我制作了一个生成 ASCII 字符的 Java 程序。
如果您想尝试以下代码:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class asciiTable implements ActionListener {
private static JButton exebouton;
private JTextArea ecran = new JTextArea();
private JScrollPane scrollecran = new JScrollPane(ecran);
String line = "-------------";
public static void main(String[] args) {
new asciiTable();
}
private asciiTable() {
// Window
JFrame frame = new JFrame("Name");
frame.setBounds(400, 350, 625, 355);
frame.setLayout(null);
Container container = frame.getContentPane();
// Panel
JPanel panneau = new JPanel();
panneau.setLayout(null);
panneau.setBounds(2, 42, 146, 252);
frame.add(panneau);
JLabel nglabel = new JLabel("Click");
nglabel.setBounds(5, 0, 200, 20);
panneau.add(nglabel);
// Button
exebouton = new JButton("Execute");
exebouton.setBounds(4, 18, 138, 47);
exebouton.addActionListener(this);
panneau.add(exebouton);
// Text Area
ecran.setEditable(false);
ecran.setLineWrap(true);
scrollecran.setBounds(150, 42, 467, 252);
container.add(scrollecran);
// Show
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
@Override
public void actionPerformed(ActionEvent e) {
Object test = e.getSource();
ecran.setText(ecran.getText() + line + '\n'
+ "[ASCII TABLE]" + '\n'
+ line + '\n');
for (int i = 32, j = 0; i <= 800; i++, j++){ // WARNING: Big loop might lag your computer
String putzero = "";
if (i < 100){
putzero = "0";
}
if (j >= 5){
ecran.setText(ecran.getText() + "\n");
j = 0;
}
ecran.setText(ecran.getText() + "[" + putzero + i + "] " + Character.toString ((char) i) + "\t");
}
ecran.setText(ecran.getText() + "\n");
}
}
我的问题是:为什么 Java GUI 中的大循环会滞后或冻结我的计算机?有没有办法提高速度?