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单选题
class super { public int getLength() {return 4;} } public class Sub extends Super { public long getLength() {return 5;} public static void main (Stringargs) { super sooper = new Super (); Sub sub = new Sub(); System.out.printIn( sooper.getLength()+ “,” + sub.getLength() }; } What is the output?()
A
4, 4
B
4, 5
C
5, 4
D
5, 5
E
The code will not compile.
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更多 “单选题class super { public int getLength() {return 4;} } public class Sub extends Super { public long getLength() {return 5;} public static void main (Stringargs) { super sooper = new Super (); Sub sub = new Sub(); System.out.printIn( sooper.getLength()+ “,” + sub.getLength() }; } What is the output?()A 4, 4B 4, 5C 5, 4D 5, 5E The code will not compile.” 相关考题
考题
Given:Which code, inserted at line 15, allows the class Sprite to compile?()
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考题
执行下列代码后,输出的结果为( )。 class Base { int x = 30; void setX( ) {x=1O;} } class SubClass extends Base { int x=40; void setX ( ) {x=20;} int getX( ) {return super. x; } } public class Test { public static void main(String[ ] args) { SubClass sub=new SubClass( ); sub. setX( ); System. out. println(sub, getX( ) ); } }A.10B.20C.30D.40
考题
有如下程序: include using namespace std; class Base{ int x; pu
有如下程序: #include<iostream> using namespace std; class Base{ int x; public: Base(int n=0):x(n){cout<<n;) int getX()const{return x;} }; class Derived:public Base{ int y; public: Derived(int m,int n):y(m,)Base(n){cout<<m;} Derived(int m):y(m){cout<<m;} }; int main(){ Derived d1(3),d2(5,7) return 0; }运行时的输出结果是A.375B.357C.375D.357
考题
下面函数的运行结果是( )。 include using namespace std; class A{ pu
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考题
class A { protected int method1(int a, int b) { return 0; } } Which two are valid in a class that extends class A?() A、 public int method1(int a, int b) { return 0; }B、 private int method1(int a, int b) { return 0; }C、 private int method1(int a, long b) { return 0; }D、 public short method1(int a, int b) { return 0: }E、 static protected int method1(int a, int b) { return 0; }
考题
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
class Super { public int getLenght( ) { return 4; } } public class Sub extends Super { public long getLenght( ) { return 5; } public static void main(String[] args) { Super sooper = new Super( ); Sub sub = new Sub( ); System.out.println( sooper.getLenght( ) + “,” + sub.getLenght( ) ); } } What is the output?()A、 Just after line 13.B、 Just after line 14.C、 Just after line 15.D、 Just after line 16 (that is, as the method returns).
考题
Which statements concerning the following code are true?() class a { public a() {} public a(int i) { this(); } } class b extends a { public boolean b(String msg) { return false; } } class c extends b { private c() { super(); } public c(String msg) { this(); } public c(int i) {} } A、The code will fail to compile.B、The constructor in a that takes an int as an argument will never be called as a result of constructing an object of class b or c.C、Class c has three constructors.D、Objects of class b cannot be constructed.E、At most one of the constructors of each class is called as a result of constructing an object of class c.
考题
class super { public float getNum() {return 3.0f;} } public class Sub extends Super { } Which method, placed at line 6, will cause a compiler error?()A、 Public float getNum() {return 4.0f; }B、 Public void getNum (){}C、 Public void getNum (double d){}D、 Public double getNum (float d) {retrun 4.0f; }
考题
class super { public int getLength() {return 4;} } public class Sub extends Super { public long getLength() {return 5;} public static void main (String[]args) { super sooper = new Super (); Sub sub = new Sub(); System.out.printIn( sooper.getLength()+ “,” + sub.getLength() }; } What is the output?() A、 4, 4B、 4, 5C、 5, 4D、 5, 5E、 The code will not compile.
考题
class Super { public int getLenght() { return 4; } } public class Sub extends Super { public long getLenght() { return 5; } public static void main(String[] args) {Super sooper = new Super(); Sub sub = new Sub(); System.out.println( sooper.getLenght() + “,” + sub.getLenght() ); } } What is the output? ()A、 4,4B、 4,5C、 5,4D、 5,5E、 Compilation fails.
