3.Swing
3.1、視窗&面闆
代碼:
package com.edwin.lesson04;
import javax.swing.*;
import java.awt.*;
/**
* @author EdwinD
* @create 2020.08.19 上午 08:31
* @desc Swing
**/
public class JFrameDemo1 {
public static void main(String[] args) {
new JFrameDemo1().init();
}
// init()初始化。
public void init(){
JFrame jFrame = new JFrame("這是我們的JFrame視窗。");
jFrame.setVisible(true);
jFrame.setBackground(Color.BLUE);
jFrame.setBounds(377, 377, 277, 277);
// 設定文字。 JLabel
JLabel jLabel = new JLabel("Welcome to EdwinD's Way.");
jFrame.add(jLabel);
// 關閉事件
jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}
輸出:
框框2:标簽居中。
package com.edwin.lesson04;
import javax.swing.*;
import java.awt.*;
/**
* @author EdwinD
* @create 2020.08.19 上午 09:05
* @desc Swing
**/
public class JFrameDemo2 {
public static void main(String[] args) {
MyJFrame2 myJFrame2 = new MyJFrame2();
myJFrame2.setTitle("這是我們的JFrame視窗2.0");
myJFrame2.init();
}
}
class MyJFrame2 extends JFrame {
public void init(){
setBounds(377, 377, 277, 277);
setVisible(true);
JLabel jLabel = new JLabel("Welcome to EdwinD's Way-2.0.");
this.add(jLabel);
// label居中,設定水準對齊
jLabel.setHorizontalAlignment(SwingConstants.CENTER);
// 獲得一個容器,
Container contentPane = this.getContentPane();
contentPane.setBackground(new Color(77,77,77));
// 關閉事件
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}
輸出:
3.2、彈窗
代碼:
package com.edwin.lesson04;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
/**
* @author EdwinD
* @create 2020.08.19 上午 09:46
* @desc 彈窗
**/
//主視窗
public class DialogDemo1 extends JFrame {
public static void main(String[] args) {
new DialogDemo1();
}
public DialogDemo1() {
this.setVisible(true);
this.setBounds(277, 277, 577, 577);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
// JFrame 存放東西,容器
Container container = this.getContentPane();
// 絕對布局
container.setLayout(null);
// 按鈕
JButton jButton = new JButton("彈窗顯靈!");
jButton.setBounds(100, 100, 100, 70);
// 點選此按鈕,會有彈窗。
jButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// 彈窗
new MyDialogDemo();
}
});
container.add(jButton);
}
}
//彈窗
class MyDialogDemo extends JDialog {
public MyDialogDemo() {
this.setVisible(true);
this.setBackground(Color.BLACK);
this.setBounds(100, 100, 300, 200);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
Container contentPane = this.getContentPane();
contentPane.setLayout(null);
contentPane.add(new Label("跟着老秦學Java"));
}
}
輸出:
3.3、标簽
Label
圖示’s Icon
代碼:
package com.edwin.lesson04;
import javax.swing.*;
import java.awt.*;
/**
* @author EdwinD
* @create 2020.08.19 上午 10:48
* @desc 标簽。圖示需要實作類,Frame繼承等。
**/
public class IconDemo1 extends JFrame implements Icon {
private int width;
private int height;
public static void main(String[] args) {
new IconDemo1().init();
}
//無參構造
public IconDemo1() {
}
//有參構造
public IconDemo1(int width, int height) {
this.width = width;
this.height = height;
}
public void init() {
IconDemo1 iconDemo1 = new IconDemo1(17, 17);
JLabel label = new JLabel("icontest", iconDemo1, SwingConstants.CENTER);
Container container = getContentPane();
container.add(label);
this.setVisible(true);
this.setBounds(277, 277, 677, 677);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
@Override
public void paintIcon(Component c, Graphics g, int x, int y) {
g.fillOval(x, y, width, height);
}
@Override
public int getIconWidth() {
return this.width;
}
@Override
public int getIconHeight() {
return this.height;
}
}
輸出:
圖中的小點點,就是我們創造的圖示。
2.0
圖檔’s Icon
代碼:
package com.edwin.lesson04;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
/**
* @author EdwinD
* @create 2020.08.19 上午 11:17
* @desc 圖檔顯示
**/
public class ImageIconDemo extends JFrame{
public static void main(String[] args) {
new ImageIconDemo();
}
public ImageIconDemo() {
// 擷取圖檔的位址
URL url = ImageIconDemo.class.getResource("Study.jpg");
// label作為承載圖檔的載體。
JLabel label = new JLabel("圖檔旁邊的小标簽");
// 注意命名,不要和關鍵詞重合。
ImageIcon imageIcon = new ImageIcon(url);
label.setIcon(imageIcon);
label.setHorizontalAlignment(SwingConstants.CENTER);
Container container = getContentPane();
container.add(label);
setVisible(true);
setBounds(277, 277, 877, 877);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}
輸出:
注:
由于IDEA存在緩存機制,有可能在第一次的編譯過程中會出現空指針異常現象(ImageIcon imageIcon = new ImageIcon(url);),再更改了代碼後依舊是無法正常運轉,建議此時進行重新開機。!!!。!!!
