(总结)Swing组件的使用---按钮(JButton),组合框(JComboBox),下拉列表(JList)和颜色选择器(JColorChooser)

public class JButtonExample3 extends JPanel implements ActionListener {

protected JButton b1, b2, b3;

public JButtonExample3() {

ImageIcon leftButtonIcon = createImageIcon("right.gif");
ImageIcon middleButtonIcon = createImageIcon("middle.gif");
ImageIcon rightButtonIcon = createImageIcon("left.gif");

b1 = new JButton("失效中间按钮(D)", leftButtonIcon);
b1.setVerticalTextPosition(AbstractButton.CENTER);// 水平中间对齐
b1.setHorizontalTextPosition(AbstractButton.LEADING);// 相当于LEFT
b1.setMnemonic(KeyEvent.VK_D);// 将b1邦定alt+D键
b1.setActionCommand("disable");

b2 = new JButton("M中间按钮", middleButtonIcon);
b2.setVerticalTextPosition(AbstractButton.BOTTOM);
b2.setHorizontalTextPosition(AbstractButton.CENTER);
b2.setMnemonic(KeyEvent.VK_M);// 将b2邦定alt+M键

b3 = new JButton("E激活中间按钮", rightButtonIcon);
b3.setMnemonic(KeyEvent.VK_E);// 将b3邦定alt+E键
b3.setActionCommand("enable");
b3.setEnabled(false);

// 给1和3添加事件监听
b1.addActionListener(this);
b3.addActionListener(this);

// 设置按钮提示文本
b1.setToolTipText("点击这个按钮，将使中间的按钮失效！");
b2.setToolTipText("点击这个按钮，没有任何的事件发生！");
b3.setToolTipText("点击这个按钮，将使中间的按钮有效");

// 将按钮添加到JPanel中
add(b1);
add(b2);
add(b3);
}

public void actionPerformed(ActionEvent e) {
if ("disable".equals(e.getActionCommand())) {
b2.setEnabled(false);
b1.setEnabled(false);
b3.setEnabled(true);
} else {
b2.setEnabled(true);
b1.setEnabled(true);
b3.setEnabled(false);
}
}

protected static ImageIcon createImageIcon(String path) {
java.net.URL imgURL = JButtonExample3.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn′t find file: " + path);
return null;
}
}

public static void main(String[] args) {
// 设置使用新的swing界面
//提供一个关于新创建的 JFrame 是否应该具有当前外观为其提供的 Window 装饰（如边框、关闭窗口的小部件、标题等等）的提示。
JFrame.setDefaultLookAndFeelDecorated(true);
// 创建一个窗体
JFrame frame = new JFrame("小龙按钮");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// 创建一个面板
JButtonExample3 newContentPane = new JButtonExample3();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
// 显示窗体
frame.pack();
frame.setLocation(300, 200);
frame.setVisible(true);
}
}

import java.awt.*; /* 包含用于创建用户界面和绘制图形图像的所有类。 */
import javax.swing.*; /* 提供一组"轻量级"组件，尽量让这些组件在所有平台上的工作方式都相同 */

public class JComboBoxDemo extends JFrame {

public JComboBoxDemo() {
/*
* Container是所有容器的父类,又是Java语言的组件类Component的子类. 容器是一种具有容纳其他组件和容器的功能的组件
* 一个Java的图形用户界面的最基本元素是组件,组件是可以以图形化的方式显示在屏幕上并能与用户进行交互的对象,如一个按钮,一个文本框等.
* 在Java中,通常将组件放在一定的容器内使用 this.getContentPane()方法返回此窗体的 contentPane 对象
*/
Container contentPane = this.getContentPane();

/* 创建一个面板对象,指定布局管理器为GridLayout,1行2列.Jpanel的默认版面管理为FlowLayout */
JPanel jPanel1 = new JPanel(new GridLayout(1, 2));

// 利用String数组建立JComboBox
String[] fruit = { "苹果", "香蕉", "桔子", "梨", "芒果" };
JComboBox jComboBox1 = new JComboBox(fruit);
jComboBox1.addItem("其他"); // 在列表框选项的最后再添加一个"其他"选项

// 设置jList1对象的带标题边框
jComboBox1.setBorder(BorderFactory.createTitledBorder("您最喜欢的水果:"));
// 添加列表框jComboBox1至面板
jPanel1.add(jComboBox1);

