Which three will compile and rim without exception?()A、 private synchronized Object o;B、 void go() { synchronized() { /* code here */ } }C、 public synchronized void go() { /* code here */ }D、 private synchronized(this) void go() { /* code here */ }E、 void go() { synchronized(Object.class) { /* code here */ } }F、 void go() { Object o = new Object(); synchronized(o) { /* code here */ } }

Which three will compile and rim without exception?()

  • A、 private synchronized Object o;
  • B、 void go() { synchronized() { /* code here */ } }
  • C、 public synchronized void go() { /* code here */ }
  • D、 private synchronized(this) void go() { /* code here */ }
  • E、 void go() { synchronized(Object.class) { /* code here */ } }
  • F、 void go() { Object o = new Object(); synchronized(o) { /* code here */ } }

相关考题:

What happens when you try to compile and run the following program?class Mystery{String s;public static void main(String[] args){Mystery m=new Mystery();m.go();}void Mystery(){s=”constructor”;}void go(){System.out.println(s);}}()A.this code will not compileB.this code compliles but throws an exception at runtimeC.this code runs and “constructor” in the standard outputD.this code runs and writes “null” in the standard output

Given:Which three methods, inserted individually at line 14, will correctly complete class Two?() A.int foo() { /* more code here */ }B.void foo() { /* more code here */ }C.public void foo() { /* more code here */ }D.private void foo() { /* more code here */ }E.protected void foo() { /* more code here */ }

Given:Which two changes, taken together, would guarantee the output: 1, 2, 3, 4, 5, ?() A.move the line 12 print statement into the foo() methodB.change line 7 to public synchronized void go() {C.change the variable declaration on line 2 to private volatile int x;D.wrap the code inside the foo() method with a synchronized( this ) blockE.wrap the for loop code inside the go() method with a synchronized block synchronized(this){ //for loop code here }

下列程序的输出结果为( )。 public class Reentrant { public synchronized void a() { b(); System.out.println("here I am,in a()"); } public synchronized void b() { System.out.println("here I am,in b()"); } public static void main(String args[]) { Reentrant r=new Reentrant(); r.a(); } }A.here I am,in a()/here I am,in b()B.here I am,in b()/here I am,in a()C.here I am,in a()D.here I am,in b()

下列程序的输出结果为( )。 public class Reentrant { public synchronized void a() { b(); System.out.println("here I am, in a()"); } public synchronized void b() { System.out.println("here I am, in b()"); } public static void main(String args[ ]) { Reentrant r=new Reentrant(); r.a(); } }A.here I am, in a()/here I am, in b()B.hereI am, in b()/here I am, in a()C.here I am, in a()D.here I am, in b()

以下哪个方法可以用来获得进度条的当前进度值?()A、public synchronized int getProgress()B、public synchronized void setIndeterminate (boolean indeterminate)C、public synchronized void setProgress(int progress)D、Public final synchronized void incrementProgressBy(int diff)

class One {  void foo() {}  }  class Two extends One {   //insert method here  }  Which three methods, inserted individually at line 14, will correctly complete class Two?()A、 int foo() { /* more code here */ }B、 void foo() { /* more code here */ }C、 public void foo() { /* more code here */ }D、 private void foo() { /* more code here */ }E、 protected void foo() { /* more code here */ }

现有:  1.  class Propeller2  {  2.   pulolic static void main (String[]args)//add code here?      3.    {  new Propeller2().topGo();  }      4.  5.void topGo()  //add code here?      6.    {   middleGo();  }      7.  8.void middleGo()  //add code here?  9. {   go();  System.out.println ("late middle");  }    void go()  //add code here?      12.    {throw new Exception();  }      13.  }  为使代码通过编译,需要在哪一行加入声明throws Exception?()     A、只在第11行B、在第8行和第11行C、在第5行、第8行和第11行D、在第2行、第5行、第8行和第11行

public class Team extends java.util.LinkedList {  public void addPlayer(Player p) {  add(p);  }  public void compete(Team opponent) { /* more code here */ }  }  class Player { /* more code here */ }  Which two are true?()A、 This code will compile.B、 This code demonstrates proper design of an is-a relationship.C、 This code demonstrates proper design of a has-a relationship.D、 A Java programmer using the Team class could remove Player objects from a Team object.

