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单选题
public class Person { private name; public Person(String name) { this.name = name; } public int hashCode() { return 420; } } Which is true?()
A
The time to find the value from HashMap with a Person key depends on the size of the map.
B
Deleting a Person key from a HashMap will delete all map entries for all keys of typePerson.
C
Inserting a second Person object into a HashSet will cause the first Person object to beremoved as a duplicate.
D
The time to determine whether a Person object is contained in a HashSet is constant and does NOT depend on the size of the map.
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更多 “单选题public class Person { private name; public Person(String name) { this.name = name; } public int hashCode() { return 420; } } Which is true?()A The time to find the value from HashMap with a Person key depends on the size of the map.B Deleting a Person key from a HashMap will delete all map entries for all keys of typePerson.C Inserting a second Person object into a HashSet will cause the first Person object to beremoved as a duplicate.D The time to determine whether a Person object is contained in a HashSet is constant and does NOT depend on the size of the map.” 相关考题
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考题
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考题
Which three demonstrate an “is a” relationship?() A、 public class X { } public class Y extends X { }B、 public interface Shape { } public interface Rectangle extends Shape{ }C、 public interface Color { } public class Shape { private Color color; }D、 public interface Species { } public class Animal { private Species species; }E、 public class Person { } public class Employee { public Employee(Person person) { }F、 interface Component { } class Container implements Component { private Component[] children; }
考题
public class Person { private name; public Person(String name) { this.name = name; } public int hashCode() { return 420; } } Which is true?() A、 The time to find the value from HashMap with a Person key depends on the size of the map.B、 Deleting a Person key from a HashMap will delete all map entries for all keys of typePerson.C、 Inserting a second Person object into a HashSet will cause the first Person object to beremoved as a duplicate.D、 The time to determine whether a Person object is contained in a HashSet is constant and does NOT depend on the size of the map.
考题
Which the two demonstrate an “is a” relationship?()A、 public interface Person {} Public class Employee extends Person {}B、 public interface Shape {} public interface Rectangle extends Shape {}C、 public interface Color {} public class Shape { private Color color; }D、 public class Species {} public class Animal { private Species species; }E、 interface Component {} Class Container implements Component {private Component [] children;
考题
Which two demonstrate an “is a” relationship?() A、 public interface Person { } public class Employee extends Person { }B、 public interface Shape { } public class Employee extends Shape { }C、 public interface Color { } public class Employee extends Color { }D、 public class Species { } public class Animal (private Species species;)E、 interface Component { } Class Container implements Component ( Private Component[ ]children; )
考题
public class Person { private name; public Person(String name) { this.name = name; } public boolean equals(Object o) { if( !o instanceof Person ) return false; Person p = (Person) o; return p.name.equals(this.name); } } Which is true?() A、 Compilation fails because the hashCode method is not overridden.B、 A HashSet could contain multiple Person objects with the same name.C、 All Person objects will have the same hash code because the hashCode method is not overridden.D、 If a HashSet contains more than one Person object with name=”Fred”, then removing another person, also with name=”Fred”, will remove them all.
考题
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.
考题
单选题public class Person { private name; public Person(String name) { this.name = name; } public boolean equals(Object o) { if( !o instanceof Person ) return false; Person p = (Person) o; return p.name.equals(this.name); } } Which is true?()A
Compilation fails because the hashCode method is not overridden.B
A HashSet could contain multiple Person objects with the same name.C
All Person objects will have the same hash code because the hashCode method is not overridden.D
If a HashSet contains more than one Person object with name=”Fred”, then removing another person, also with name=”Fred”, will remove them all.
考题
单选题public class Employee{ private String name; public Employee(String name){ this.name = name; } public String getName(){ return name; } } public class Manager extends Employee{ private String department; public Manager(String name,String department){ this.department = department; super(name); System.out.println(getName()); } } 执行语句new Manager(“smith”,”SALES”)后程序的输出是哪项?()A
smithB
nullC
SALESD
编译错误
考题
多选题Which are syntactically valid statement at// point x?() class Person { private int a; public int change(int m){ return m; } } public class Teacher extends Person { public int b; public static void main(String arg[]){ Person p = new Person(); Teacher t = new Teacher(); int i; // point x } }Ai = m;Bi = b;Ci = p.a;Di = p.change(30);Ei = t.b.
考题
单选题1. public class Person { 2. private String name; 3. public Person(String name) { this.name = name; } 4. public boolean equals(Person p) { 5. return p.name.equals(this.name); 6. } 7. } Which is true?()A
The equals method does NOT properly override the Object.equals method.B
Compilation fails because the private attribute p.name cannot be accessed in line 5.C
To work correctly with hash-based data structures, this class must also implement the hashCode method.D
When adding Person objects to a java.util.Set collection, the equals method in line 4 will prevent duplicates.
考题
单选题public class Person { private String name, comment; private int age; public Person(String n, int a, String c) { name = n; age = a; comment = c; } public boolean equals(Object o) { if(! (o instanceof Person)) return false; Person p = (Person)o; return age == p.age name.equals(p.name); } } What is the appropriate definition of the hashCode method in class Person?()A
return super.hashCode();B
return name.hashCode() + age * 7;C
return name.hashCode() + comment.hashCode() /2;D
return name.hashCode() + comment.hashCode() / 2 - age * 3;
考题
多选题Which three demonstrate an “is a” relationship?()Apublic class X { } public class Y extends X { }Bpublic interface Shape { } public interface Rectangle extends Shape{ }Cpublic interface Color { } public class Shape { private Color color; }Dpublic interface Species { } public class Animal { private Species species; }Epublic class Person { } public class Employee { public Employee(Person person) { }Finterface Component { } class Container implements Component { private Component[] children; }
考题
单选题Given the uncompleted code of a class: class Person { String name, department; int age; public Person(String n){ name = n; } public Person(String n, int a){ name = n; age = a; } public Person(String n, String d, int a) { // doing the same as two arguments version of constructor // including assignment name=n,age=a department = d; } } Which expression can be added at the "doing the same as..." part of the constructor?()A
Person(n,a);B
this(Person(n,a));C
this(n,a);D
this(name,age);
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