// 利用ComboBoxModel建立JComboBox
ComboBoxModel myModel = new MyModel();
JComboBox jComboBox2 = new JComboBox(myModel);
// 设置jList1对象的带标题边框
jComboBox2.setBorder(BorderFactory.createTitledBorder("您最喜欢的水果:"));
// 添加列表框jComboBox2至面板
jPanel1.add(jComboBox2);

// 添加面板至父容器
contentPane.add(jPanel1);
// 设置本窗体的标题
this.setTitle("JComboBoxDemo");
// 设置本窗体显示的初始大小
this.setSize(350, 90);
this.setLocation(300, 200);
// 设置本窗体初始可见
this.setVisible(true);
}

class MyModel extends DefaultComboBoxModel {
String[] fruit = { "苹果", "香蕉", "桔子", "梨", "芒果" };

MyModel() {
for (int i = 0; i < fruit.length; i++) {
/* addElement()方法用于向列表框添加选项元素 */
this.addElement(fruit[i]);
}
}
}

public static void main(String args[]) {
JComboBoxDemo test = new JComboBoxDemo();
}
}

public class JListDemo1 extends JFrame{

Container contentPane;
JPanel jp;
JList jList1,jList2,jList3;

public JListDemo1(){

contentPane = this.getContentPane();

jp = new JPanel(new GridLayout(1,3));

//利用String数组建立JList对象
String[] fruit={"苹果","香蕉","桔子","梨","芒果"};
jList1=new JList(fruit);
//设置jList1对象的带标题边框
jList1.setBorder(BorderFactory.createTitledBorder("您最喜欢的水果: "));
//设置jList1对象的选择模式为单一选择
jList1.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
jp.add(jList1);

//利用ListModel建立JList对象,可实现列表内容的动态
ListModel myModel=new MyModel(); //创建一个列表模型对象
jList2=new JList(myModel); //根据列表模型对象创建列表
jList2.setBorder(BorderFactory.createTitledBorder("您最喜欢的水果: "));

//设置jList2对象的选择模式为按住[Ctrl]可多项选择
jList2.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
jp.add(jList2);

jList3=new JList(fruit);
jList3.setBorder(BorderFactory.createTitledBorder("您最喜欢的水果: "));
jList3.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
jList3.setVisibleRowCount(3);
jList3.setFixedCellWidth(120);
jList3.setFixedCellHeight(30);
JScrollPane jScrollPane = new JScrollPane(jList3);
jp.add(jScrollPane);

contentPane.add(jp);

this.setTitle("JListDemo");
this.setSize(340,200);
//pack();
this.setLocation(400, 300);
this.setVisible(true);
}

//通过继承DefaultListModel类可实现动态内容的列表选择
class MyModel extends DefaultListModel{

String[] fruit={"苹果","香蕉","桔子","梨","芒果"};

MyModel(){
for(int i=0;i<fruit.length;i++){
/* void addElement(Object obj)
* 将指定组件添加到此类表的末尾。*/
this.addElement(fruit[i]);
}
}
}

public static void main(String[] args){
JListDemo1 test=new JListDemo1();
}
}

public class JListDemo2 extends JFrame {

Container contentPane;
JPanel jp;
JList jListFont, jListSize;

// 构造函数
public JListDemo2() {

contentPane = this.getContentPane();
jp = new JPanel(new GridLayout());

setJListFont();
setJListFontSize();

contentPane.add(jp);

this.setTitle("JListDemo");
this.setSize(240, 200);
this.setLocation(400, 300);
this.setVisible(true);

} // End of JListDemo2

public void setJListFont() {
GraphicsEnvironment ge = GraphicsEnvironment
.getLocalGraphicsEnvironment();
final String fontName[] = ge.getAvailableFontFamilyNames(); // 获取系统的本地字体

jListFont = new JList(fontName);

// 设置jList1对象的带标题边框
jListFont.setBorder(BorderFactory.createTitledBorder("系统字体: "));
// 设置jList1对象的选择模式为单一选择
jListFont.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
jListFont.setVisibleRowCount(3);
jListFont.setFixedCellWidth(120);
jListFont.setFixedCellHeight(20);

JScrollPane jScrollPane1 = new JScrollPane(jListFont);
jp.add(jScrollPane1);
}
public void setJListFontSize() {
final String fontSize[] = { "8", "9", "10", "12", "14", "15", "16",
"18", "20", "21", "22", "24", "26", "28", "30", "36", "48",
"54", "72", "89" };
// 创建字号的列表框listSize
jListSize = new JList(fontSize);
jListSize.setBorder(BorderFactory.createTitledBorder("字体大小: "));
// 设置jList2对象的选择模式为按住[Ctrl]可多项选择
jListSize
.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
jListSize.setVisibleRowCount(3);
jListSize.setFixedCellWidth(120);
jListSize.setFixedCellHeight(20);

