我有这样的代码:进口java.util.concurrent.ExecutorService;进口java.util.concurrent.Executors;
class Sum implements Runnable{
private int a, b;
public Sum(int a, int b){
this.a = a;
this.b = b;
}
public void run(){
System.out.printf("a + b = %dt", a+b);
}
}
class Multiply implements Runnable{
private int a, b;
public Multiply(int a, int b){
this.a = a;
this.b = b;
}
public void run(){
System.out.printf("a * b = %dt", a*b);
}
}
public class HelloWorld{
public static void main(String []args){
ExecutorService executor = Executors.newFixedThreadPool(2);
for (int i = 0; i < 10; i++) {
Runnable worker1 = new Sum(2, 3);
Runnable worker2 = new Multiply(2, 3);
executor.execute(worker1);
executor.execute(worker2);
}
executor.shutdown();
}
}
如果,我用一些文本处理操作替换sum,并与gui的一些更新相乘,就像一个短语是可以的,我想立即更新gui,这是在gui应用程序中使用线程的正确方法吗?
您可以使用线程,但是任何对SWT控件的访问必须在单个用户界面线程上完成。
您可以使用Display.asyncExec
(或syncExec
)从另一个线程执行此操作,例如:
Display.getDefault().asyncExec(new Runnable() {
public void run() {
// TODO code to change a control
}
});
如果你试图访问后台线程中的SWT控件,你会得到一个'Invalid thread access'错误。