如何在 Java 中调用invokeLater() 方法?\
awtjavaobject oriented programmingprogrammingswing
invokeLater() 方法是 SwingUtilities 类的静态方法，可用于在 AWT事件调度线程中异步执行任务。SwingUtilities.invokeLater() 方法的工作方式与 SwingUtilities.invokeAndWait()类似，只不过它将请求放在事件队列上并立即返回。 invokeLater() 方法不会等待 target 引用的 Runnable 内的代码块执行。
语法
public static void invokeLater(Runnable target)
示例
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class InvokeLaterTest extends Object {
private static void print(String msg) {
String name = Thread.currentThread().getName();
System.out.println(name + ": " + msg);
}
public static void main(String[] args) {
final JLabel label= new JLabel("Initial text");
JPanel panel = new JPanel(new FlowLayout());
panel.add(label);
JFrame f = new JFrame("InvokeLater Test");
f.setContentPane(panel);
f.setSize(400, 300);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setLocationRelativeTo(null);
f.setVisible(true);
try {
print("sleeping for 5 seconds");
Thread.sleep(5000);
} catch(InterruptedException ie) {
print("interrupted while sleeping");
}
print("creating the code block for an event thread"); Runnable setTextRun = new Runnable() {
public void run() {
try {
Thread.sleep(100);
print("about to do setText()"); label.setText("New text");
} catch(Exception e) {
e.printStackTrace();
}
}
};
print("about to call invokeLater()");
SwingUtilities.invokeLater(setTextRun);
print("back from invokeLater()"); }
}
输出
main: sleeping for 5 seconds main: creating the code block for an event thread main: about to call invokeLater() main: back from invokeLater() AWT-EventQueue-0: about to do setText()
