单选题20. public float getSalary(Employee e) {  21. assert validEmployee(e);  22. float sal = lookupSalary(e);  23. assert (sal0);  24. return sal;  25. }  26. private int getAge(Employee e) {  27. assert validEmployee(e);  28. int age = lookupAge(e);  29. assert (age0);  30. return age;  31. }  Which line is a violation of appropriate use of the assertion mechanism?()A line 21B line 23C line 27D line 29

单选题
20. public float getSalary(Employee e) {  21. assert validEmployee(e);  22. float sal = lookupSalary(e);  23. assert (sal>0);  24. return sal;  25. }  26. private int getAge(Employee e) {  27. assert validEmployee(e);  28. int age = lookupAge(e);  29. assert (age>0);  30. return age;  31. }  Which line is a violation of appropriate use of the assertion mechanism?()
A

 line 21

B

 line 23

C

 line 27

D

 line 29


参考解析

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20.publicfloatgetSalary(Employeee){21.assertvalidEmployee(e);22.floatsal=lookupSalary(e);23.assert(sal0);24.returnsal;25.}26.privateintgetAge(Employeee){27.assertvalidEmployee(e);28.intage=lookupAge(e);29.assert(age0);30.returnage;31.}Whichlineisaviolationofappropriateuseoftheassertionmechanism?()A.line21B.line23C.line27D.line29

Given:11. public void go(int x) {Which statement is true?() A.All of the assert statements are used appropriately.B.Only the assert statement on line 12 is used appropriately.C.Only the assert statement on line 15 is used appropriately.D.Only the assert statement on line 18 is used appropriately.E.Only the assert statements on lines 12 and 15 are used appropriately.F.Only the assert statements on lines 12 and 18 are used appropriately.G.Only the assert statements on lines 15 and 18 are used appropriately.

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类testl定义如下: public class test1 { public float amethod(float a,float b){ } }A.public foat amethod(float a,float b,foat c){ }B.public float amethod(float c,float d){ }C.public int amethod(int a,int b){ }D.private float amethod(int a,int b,int c){ }

类Test定义如下,将下列哪个方法插入③行处是不合法的( )?① public class Test{② public float Method(float a,float B) { }③ ______④ }A.public float Method(float a,float b,float C) { }B.public float Method(float c,float d){ }C.public int Method(int a,int B) { }private float Method(int a,int b,int C) { }D.private float Method(int a,int b,int C) { }

Given:  1. public class Method Over {  2. public void set Var (int a, int b, float c) {  3. }  4. }   Which two overload the set Var method()?A、 private void set Var(int a, float c, int b) {}B、 protected void set Var(int a, int b, float c) {}C、 public int set Var(int a, float c, int b) {return a:}D、 public int set Var(int a, int b, float c) {return a:}E、 protected float set Var(int a, int b, float c) {return c:}

23.int z=5;  24.  25. public void stuff1(int x) {  26. assert (x 0);  27. switch(x) {  28. case 2: x= 3;  29. default: assert false; } }  30.  31. private void stuff2(int y) { assert (y  0); }  32.  33. private void stuff3() { assert (stuff4O); } 34.  35. private boolean stuff4() { z = 6; return false; }  Which is true?()  A、 All of the assert statements are used appropriately.B、 Only the assert statement on line 31 is used appropriately.C、 The assert statements on lines 29 and 31 are used appropriately.D、 The assert statements on lines 26 and 29 are used appropriately.E、 The assert statements on lines 29 and 33 are used appropriately.F、 The assert statements on lines 29, 31, and 33 are used appropriately.G、 The assert statements on lines 26, 29, and 31 are used appropriately.

类Test1定义如下: 1.public class Test1{ 2. public float aMethod(float a,float b){ return 0;} 3. 4.} 将以下哪种方法插入行3是不合法的。()A、public float aMethod(float a, float b,float c){ return 0;}B、public float aMethod(float c,float d){ return 0;}C、public int aMethod(int a, int b){ return 0;}D、private float aMethod(int a,int b,int c){ return 0;}

20. public float getSalary(Employee e) {  21. assert validEmployee(e);  22. float sal = lookupSalary(e);  23. assert (sal0);  24. return sal;  25. }  26. private int getAge(Employee e) {  27. assert validEmployee(e);  28. int age = lookupAge(e);  29. assert (age0);  30. return age;  31. }  Which line is a violation of appropriate use of the assertion mechanism?()  A、 line 21B、 line 23C、 line 27D、 line 29

11. public class Test {  12. public void foo() {  13. assert false;  14. assert false;  15. }  16. public void bar(){  17. while(true){  18. assert false;  19. }  20. assert false;  21. }  22. }  What causes compilation to fail?()  A、 Line 13B、 Line 14C、 Line 18D、 Line 20

