the saying with the current value of 'myFont' and 'style'
}
public static void main (String[] args)
{
JFrame frame = new JFrame ("Style Arrays");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
StyleArrays panel = new StyleArrays();
frame.getContentPane().add (panel);
frame.pack();
frame.setVisible(true);
}
}
最佳答案
您可以像这样从字体数组创建它们：
public class StylePanel extends JPanel implements ActionListener {
String[] fontArray = {"Arial", "Serif", "Courier", "Consolas"};
JLabel label;
JRadioButton[] fontButtons = new JRadioButton[fontArray.length];
ButtonGroup fontGroup = new ButtonGroup();
public StylePanel() {
setLayout(new FlowLayout());
label = new JLabel("Hello");
add(label);
for(int i = 0; i < fontButtons.length; i++) {
fontButtons[i] = new JRadioButton();
fontButtons[i].setText(fontArray[i]);
fontButtons[i].addActionListener(this);
fontGroup.add(fontButtons[i]);
add(fontButtons[i]);
}
}
@Override
public void actionPerformed(ActionEvent e) {
label.setFont(new Font(
((JRadioButton)e.getSource()).getText(), Font.PLAIN, 15));
}
public static void main(String[] args) {
StylePanel panel = new StylePanel();
JFrame frame = new JFrame();
frame.getContentPane().add(panel);
frame.setSize(400, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
与size数组相同的过程，我只是省略了它以使其简短。