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单选题
Click the Exhibit button.   Given this code from Class B:   25. A a1 = new A();   26. A a2 = new A();   27. A a3 = new A();   28. System.out.println(A.getInstanceCount());   What is the result?()
A

 Compilation of class A fails.

B

 Line 28 prints the value 3 to System.out.

C

 Line 28 prints the value 1 to System.out.

D

 Compilation fails because of an error on line 28.

E

 A runtime error occurs when line 25 executes.


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更多 “单选题Click the Exhibit button.   Given this code from Class B:   25. A a1 = new A();   26. A a2 = new A();   27. A a3 = new A();   28. System.out.println(A.getInstanceCount());   What is the result?()A  Compilation of class A fails.B  Line 28 prints the value 3 to System.out.C  Line 28 prints the value 1 to System.out.D  Compilation fails because of an error on line 28.E  A runtime error occurs when line 25 executes.” 相关考题
考题 Click the Exhibit button. Given: ClassA a = new ClassA(); a.methodA(); What is the result? () A.Compilation fails.B.ClassC is displayed.C.The code runs with no output.D.An exception is thrown at runtime.

考题 Click the Exhibit button.Given:What is the result?() A.Line 26 prints a to System.out.B.Line 26 prints b to System.out.C.An exception is thrown at line 26 at runtime.D.Compilation of class A will fail due to an error in line 6.

考题 Click the Exhibit button. Given:Which two statements are true if a NullPointerException is thrown on line 3 of class C? () A.The application will crash.B.The code on line 29 will be executed.C.The code on line 5 of class A will execute.D.The code on line 5 of class B will execute.E.The exception will be propagated back to line 27.

考题 public class Threads3 implements Runnable {  public void run() {  System.out.print(”running”);  }  public static void main(String[] args) {  Thread t = new Thread(new Threads3());  t.run();  t.run();  t.start();  }  }  What is the result?() A、 Compilation fails.B、 An exception is thrown at runtime.C、 The code executes and prints “running”.D、 The code executes and prints “runningrunning”.E、 The code executes and prints “runningrunningrunning”.

考题 public class Threads5 {  public static void main (String[] args) {  new Thread(new Runnable() {  public void run() {  System.out.print(”bar”);  } }).start();  }  }  What is the result?() A、 Compilation fails.B、 An exception is thrown at runtime.C、 The code executes normally and prints “bar”.D、 The code executes normally, but nothing prints.

考题 10. interface A { void x(); }  11. class B implements A { public void x() { } public voidy() { } }  12. class C extends B { public void x() {} }  And:  20. java.util.List list = new java.util.ArrayList();  21. list.add(new B());  22. list.add(new C());  23. for (A a:list) {  24. a.x();  25. a.y();;  26. }  What is the result?()  A、 The code runs with no output.B、 An exception is thrown at runtime.C、 Compilation fails because of an error in line 20.D、 Compilation fails because of an error in line 21.E、 Compilation fails because of an error in line 23.F、 Compilation fails because of an error in line 25.

考题 class A {  public A() {  System.out.println(“hello from a”);  }  }  class B extends A {  public B () {  System.out.println(“hello from b”);  super();  }  }  public class Test {  public static void main(String args[]) {  A a = new B();  }  }   What is the result when main is executed?()  A、 Compilation fails.B、 hello from aC、 hello from bD、 hello from b hello from aE、 hello from a hello from b

考题 23. Object [] myObjects = {  24. new integer(12),  25. new String(”foo”),  26. new integer(5),  27. new Boolean(true)  28. };  29. Arrays.sort(myObjects);  30. for( int i=0; i31. System.out.print(myObjects[i].toString());  32. System.out.print(” “);  33. }  What is the result?()  A、 Compilation fails due to an error in line 23.B、 Compilation fails due to an error in line 29.C、 A ClassCastException occurs in line 29.D、 A ClassCastException occurs in line 31.E、 The value of all four objects prints in natural order.