JScrollPane jScrollPane2 = new JScrollPane(jListSize);
jp.add(jScrollPane2);
}

public static void main(String[] args) {
JListDemo2 test = new JListDemo2();
}
}

public class JColorChooserDemo {

public static void main(String[] args) {

JFrame frame = new JFrame("JColorChooserDemo");

MyPanel panel = new MyPanel();
frame.getContentPane().add(panel);

frame.pack();
frame.setLocation(300, 200);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}

class MyPanel extends JPanel implements ActionListener {

private static final long serialVersionUID = 1L;
private JButton button,rgb,red,green,blue;
private Color color = new Color(255, 51, 150);

public MyPanel() {

button = new JButton("Get Color");
rgb = new JButton("RGB: ");
red = new JButton("Red: ");
green = new JButton("Green: ");
blue = new JButton("Blue: ");
button.addActionListener(this);

setPreferredSize(new Dimension(550, 250));
setLayout(new FlowLayout(FlowLayout.CENTER, 5, 5));
setBackground(color);
add(button);
add(rgb);
add(red);
add(green);
add(blue);
}

public void actionPerformed(ActionEvent e) {

color = JColorChooser.showDialog(this, "Choose Color", color);

if (color != null) {
setBackground(color);
button.setText("Get again");
rgb.setText("RGB: " + color.getRGB());
red.setText("Red: " + color.getRed());
green.setText("Green: " + color.getGreen());
blue.setText("Blue: " + color.getBlue());
}
}
}

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ColorChooserDemo1 extends MouseAdapter {

JFrame f = null;
JLabel label = null;
JLabel label1 = null;
JLabel label2 = null;
Rectangle rec1 = null;
Rectangle rec2 = null;

public ColorChooserDemo1() {

f = new JFrame("ColorChooser Example");
Container contentPane = f.getContentPane();
contentPane.addMouseListener(this);

label = new JLabel(" ", JLabel.CENTER);
label.setPreferredSize(new Dimension(300, 20));

JPanel panel = new JPanel();
panel.setLayout(new GridLayout(1, 2));

label1 = new JLabel("左Label", JLabel.CENTER);
label1.setBackground(Color.red);
label1.setForeground(Color.black);
label1.setOpaque(true);
label1.setBounds(0, 0, 150, 150);
panel.add(label1);

label2 = new JLabel("右Label", JLabel.CENTER);
label2.setBackground(Color.green);
label2.setForeground(Color.black);
label2.setOpaque(true);
label2.setBounds(150, 0, 150, 150);
panel.add(label2);

rec1 = label1.getBounds();
rec2 = label2.getBounds();

contentPane.add(panel, BorderLayout.CENTER);
contentPane.add(label, BorderLayout.SOUTH);

f.setSize(new Dimension(300, 150));
f.setVisible(true);

f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}

// 实现MouseAdapter中的mousePressed()与mouseClicked()方法.当按下鼠标时,就能知道鼠标光标目前的位置.当连续键击鼠标
// 两次时,若光标所在位置在label中,就会出现颜色选择对话框,用户可选择任一颜色更改label的颜色.
public void mousePressed(MouseEvent e) {
label.setText("目前鼠标坐标（X,Y）为：（" + e.getX() + "," + e.getY() + ")");
}

public void mouseClicked(MouseEvent e) {
Point point = e.getPoint();

if (e.getClickCount() == 2) {
if (rec1.contains(point)) {
/*
* 利用JColorChooser的showDialog()静态方法输出颜色选择对话框
* ,showDialog()中的3个参数依次是: 对话框的父组件,颜色选择对话框标题
* ,与对话框默认颜色.当用户选择完颜色之后,按下"OK"按钮则返回
* Color对象,若按下"Cancel"按钮则返回null值.
*/
Color color = JColorChooser.showDialog(f,
"Change label1 Color", Color.white);
if (color != null) // 若为null值表示用户按下Cancel按钮
label1.setBackground(color);
}
if (rec2.contains(point)) {
Color color = JColorChooser.showDialog(f,
"Change label2 Color", Color.yellow);
if (color != null) // 若为null值表示用户按下Cancel按钮
label2.setBackground(color);
}
}
}

public static void main(String[] arg) {
new ColorChooserDemo1();
}
}