单项选择题 class Computation extends Thread {  private int num；  private boolean isComplete；  private int result；  public Computation（int num） { this.num = num； }  public synchronized void run（） {  result = num * 2；  isComplete = true；  notify（）；  }  public synchronized int getResult（） {  while （!isComplete） {  try {  wait（）；  } catch （InterruptedException e） { }  }  return result；  }  public static void main（String[] args） {  Computation[] computations = new Computation [4]；  for （int i = 0； i < computations.length； i++） {  computations[i] = new Computation（i）；  computations[i] .start（）；  }  for （Computation c ： computations）  System.out.print（c.getResult（） +“ “）；  }  }  What is the result？（）

多项选择题 public class Transfers {  public static void main（String[] args） throws Exception {  Record r1 = new Record（）；  Record r2 = new Record（）；  doTransfer（r1， r2， 5）；  doTransfer（r2， r1， 2）；  doTransfer（r1， r2， 1）；  // print the result  System.out.println（”rl = “ + r1.get（） +“， r2=” + r2.get（））；  }  private static void doTransfer（  final Record a， final Record b， final int amount） {  Thread t = new Thread（） {  public void run（） {  new Clerk（）.transfer（a， b， amount）；  }  }；  t.start（）；  }  }  class Clerk {  public synchronized void transfer（Record a， Record b， int amount）{  synchronized （a） {  synchronized （b） {  a.add（-amount）；  b.add（amount）；  }  }  }  }  class Record {  int num=10；  public int get（） { return num； }  public void add（int n） { num = num + n； }  }  If Transfers.main（） is run， which three are true？（）

单项选择题 public class TestSeven extends Thread {  private static int x；  public synchronized void doThings（） {  int current = x；  current++；  x = current；  }  public void run（） {  doThings（）；  }  }  Which is true？（）