1、.setEditable(false); 设置文本域不可编辑
2、.setHorizontalAlignment(JTextField.CENTER); // 设置文本的水平对齐方式
有效值包括：
JTextField.LEFT 居左
JTextField.CENTER 居中
JTextField.RIGHT 靠右
JTextField.LEADING 靠左上
JTextField.TRAILING 靠右下
3、.setColumns(18); 设置此 TextArea 中的列数为18
4、.setVgap(10); 设置组件之间的垂直距离为10（int型）
5、.setHgap(10); 设置组件之间的水平距离为10（int型）
package Com.MySwing;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Toolkit;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder; public class EightSwing extends JFrame {
private static final long serialVersionUID = 8256394807443698879L;
private JPanel contentPane;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
EightSwing frame = new EightSwing();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public EightSwing() {
addWindowListener(new WindowAdapter() {
@Override
public void windowOpened(WindowEvent e) {
do_this_windowOpened(e);
}
});
setTitle("\u6839\u636E\u684C\u9762\u5927\u5C0F\u8C03\u6574\u7A97\u4F53\u5927\u5C0F");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
}
protected void do_this_windowOpened(WindowEvent e) {
Toolkit toolkit = getToolkit();// 获得窗体工具包
Dimension screenSize = toolkit.getScreenSize();// 获取屏幕大小
int width = (int) (screenSize.width * 0.8);// 计算窗体新宽度
int height = (int) (screenSize.height * 0.8);// 计算窗体新宽度
setSize(width, height);// 设置窗体大小
}
}