11. class Payload {  12. private int weight;  13. public Payload(int wt) { weight = wt; }  13. public void setWeight(mt w) { weight = w; }  15. public String toString { return Integer.toString(weight); }  16. }  17.  18. public class TestPayload {  19. static void changePayload(Payload p) { 20. /* insert code here */ 21. }  22.  23. public static void main(String[] args) {  24. Payload p = new Payload();  25. p.setWeight(1024);  26. changePayload(p);  27. System.out.println(”The value of p is “+ p);  28. }  29. }  Which statement, placed at line 20, causes the code to print “The value of p is 420.”?() A、 p.setWeight(420);B、 p.changePayload(420);C、 p = new Payload(420);D、 Payload.setWeight(420);E、 p = Payload.setWeight(420);F、 p = new Payload(); p.setWeight(420);

public class MethodOver {   private int x, y;   private float z;   public void setVar(int a, int b, float c){   x = a;   y = b;   z = c;   }   }   Which two overload the setVar method?()A、 void setVar (int a, int b, float c){  x = a;  y = b;  z = c;  }B、 public void setVar(int a, float c, int b) {  setVar(a, b, c);  }C、 public void setVar(int a, float c, int b) {  this(a, b, c);  }D、 public void setVar(int a, float b){  x = a;  z = b;  }E、 public void setVar(int ax, int by, float cz) {  x = ax;  y = by;  z = cz;  }

public class MethodOver  {  public void setVar (int a, int b, float c)  {  }  }   Which two overload the setVar method?()  A、 Private void setVar (int a, float c, int b)  { }B、 Protected void setVar (int a, int b, float c) { }C、 Public int setVar (int a, float c, int b) (return a;)D、 Public int setVar (int a, int b, float c) (return a;)E、 Protected float setVar (int a, int b, float c) (return c;)

11. class Person {  12. String name = “No name‟;  13. public Person(String nm) { name = nm; }  14. }  15.  16. class Employee extends Person {  17. String emplD = “0000”;  18. public Employee(String id) { empID = id; }  19. }  20.  21. public class EmployeeTest {  22. public static void main(String[] args) {  23. Employee e = new Employee(”4321”);  24. System.out.println(e.empID);  25. }  26. }  What is the result?() A、 4321B、 0000C、 An exception is thrown at runtime.D、 Compilation fails because of an error in line 18.

10. class Inner {  11. private int x;  12. public void setX( int x) { this.x = x; }  13. public int getX() { return x; }  14. }  15.  16. class Outer {  17. private Inner y;  18. public void setY( Inner y) { this.y = y; }  19. public Inner getY() { return y; }  20. }  21.  22. public class Gamma {  23. public static void main( String[] args) { 24. Outer o = new Outer(); 25. Inner i = new Inner();  26.int n=10;  27. i.setX(n);  28. o.setY(i);  29. // insert code here  30. System.out.println( o.getY().getX());  31. }  32. }  Which three code fragments, added individually at line 29, produce the output 100?()A、 n = 100;B、 i.setX( 100);C、 o.getY().setX( 100);D、 i = new Inner(); i.setX( 100);E、 o.setY( i); i = new Inner(); i.setX( 100);F、 i = new Inner(); i.setX( 100); o.setY( i);

10. interface Foo {  11. int bar();  12. }  13.  14. public class Beta {  15.  16. class A implements Foo {  17. public int bar() { return 1; }  18. }  19.  20. public int fubar( Foo foo) { return foo.bar(); }  21.  22. public void testFoo() {  23.  24. class A implements Foo {  25. public int bar() { return 2; }  26. }  27.  28. System.out.println( fubar( new A())); 29. }  30.  31. public static void main( String[] argv) {  32. new Beta().testFoo();  33. }  34. }  Which three statements are true?()A、 Compilation fails.B、 The code compiles and the output is 2.C、 If lines 16, 17 and 18 were removed, compilation would fail.D、 If lines 24, 25 and 26 were removed, compilation would fail.E、 If lines 16, 17 and 18 were removed, the code would compile and the output would be 2.F、 If lines 24, 25 and 26 were removed, the code would compile and the output would be 1.

Which fragment is an example of inappropriate use of assertions? ()A、 assert (!(map.contains(x))); map.add(x);B、 if (x  0){}else { assert (x==0); }C、 public void aMethod(int x) { assert (x  0); }D、 assert (invariantCondition()); return retval;E、 switch (x) { case 1: break; case 2: creak; default: assert (x == 0);

多选题public class MethodOver  {  public void setVar (int a, int b, float c)  {  }  }   Which two overload the setVar method?()APrivate void setVar (int a, float c, int b)  { }BProtected void setVar (int a, int b, float c) { }CPublic int setVar (int a, float c, int b) (return a;)DPublic int setVar (int a, int b, float c) (return a;)EProtected float setVar (int a, int b, float c) (return c;)

多选题10. class Inner {  11. private int x;  12. public void setX( int x) { this.x = x; }  13. public int getX() { return x; }  14. }  15.  16. class Outer {  17. private Inner y;  18. public void setY( Inner y) { this.y = y; }  19. public Inner getY() { return y; }  20. }  21.  22. public class Gamma {  23. public static void main( String[] args) { 24. Outer o = new Outer(); 25. Inner i = new Inner();  26.int n=10;  27. i.setX(n);  28. o.setY(i);  29. // insert code here  30. System.out.println( o.getY().getX());  31. }  32. }  Which three code fragments, added individually at line 29, produce the output 100?()An = 100;Bi.setX( 100);Co.getY().setX( 100);Di = new Inner(); i.setX( 100);Eo.setY( i); i = new Inner(); i.setX( 100);Fi = new Inner(); i.setX( 100); o.setY( i);