import java.util.*;  public class NameList {  private List names = new ArrayList();  public synchronized void add(String name) { names.add(name); }  public synchronized void printAll() {  for (int i = 0; i System.out.print(names.get(i) +“ “); }  }  public static void main(String[] args) {  final NameList sl = new NameList();  for(int i=0;i2;i++) {  new Thread() {  public void ruin() {  sl.add(”A”);  sl.add(”B”);  sl.add(”C”);  sl.printAll();  }  }.start();  }  }  }  Which two statements are true if this class is compiled and run?() A、 An exception may be thrown at runtime.B、 The code may run with no output, without exiting.C、The code may rum with output “A B A B C C “, then exit.D、The code may ruin with output “A A A B C A B C C “, then exit.E、 The code may rum with output “A B C A B C A B C “, then exit.F、The code may ruin with output “A B C A A B C A B C “, then exit.

Which three will compile and run without exception?()A、private synchronized Object o;B、void go(){   synchronized(){/* code here */}C、public synchronized void go(){/* code here */}D、private synchronized(this) void go(){/* code here */}E、void go(){   synchronized(Object.class){/* code here */}F、void go(){   Object o = new Object();   synchronized(o){/* code here */}

public class NamedCounter {  private final String name;  private int count;  public NamedCounter(String name) { this.name = name; }  public String getName() { return name; }  public void increment() { coount++; }  public int getCount() { return count; } public void reset() { count = 0; } }  Which three changes should be made to adapt this class to be used safely by multiple threads? ()A、 declare reset() using the synchronized keywordB、 declare getName() using the synchronized keywordC、 declare getCount() using the synchronized keywordD、 declare the constructor using the synchronized keywordE、 declare increment() using the synchronized keyword

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.

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?() A、 The code will deadlock.B、 The code may run with no output.C、 An exception is thrown at runtime.D、 The code may run with output “0 6”.E、 The code may run with output “2 0 6 4‟.F、 The code may ruin with output “0 2 4 6”.

public abstract class Shape {  private int x;  private int y;  public abstract void draw();  public void setAnchor(int x, int y) {  this.x = x;  this.y = y;  }  }  Which two classes use the Shape class correctly?()A、 public class Circle implements Shape { private int radius; }B、 public abstract class Circle extends Shape { private int radius; }C、 public class Circle extends Shape { private int radius; public void draw(); }D、 public abstract class Circle implements Shape { private int radius; public void draw(); }E、 public class Circle extends Shape { private int radius;public void draw() {/* code here */} }F、 public abstract class Circle implements Shape { private int radius;public void draw() { / code here */ } }

public class TestFive {  private int x;  public void foo() {  int current = x;  x = current + 1;  }  public void go() {  for(int i=0;i5;i++) {  new Thread() {  public void run() {  foo();  System.out.print(x + “, “);  } }.start();  }}}  Which two changes, taken together, would guarantee the output: 1, 2, 3, 4, 5, ?()A、 Move the line 12 print statement into the foo() method.B、 Change line 7 to public synchronized void go() {.C、 Change the variable declaration on line 3 to private volatile int x;.D、 Wrap the code inside the foo() method with a synchronized( this ) block.E、 Wrap the for loop code inside the go() method with a synchronized block synchronized(this) { // for loop code here }.

Given:   10. class One {   11. void foo() { }   12. }   13. class Two extends One {   14. //insert method here   15. }   Which three methods, inserted individually at line 14, will correctly complete class Two?()A、 public void foo() { /* more code here */ }B、 private void foo() { /* more code here */ }C、 protected void foo() { /* more code here */ }D、 int foo() { /* more code here */ }  E、 void foo() { /* more code here */ }

多选题Given:   10. class One {   11. void foo() { }   12. }   13. class Two extends One {   14. //insert method here   15. }   Which three methods, inserted individually at line 14, will correctly complete class Two?()Apublic void foo() { /* more code here */ }Bprivate void foo() { /* more code here */ }Cprotected void foo() { /* more code here */ }Dint foo() { /* more code here */ }Evoid foo() { /* more code here */ }

多选题import java.util.*;  public class NameList {  private List names = new ArrayList();  public synchronized void add(String name) { names.add(name); }  public synchronized void printAll() {  for (int i = 0; i System.out.print(names.get(i) +“ “); }  }  public static void main(String[] args) {  final NameList sl = new NameList();  for(int i=0;iAAn exception may be thrown at runtime.BThe code may run with no output, without exiting.CThe code may rum with output “A B A B C C “, then exit.DThe code may ruin with output “A A A B C A B C C “, then exit.EThe code may rum with output “A B C A B C A B C “, then exit.FThe code may ruin with output “A B C A A B C A B C “, then exit.

多选题Given: Which three methods, inserted individually at line 14, will correctly complete class Two?()Aint foo() { /* more code here */ }Bvoid foo() { /* more code here */ }Cpublic void foo() { /* more code here */ }Dprivate void foo() { /* more code here */ }Eprotected void foo() { /* more code here */ }

多选题Which three will compile and run without exception?()Aprivate synchronized Object o;Bvoid go() {synchronized() { /* code here */ }Cpublic synchronized void go() { /* code here */ }Dprivate synchronized(this) void go() { /* code here */ }Evoid go() {synchronized(Object.class) { /* code here */ }Fvoid go() {Object o = new Object();synchronized(o) { /* code here */ }

多选题public class Team extends java.util.LinkedList {  public void addPlayer(Player p) {  add(p);  }  public void compete(Team opponent) { /* more code here */ }  }  class Player { /* more code here */ }  Which two are true?()AThis code will compile.BThis code demonstrates proper design of an is-a relationship.CThis code demonstrates proper design of a has-a relationship.DA Java programmer using the Team class could remove Player objects from a Team object.

多选题Which three will compile and rim without exception?()Aprivate synchronized Object o;Bvoid go() { synchronized() { /* code here */ } }Cpublic synchronized void go() { /* code here */ }Dprivate synchronized(this) void go() { /* code here */ }Evoid go() { synchronized(Object.class) { /* code here */ } }Fvoid go() { Object o = new Object(); synchronized(o) { /* code here */ } }

多选题public class TestFive {  private int x;  public void foo() {  int current = x;  x = current + 1;  }  public void go() {  for(int i=0;i5;i++) {  new Thread() {  public void run() {  foo();  System.out.print(x + “, “);  } }.start();  }}}  Which two changes, taken together, would guarantee the output: 1, 2, 3, 4, 5, ?()AMove the line 12 print statement into the foo() method.BChange line 7 to public synchronized void go() {.CChange the variable declaration on line 3 to private volatile int x;.DWrap the code inside the foo() method with a synchronized( this ) block.EWrap the for loop code inside the go() method with a synchronized block synchronized(this) { // for loop code here }.

单选题现有:  1.  class Propeller2  {  2.   pulolic static void main (String[]args)//add code here?      3.    {  new Propeller2().topGo();  }      4.  5.void topGo()  //add code here?      6.    {   middleGo();  }      7.  8.void middleGo()  //add code here?  9. {   go();  System.out.println ("late middle");  }    void go()  //add code here?      12.    {throw new Exception();  }      13.  }  为使代码通过编译,需要在哪一行加入声明throws Exception?()A只在第11行B在第8行和第11行C在第5行、第8行和第11行D在第2行、第5行、第8行和第11行

多选题class One {  void foo() {}  }  class Two extends One {   //insert method here  }  Which three methods, inserted individually at line 14, will correctly complete class Two?()Aint foo() { /* more code here */ }Bvoid foo() { /* more code here */ }Cpublic void foo() { /* more code here */ }Dprivate void foo() { /* more code here */ }Eprotected void foo() { /* more code here */ }

多选题public abstract class Shape {  private int x;  private int y;  public abstract void draw();  public void setAnchor(int x, int y) {  this.x = x;  this.y = y;  }  }  Which two classes use the Shape class correctly?()Apublic class Circle implements Shape { private int radius; }Bpublic abstract class Circle extends Shape { private int radius; }Cpublic class Circle extends Shape { private int radius; public void draw(); }Dpublic abstract class Circle implements Shape { private int radius; public void draw(); }Epublic class Circle extends Shape { private int radius;public void draw() {/* code here */} }Fpublic abstract class Circle implements Shape { private int radius;public void draw() { / code here */ } }