GUI编程
03 Swing
3.6 列表
- 下拉框
java
package com.duo.lesson06;
import javax.swing.*;
import java.awt.*;
public class ComboBoxDemo01 extends JFrame {
public ComboBoxDemo01() throws HeadlessException {
Container contentPane = getContentPane();
JComboBox<Object> objectJComboBox = new JComboBox<>();
objectJComboBox.addItem(null);
objectJComboBox.addItem("热映中");
objectJComboBox.addItem("即将上映");
objectJComboBox.addItem("已下架");
objectJComboBox.setFont(new Font("宋体", Font.BOLD, 20));
contentPane.add(objectJComboBox);
setTitle("下拉列表测试窗口");
setVisible(true);
setSize(350, 100);
setLocationRelativeTo(null);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new ComboBoxDemo01();
}
}
运行结果:
- 列表框
java
package com.duo.lesson06;
import javax.swing.*;
import java.awt.*;
import java.util.Vector;
public class ComboBoxDemo02 extends JFrame {
public ComboBoxDemo02() {
Container contentPane = getContentPane();
//先生成一个列表
String[] contents = {"One", "Two", "Three"};
//用于展示contents的列表框
JList<Object> objectJList1 = new JList<>(contents);
contentPane.add(objectJList1);
setTitle("列表框测试窗口");
setVisible(true);
setSize(650, 500);
setLocationRelativeTo(null);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new ComboBoxDemo02();
}
}
运行结果:
如图,列表框JList用于展示列表中的参数量。
列表的具体应用场景:
- 下拉列表:选择地区,或一些单个的选项
- 列表框:展示信息(可以自动动态扩容)
3.7 文本框
- 文本框
java
package com.duo.lesson06;
import javax.swing.*;
import java.awt.*;
public class TextDemo01 extends JFrame {
public TextDemo01() {
Container contentPane = getContentPane();
contentPane.setLayout(null); //设置为绝对布局
JTextField jTextField = new JTextField("Hello", 20);
jTextField.setBounds(20, 20, 100, 25);
JTextField jTextField2 = new JTextField("world", 20);
jTextField2.setBounds(20, 50, 100, 25);
contentPane.add(jTextField);
contentPane.add(jTextField2);
setTitle("文本框测试窗口");
setVisible(true);
setSize(650, 500);
setLocationRelativeTo(null);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new TextDemo01();
}
}
运行结果:
如上,此窗口面板设为了绝对布局。
- 密码框
java
package com.duo.lesson06;
import javax.swing.*;
import java.awt.*;
public class TextDemo02 extends JFrame {
public TextDemo02() {
Container contentPane = getContentPane();
JPasswordField jPasswordField = new JPasswordField(); //密码框文本域默认输入为小黑圆点
//jPasswordField.setEchoChar('*'); //同样可通过语句来设置输入文本后的显示样式为'*'
contentPane.add(jPasswordField);
setTitle("文本框测试窗口");
setVisible(true);
setSize(650, 500);
setLocationRelativeTo(null);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new TextDemo02();
}
}
运行结果:
- 文本域
java
package com.duo.lesson06;
import javax.swing.*;
import java.awt.*;
public class TextDemo03 extends JFrame {
public TextDemo03() {
Container contentPane = getContentPane();
contentPane.setLayout(null);
JTextArea jTextArea = new JTextArea("This is Schrodinger's channel.");
jTextArea.setFont(new Font("Times New Roman", Font.PLAIN, 22));
Dimension preferredSize = jTextArea.getPreferredSize(); //获得文本域的首选大小
jTextArea.setBounds((650 - preferredSize.width) / 2,
(500 - preferredSize.height) / 2 - preferredSize.height / 2,
preferredSize.width, preferredSize.height);
contentPane.add(jTextArea);
setTitle("文本域测试窗口");
setVisible(true);
setSize(650, 500);
setLocationRelativeTo(null);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new TextDemo03();
}
}
运行结果: