Java:等待线程结果没有阻塞UI? [英] Java: wait for thread result without blocking UI?
问题描述
让我在提出问题之前发布一些代码。
Let me post some code before I ask question.
public Object returnSomeResult() {
Object o = new Object();
Thread thread = new Thread(this);
thread.start();
return o;
}
public void run() {
// Modify o.
}
所以,方法 returnSomeResult
从UI线程调用;它启动另一个线程。现在,我需要等待,直到线程完成计算。同时,我不想阻止UI线程。如果我改变代码如下; UI线程被阻止。
So, the method returnSomeResult
is called from UI thread; which starts another thread. Now, I need to wait until the thread finishes the calculation. And, meanwhile, I do not want to block UI thread. If I change code as below; the UI thread gets blocked.
public Object returnSomeResult() {
Object o = new Object();
Thread thread = new Thread(this);
thread.start();
try {
synchronized(this) {
wait();
}
catch(Exception e) {
}
return o;
}
public void run() {
// Modify o.
try {
synchronized(this) {
notify();
}
catch(Exception e) {
}
}
$ b b
我相信因为我使用 synchronized(this)
,它导致UI线程阻塞。我可以使用
I am sure because I am using synchronized(this)
, it causing UI thread to block. How do i so this without blocking the UI thread ?
推荐答案
.oracle.com / javase / 6 / docs / api / javax / swing / SwingWorker.htmlrel =nofollow> swingworker
you can use the swingworker
public SwingWorker<Object,Void> returnSomeResult() {
SwingWorker<Object,Void> w = new SwingWorker(){
protected Void doInBackground(){
Object o;
//compute o in background thread
return o;
}
protected void done(){
Object o=get();
//do something with o in the event thread
}
}
w.execute();
return w;//if you want to do something with it
}
您可以根据调用者
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