3.4、面闆
JPanel
試用Scroll面闆,帶滾輪,可伸縮。
代碼:
package com.edwin.lesson05;
import javax.swing.*;
import java.awt.*;
/**
* @author EdwinD
* @create 2020.08.19 下午 05:29
* @desc
**/
public class JScrollDemo extends JFrame {
public static void main(String[] args) {
new JScrollDemo();
}
public JScrollDemo() {
Container container = this.getContentPane();
// 文本域
JTextArea textArea = new JTextArea();
textArea.setText("Welcome to EdwinD's Java way.It's really a long and hard way for us to go." +
"But we must hand on it and try our best to do.");
// Scroll面闆,帶滾輪,可伸縮。
JScrollPane scrollPane = new JScrollPane(textArea);
container.add(scrollPane);
this.setVisible(true);
this.setBounds(277, 277, 300, 300);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}
輸出:
3.5、按鈕
圖檔按鈕:
将按鈕的内容設定為一個圖檔,點選後是按鈕的效果:
package com.edwin.lesson05;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
/**
* @author EdwinD
* @create 2020.08.19 下午 05:47
* @desc 按鈕
**/
public class JButton1 extends JFrame {
public static void main(String[] args) {
new JButton1();
}
public JButton1() {
Container container = this.getContentPane();
// 将一個圖檔,變為圖示
URL url = JButton1.class.getResource("Study.jpg");
Icon icon = new ImageIcon(url);
// 把圖檔放在按鈕上
JButton button = new JButton();
button.setIcon(icon);
button.setToolTipText("圖檔按鈕");
// add
container.add(button);
this.setVisible(true);
this.setBounds(277, 277, 500, 500);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}
輸出:
- 單選按鈕
多個選項隻能選取一個,按組進行分類,一個組選出來一個。
代碼:
package com.edwin.lesson05;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
/**
* @author EdwinD
* @create 2020.08.19 下午 06:05
* @desc 單選框按鈕
**/
public class JButton2 extends JFrame {
public static void main(String[] args) {
new JButton2();
}
public JButton2() {
Container container = this.getContentPane();
// 單選框
JRadioButton radioButton1 = new JRadioButton("JRadioButton1");
JRadioButton radioButton2 = new JRadioButton("JRadioButton2");
JRadioButton radioButton3 = new JRadioButton("JRadioButton3");
// 由于單選框隻能選擇一個,是以說我們采取“分組”的方法,一個組内隻有一個可以被選中
ButtonGroup group = new ButtonGroup();
group.add(radioButton1);
group.add(radioButton2);
group.add(radioButton3);
container.add(radioButton1, BorderLayout.NORTH);
container.add(radioButton2, BorderLayout.CENTER);
container.add(radioButton3, BorderLayout.SOUTH);
this.setVisible(true);
this.setBounds(277, 277, 500, 500);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}
輸出:
- 複選按鈕
每個選項單獨成組,可以一次性選擇多個按鈕内容。
代碼:
package com.edwin.lesson05;
import javax.swing.*;
import java.awt.*;
/**
* @author EdwinD
* @create 2020.08.19 下午 06:10
* @desc 多選框
**/
public class JButton3 extends JFrame {
public static void main(String[] args) {
new JButton3();
}
public JButton3() {
Container container = this.getContentPane();
// 多選框
JCheckBox checkBox1 = new JCheckBox("checkBox1");
JCheckBox checkBox2 = new JCheckBox("checkBox2");
container.add(checkBox1, BorderLayout.NORTH);
container.add(checkBox2, BorderLayout.SOUTH);
this.setVisible(true);
this.setBounds(277, 277, 500, 500);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}
輸出:
3.6、清單
- 下拉框
代碼:
package com.edwin.lesson6;
import javax.swing.*;
import java.awt.*;
/**
* @author EdwinD
* @create 2020.08.19 下午 06:27
* @desc 下拉框
