java - 如何检查调用者是否完成

Question

在下面的代码中，我想在 invokeLater 完成后做一些事情。1）由于调度程序调用了setModel，我无法使用invokeAndWait。2）我不能改变线程内最终变量的值！那么我该如何等待 involeLater 先完成呢？

 boolean isDone=false;
 SwingUtilities.invokeLater(new Runnable(){public void run(){
    setModel(new DefaultTableModel(oRecordTable, sIP_TABLE_COL_NAMES_LIST));
    isDone = true; // CAN NOT BE CHANGED HERE, AS HAS TO BE FINAL
 }});
 while (!idDone){
 //wait
 }
 // do something here after the invokeLater is done

Answer 1

您可以使用 CountDownLatch 来做到这一点。但这与使用 invokeAndWait() 完全相同，阻塞当前线程，因此没有任何意义。

正确的：

SwingUtilities.invokeLater(new Runnable(){public void run(){
    setModel(new DefaultTableModel(oRecordTable, sIP_TABLE_COL_NAMES_LIST));
    isDone = true; // CAN NOT BE CHANGED HERE, AS HAS TO BE FINAL

    // do something here after the invokeLater is done <=====

 }});

CountDownLatch（没用，见上）

final CountDownLatch latch = new CountDownLatch(1);

SwingUtilities.invokeLater(new Runnable(){public void run(){
    setModel(new DefaultTableModel(oRecordTable, sIP_TABLE_COL_NAMES_LIST));
    isDone = true; // CAN NOT BE CHANGED HERE, AS HAS TO BE FINAL

    latch.countDown();

 }});

latch.await(); // could use invokeAndWait as well if blocking thread here ..