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public class SyncTest{   public static void main(String args) {    final StringBuffer s1= new StringBuffer();    final StringBuffer s2= new StringBuffer();    new Thread () {    public void run() {   synchronized(s1) {   s2.append(“A”);   synchronized(s2) {    s2.append(“B”);    System.out.print(s1);    System.out.print(s2);   }   }    }    }.start();   new Thread() {   public void run() {   synchronized(s2) {  s2.append(“C”);  synchronized(s1) {   s1.append(“D”);  System.out.print(s2);  System.out.print(s1);   }   }    }   }.start();   }   }   Which two statements are true? ()

  • A、 The program prints “ABBCAD”
  • B、 The program prints “CDDACB”
  • C、 The program prints “ADCBADBC”
  • D、 The output is a non-deterministic point because of a possible deadlock condition.
  • E、 The output is dependent on the threading model of the system the program is running on.

参考答案

更多 “ public class SyncTest{   public static void main(String args) {    final StringBuffer s1= new StringBuffer();    final StringBuffer s2= new StringBuffer();    new Thread () {    public void run() {   synchronized(s1) {   s2.append(“A”);   synchronized(s2) {    s2.append(“B”);    System.out.print(s1);    System.out.print(s2);   }   }    }    }.start();   new Thread() {   public void run() {   synchronized(s2) {  s2.append(“C”);  synchronized(s1) {   s1.append(“D”);  System.out.print(s2);  System.out.print(s1);   }   }    }   }.start();   }   }   Which two statements are true? ()A、 The program prints “ABBCAD”B、 The program prints “CDDACB”C、 The program prints “ADCBADBC”D、 The output is a non-deterministic point because of a possible deadlock condition.E、 The output is dependent on the threading model of the system the program is running on.” 相关考题
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考题 单选题public class SyncTest {  private int x;  private int y;  private synchronized void setX( int i ) { x = i; }  private synchronized void setY( int i ) { y = i; }  public void setXY( int i ) { setX(i); setY(i); }  public synchronized boolean check() { return x != y; }  }   Under which condition will check return true when called from a different class? ()A  check can never return true.B  check can return true when setXY is called by multiple threads.C  check can return true when multiple threads call setX and setY separately.D  check can return true only if SyncTest is changed to allow x and y to be set separately.

考题 单选题What produces a compiler error?()A  class A { public A(int x) {} }B  class A {} class B extends A { B() {} }C  class A { A() {} } class B { public B() {} }D  class Z { public Z(int) {} } class A extends Z {}

考题 单选题public class SyncTest {  private int x;   private int y;   public synchronized void setX (int i) (x=1;)   public synchronized void setY (int i) (y=1;)   public synchronized void setXY(int 1)(set X(i); setY(i);)   public synchronized Boolean check() (return x !=y;)   }   Under which conditions will check () return true when called from a different class?A  Check() can never return true.B  Check() can return true when setXY is called by multiple threads.C  Check() can return true when multiple threads call setX and setY separately.D  Check() can only return true if SyncTest is changed to allow x and y to be set separately.