**/
public class TextCombobox1 extends JFrame {
public static void main(String[] args) {
new TextCombobox1();
}
public TextCombobox1() {
Container container = this.getContentPane();
JComboBox status = new JComboBox();
status.addItem("起始預設字");
status.addItem("正在熱映");
status.addItem("即将上映");
status.addItem("已下架");
container.add(status);
this.setVisible(true);
this.setBounds(277, 277, 500, 500);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}
輸出:
- 清單框
應用場景:
- 填寫資訊時選擇地區,或者一些單選項目。
- 展示清單資訊,一般是動态擴容的。
代碼:
package com.edwin.lesson6;
import javax.swing.*;
import java.awt.*;
import java.util.Vector;
/**
* @author EdwinD
* @create 2020.08.19 下午 06:27
* @desc 下拉框
**/
public class TextCombobox1 extends JFrame {
public static void main(String[] args) {
new TextCombobox1();
}
public TextCombobox1() {
Container container = this.getContentPane();
// 生成清單内容
String[] content = {"7", "77", "777"};
Vector vector = new Vector();
vector.add("Alita");
vector.add("Jack");
vector.add("Toney");
// 清單中需要放入的内容
JList jList1 = new JList(content);
JList jList2 = new JList(vector);
container.add(jList1);
container.add(jList2);
this.setVisible(true);
this.setBounds(277, 277, 500, 500);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}
輸出:
3.7、文本框
- 文本框
代碼:
package com.edwin.lesson6;
import javax.swing.*;
import java.awt.*;
/**
* @author EdwinD
* @create 2020.08.19 下午 07:15
* @desc 文本框
**/
public class TextText1 extends JFrame {
public static void main(String[] args) {
new TextText1();
}
public TextText1() {
Container container = this.getContentPane();
JTextField textField1 = new JTextField("Hello");
JTextField textField2 = new JTextField("World!",20);//規定最多20個字元。
container.add(textField1,BorderLayout.NORTH);
container.add(textField2,BorderLayout.SOUTH);
this.setVisible(true);
this.setBounds(277, 277, 500, 500);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}
輸出:
- 密碼框
代碼:
package com.edwin.lesson6;
import javax.swing.*;
import java.awt.*;
/**
* @author EdwinD
* @create 2020.08.19 下午 07:20
* @desc 密碼框
**/
public class TextPassword1 extends JFrame {
public static void main(String[] args) {
new TextPassword1();
}
public TextPassword1() {
Container container = this.getContentPane();
JPasswordField passwordField = new JPasswordField();
passwordField.setEchoChar('*');
container.add(passwordField);
this.setVisible(true);
this.setBounds(277, 277, 500, 500);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}
輸出:
- 文本域
同Lesson5裡面的文本域
代碼:
package com.edwin.lesson05;
import javax.swing.*;
import java.awt.*;
/**
* @author EdwinD
* @create 2020.08.19 下午 05:29
* @desc
**/
public class JScrollDemo extends JFrame {
public static void main(String[] args) {
new JScrollDemo();
}
public JScrollDemo() {
Container container = this.getContentPane();
// 文本域
JTextArea textArea = new JTextArea();
textArea.setText("Welcome to EdwinD's Java way.It's really a long and hard way for us to go." +
"But we must hand on it and try our best to do.");
// Scroll面闆
JScrollPane scrollPane = new JScrollPane(textArea);
container.add(scrollPane);
this.setVisible(true);
this.setBounds(277, 277, 300, 300);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
}
輸出:
路漫漫其修遠兮,吾将上下而求索。
參考文獻
《【狂神說Java】GUI程式設計入門到遊戲實戰》
視訊連結
2020.08.19