考题 1. public class A {  2. public void method1() {  3. B b=new B();  4. b.method2();  5. // more code here  6. }  7. }  1. public class B {  2. public void method2() {  3.C c=new C();  4. c.method3();  5. // more code here  6. }  7. }  1. public class C {  2. public void method3() {  3. // more code here  4. }  5. }  Given:  25. try {  26. A a=new A();  27. a.method1();  28. } catch (Exception e) {  29. System.out.print(”an error occurred”);  30. }  Which two are true if a NullPointerException is thrown on line 3 of class C?()A、 The application will crash.B、 The code on line 29 will be executed.C、 The code on line 5 of class A will execute.D、 The code on line 5 of class B will execute.E、 The exception will be propagated back to line 27.

考题 11. class Cup { }  12. class PoisonCup extends Cup { }  21. public void takeCup(Cup c) {  22. if(c instanceof PoisonCup) {  23. System.out.println(”Inconceivable!”);  24. } else if(c instanceof Cup) {  25. System.out.println(”Dizzying intellect!”);  26. } else {  27. System.exit(0);  28. }  29. }  And the execution of the statements:  Cup cup = new PoisonCup(); takeCup(cup);  What is the output?() A、 Inconceivable!B、 Dizzying intellect!C、 The code runs with no output.D、 An exception is thrown at runtime.E、 Compilation fails because of an error in line 22.

考题 1. public class A {  2.  3. private int counter = 0;  4.  5. public static int getInstanceCount() {  6. return counter;  7. }  8.  9. public A() {  10. counter++;  11. }  12.  13. }  Given this code from Class B:  25.A a1 =new A();  26. A a2 =new A();  27. A a3 =new A();  28. System.out.printIn(A.getInstanceCount() ); What is the result?() A、 Compilation of class A fails.B、 Line 28 prints the value 3 to System.out.C、 Line 28 prints the value 1 to System.out.D、 A runtime error occurs when line 25 executes.E、 Compilation fails because of an error on line 28.

考题 1. public class A {  2. public String doit(int x, int y) {  3. return “a”;  4. }  5.  6. public String doit(int... vals) {  7. return “b”;  8. } 9. }  Given:  25. A a=new A();  26. System.out.println(a.doit(4, 5));  What is the result?() A、 Line 26 prints “a” to System.out.B、 Line 26 prints „b” to System.out.C、 An exception is thrown at line 26 at runtime.D、 Compilation of class A will fail due to an error in line 6.

考题 单选题public class Threads3 implements Runnable {  public void run() {  System.out.print(”running”);  }  public static void main(String[] args) {  Thread t = new Thread(new Threads3());  t.run();  t.run();  t.start();  }  }  What is the result?()A  Compilation fails.B  An exception is thrown at runtime.C  The code executes and prints “running”.D  The code executes and prints “runningrunning”.E  The code executes and prints “runningrunningrunning”.

考题 单选题1. public class A {  2. public String doit(int x, int y) {  3. return “a”;  4. }  5.  6. public String doit(int... vals) {  7. return “b”;  8. } 9. }  Given:  25. A a=new A();  26. System.out.println(a.doit(4, 5));  What is the result?()A  Line 26 prints “a” to System.out.B  Line 26 prints „b” to System.out.C  An exception is thrown at line 26 at runtime.D  Compilation of class A will fail due to an error in line 6.

考题 单选题Click the Exhibit button. Given: ClassA a = new ClassA( ); a.methodA( ); What is the result? ()A Compilation fails.B ClassC is displayed.C The code runs with no output.D An exception is thrown at runtime.

考题 单选题Click the Exhibit button. Given this code from Class B: 25.A a1 = new A(); 26.A a2 = new A(); 27.A a3 = new A(); 28.System.out.println(A.getInstanceCount()); What is the result?()A Compilation of class A fails.B Line 28 prints the value 3 to System.out.C Line 28 prints the value 1 to System.out.D A runtime error occurs when line 25 executes.E Compilation fails because of an error on line 28.