单选题11. class Person {  12. String name = “No name‟;  13. public Person(String nm) { name = nm; }  14. }  15.  16. class Employee extends Person {  17. String emplD = “0000”;  18. public Employee(String id) { empID = id; }  19. }  20.  21. public class EmployeeTest {  22. public static void main(String[] args) {  23. Employee e = new Employee(”4321”);  24. System.out.println(e.empID);  25. }  26. }  What is the result?()A 4321B 0000C An exception is thrown at runtime.D Compilation fails because of an error in line 18.

单选题下列选项中,能实现对父类的getSalary方法重写的是(  )。class Employee{public double getSalary(){}}Aclass Manager extends Employee{public int getSalary(double x){}}Bclass Manager extends Employee{public double getSalary(int x,int y){}}Cclass Manager extends Employee{public double getSalary(){}}Dclass Manager extends Employee{public int getSalary(int x,int y){}}

单选题类Test1定义如下: 1.public class Test1{ 2. public float aMethod(float a,float b){ return 0;} 3. 4.} 将以下哪种方法插入行3是不合法的。()Apublic float aMethod(float a, float b,float c){ return 0;}Bpublic float aMethod(float c,float d){ return 0;}Cpublic int aMethod(int a, int b){ return 0;}Dprivate float aMethod(int a,int b,int c){ return 0;}

单选题Which fragment is an example of inappropriate use of assertions? ()A assert (!(map.contains(x))); map.add(x);B if (x  0){}else { assert (x==0); }C public void aMethod(int x) { assert (x  0); }D assert (invariantCondition()); return retval;E switch (x) { case 1: break; case 2: creak; default: assert (x == 0);

多选题10. interface Foo {  11. int bar();  12. }  13.  14. public class Beta {  15.  16. class A implements Foo {  17. public int bar() { return 1; }  18. }  19.  20. public int fubar( Foo foo) { return foo.bar(); }  21.  22. public void testFoo() {  23.  24. class A implements Foo {  25. public int bar() { return 2; }  26. }  27.  28. System.out.println( fubar( new A())); 29. }  30.  31. public static void main( String[] argv) {  32. new Beta().testFoo();  33. }  34. }  Which three statements are true?()ACompilation fails.BThe code compiles and the output is 2.CIf lines 16, 17 and 18 were removed, compilation would fail.DIf lines 24, 25 and 26 were removed, compilation would fail.EIf lines 16, 17 and 18 were removed, the code would compile and the output would be 2.FIf lines 24, 25 and 26 were removed, the code would compile and the output would be 1.

单选题11. class Payload {  12. private int weight;  13. public Payload(int wt) { weight = wt; }  13. public void setWeight(mt w) { weight = w; }  15. public String toString { return Integer.toString(weight); }  16. }  17.  18. public class TestPayload {  19. static void changePayload(Payload p) { 20. /* insert code here */ 21. }  22.  23. public static void main(String[] args) {  24. Payload p = new Payload();  25. p.setWeight(1024);  26. changePayload(p);  27. System.out.println(”The value of p is “+ p);  28. }  29. }  Which statement, placed at line 20, causes the code to print “The value of p is 420.”?()A p.setWeight(420);B p.changePayload(420);C p = new Payload(420);D Payload.setWeight(420);E p = Payload.setWeight(420);F p = new Payload(); p.setWeight(420);

单选题23.int z=5;  24.  25. public void stuff1(int x) {  26. assert (x 0);  27. switch(x) {  28. case 2: x= 3;  29. default: assert false; } }  30.  31. private void stuff2(int y) { assert (y  0); }  32.  33. private void stuff3() { assert (stuff4O); } 34.  35. private boolean stuff4() { z = 6; return false; }  Which is true?()A All of the assert statements are used appropriately.B Only the assert statement on line 31 is used appropriately.C The assert statements on lines 29 and 31 are used appropriately.D The assert statements on lines 26 and 29 are used appropriately.E The assert statements on lines 29 and 33 are used appropriately.F The assert statements on lines 29, 31, and 33 are used appropriately.G The assert statements on lines 26, 29, and 31 are used appropriately.

单选题11. public class Test {  12. public void foo() {  13. assert false;  14. assert false;  15. }  16. public void bar(){  17. while(true){  18. assert false;  19. }  20. assert false;  21. }  22. }  What causes compilation to fail?()A Line 13B Line 14C Line 18D Line 20

单选题20. public float getSalary(Employee e) {  21. assert validEmployee(e);  22. float sal = lookupSalary(e);  23. assert (sal0);  24. return sal;  25. }  26. private int getAge(Employee e) {  27. assert validEmployee(e);  28. int age = lookupAge(e);  29. assert (age0);  30. return age;  31. }  Which line is a violation of appropriate use of the assertion mechanism?()A line 21B line 23C line 27D line 29