考题 单选题11. class Cup { }  12. class PoisonCup extends Cup { }  21. public void takeCup(Cup c) {  22. if(c instanceof PoisonCup) {  23. System.out.println(”Inconceivable!”);  24. } else if(c instanceof Cup) {  25. System.out.println(”Dizzying intellect!”);  26. } else {  27. System.exit(0);  28. }  29. }  And the execution of the statements:  Cup cup = new PoisonCup(); takeCup(cup);  What is the output?()A  Inconceivable!B  Dizzying intellect!C  The code runs with no output.D  An exception is thrown at runtime.E  Compilation fails because of an error in line 22.

考题 单选题Click the Exhibit button.   Given: ClassA a = new ClassA();   a.methodA();   What is the result?()A  The code runs with no output.B  Compilation fails.C  An exception is thrown at runtime.D  ClassC is displayed.

考题 单选题Click the Exhibit button. What is the result?()A Line 26 prints "a" to System.out.B Line 26 prints "b" to System.out.C An exception is thrown at line 26 at runtime.D Compilation of class A will fail due to an error in line 6.

考题 单选题public class Threads5 {  public static void main (String[] args) {  new Thread(new Runnable() {  public void run() {  System.out.print(”bar”);  } }).start();  }  }  What is the result?()A  Compilation fails.B  An exception is thrown at runtime.C  The code executes normally and prints “bar”.D  The code executes normally, but nothing prints.

考题 单选题Click the Exhibit button. What is the result?()A Compilation of class A fails.B Line 28 prints the value 3 to System.out.C Line 28 prints the value 1 to System.out.D A runtime error occurs when line 25 executes.E Compilation fails because of an error on line 28.

考题 单选题What is the result?()A Compilation of class A fails.B Line 28 prints the value 3 to System.out.C Line 28 prints the value 1 to System.out.D A runtime error occurs when line 25 executes.E Compilation fails because of an error on line 28.

考题 单选题class A {  public A() {  System.out.println(“hello from a”);  }  }  class B extends A {  public B () {  System.out.println(“hello from b”);  super();  }  }  public class Test {  public static void main(String args[]) {  A a = new B();  }  }   What is the result when main is executed?()A  Compilation fails.B  hello from aC  hello from bD  hello from b hello from aE  hello from a hello from b

考题 多选题Click the Exhibit button. Given: Which two statements are true if a NullPointerException is thrown on line 3 of class C? ()AThe application will crash.BThe code on line 29 will be executed.CThe code on line 5 of class A will execute.DThe code on line 5 of class B will execute.EThe exception will be propagated back to line 27.

考题 单选题23. Object [] myObjects = {  24. new integer(12),  25. new String(”foo”),  26. new integer(5),  27. new Boolean(true)  28. };  29. Arrays.sort(myObjects);  30. for( int i=0; i31. System.out.print(myObjects[i].toString());  32. System.out.print(” “);  33. }  What is the result?()A  Compilation fails due to an error in line 23.B  Compilation fails due to an error in line 29.C  A ClassCastException occurs in line 29.D  A ClassCastException occurs in line 31.E  The value of all four objects prints in natural order.

考题 单选题1. public class A {  2.  3. private int counter = 0;  4.  5. public static int getInstanceCount() {  6. return counter;  7. }  8.  9. public A() {  10. counter++;  11. }  12.  13. }  Given this code from Class B:  25.A a1 =new A();  26. A a2 =new A();  27. A a3 =new A();  28. System.out.printIn(A.getInstanceCount() ); What is the result?()A  Compilation of class A fails.B  Line 28 prints the value 3 to System.out.C  Line 28 prints the value 1 to System.out.D  A runtime error occurs when line 25 executes.E  Compilation fails because of an error on line 28.

考题 单选题10. interface A { void x(); }  11. class B implements A { public void x() { } public voidy() { } }  12. class C extends B { public void x() {} }  And:  20. java.util.List list = new java.util.ArrayList();  21. list.add(new B());  22. list.add(new C());  23. for (A a:list) {  24. a.x();  25. a.y();;  26. }  What is the result?()A  The code runs with no output.B  An exception is thrown at runtime.C  Compilation fails because of an error in line 20.D  Compilation fails because of an error in line 21.E  Compilation fails because of an error in line 23.F  Compilation fails because of an error in line 25.