考题
现有: 1. class Synapse { 2. protected int gap() { return 7; } 3. } 4. 5. class Creb extends Synapse { 6. // insert code here 7. } 分别插入到第 6 行,哪三行可以编译?()A、 int gap() { return 7; }B、 public int gap() { return 7; }C、 private int gap(int x) { return 7; }D、 protected Creb gap() { return this; }E、 public int gap() { return Integer.getInteger ("42"); }
考题
class One { public One foo() { return this; } } class Two extends One { public One foo() { return this; } } class Three extends Two { // insert method here } Which two methods, inserted individually, correctly complete the Three class?()A、 public void foo() { }B、 public int foo() { return 3; }C、 public Two foo() { return this; }D、 public One foo() { return this; }E、 public Object foo() { return this; }
考题
1. class super { 2. public float getNum() {return 3.0f;} 3. } 4. 5. public class Sub extends Super { 6. 7. } Which method, placed at line 6, will cause a compiler error?() A、 Public float getNum() {return 4.0f; }B、 Public void getNum () { }C、 Public void getNum (double d) { }D、 Public double getNum (float d) {retrun 4.0f; }
考题
1. public class Blip { 2. protected int blipvert(int x) { return 0; } 3. } 4. class Vert extends Blip { 5. // insert code here 6. } Which five methods, inserted independently at line 5, will compile?() A、 public int blipvert(int x) { return 0; }B、 private int blipvert(int x) { return 0; }C、 private int blipvert(long x) { return 0; }D、 protected long blipvert(int x, int y) { return 0; }E、 protected int blipvert(long x) { return 0; }F、 protected long blipvert(long x) { return 0; }G、protected long blipvert(int x) { return 0; }
考题
单选题class Super { public Integer getLenght() { return new Integer(4); } } public class Sub extends Super { public Long GetLenght() { return new Long(5); } public static void main(String[] args) { Super sooper = new Super(); Sub sub = new Sub(); System.out.println( sooper.getLenght().toString() + “,” + sub.getLenght().toString() ); } } What is the output?()A
4,4B
4,5C
5,4D
5,5E
Compilation fails.
考题
多选题Which statements concerning the following code are true?() class a { public a() {} public a(int i) { this(); } } class b extends a { public boolean b(String msg) { return false; } } class c extends b { private c() { super(); } public c(String msg) { this(); } public c(int i) {} }AThe code will fail to compile.BThe constructor in a that takes an int as an argument will never be called as a result of constructing an object of class b or c.CClass c has three constructors.DObjects of class b cannot be constructed.EAt most one of the constructors of each class is called as a result of constructing an object of class c.
考题
单选题10. interface Foo { int bar(); } 11. public class Sprite { 12. public int fubar( Foo foo) { return foo.bar(); } 13. public void testFoo() { 14. fubar( 15. // insert code here 16.); 17. } 18. } Which code, inserted at line 15, allows the class Sprite to compile?()A
Foo { public int bar() { return 1; } }B
new Foo { public int bar() { return 1; } }C
newFoo() { public int bar(){return 1; } }D
new class Foo { public int bar() { return 1; } }
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
单选题1. class super { 2. public float getNum() {return 3.0f;} 3. } 4. 5. public class Sub extends Super { 6. 7. } Which method, placed at line 6, will cause a compiler error?()A
Public float getNum() {return 4.0f; }B
Public void getNum () { }C
Public void getNum (double d) { }D
Public double getNum (float d) {retrun 4.0f; }
考题
单选题class super { public int getLength() {return 4;} } public class Sub extends Super { public long getLength() {return 5;} public static void main (String[]args) { super sooper = new Super (); Sub sub = new Sub(); System.out.printIn( sooper.getLength()+ “,” + sub.getLength() }; } What is the output?()A
4, 4B
4, 5C
5, 4D
5, 5E
The code will not compile.
考题
单选题1. class Super { 2. public float getNum() { return 3.0f; } 3. } 4. 5. public class Sub extends Super { 6. 7. } Which method, placed at line6, causes compilation to fail?()A
public void getNum(){}B
public void getNum(double d){}C
public float getNum() { return 4.0f; }D
public double getNum(float d) { return 4.0d; }
考题
单选题class Super { public int getLenght() { return 4; } } public class Sub extends Super { public long getLenght() { return 5; } public static void main(String[] args) {Super sooper = new Super(); Sub sub = new Sub(); System.out.println( sooper.getLenght() + “,” + sub.getLenght() ); } } What is the output? ()A
4,4B
4,5C
5,4D
5,5E
Compilation fails.
考题
单选题class super { public float getNum() {return 3.0f;} } public class Sub extends Super { } Which method, placed at line 6, will cause a compiler error?()A
Public float getNum() {return 4.0f; }B
Public void getNum (){}C
Public void getNum (double d){}D
Public double getNum (float d) {retrun 4.0f; }
考题
多选题1. class Super { 2. private int a; 3. protected Super(int a) { this.a = a; } 4. } ..... 11. class Sub extends Super { 12. public Sub(int a) { super(a); } 13. public Sub() { this.a= 5; } 14. } Which two, independently, will allow Sub to compile?()AChange line 2 to: public int a;BChange line 2 to: protected int a;CChange line 13 to: public Sub() { this(5); }DChange line 13 to: public Sub() { super(5); }EChange line 13 to: public Sub() { super(a); }
考题
多选题public class Car { private int wheelCount; private String vin; public Car(String vin) { this.vin = vin; this.wheelCount = 4; } public String drive() { return “zoom-zoom”; } public String getInfo() { return “VIN: “+ vin + “wheels: “+ wheelCount; } } And: public class MeGo extends Car { public MeGo(String vin) { this.wheelCount = 3; } } What two must the programmer do to correct the compilation errors?()Ainsert a call to this() in the Car constructorBinsert a call to this() in the MeGo constructorCinsert a call to super() in the MeGo constructorDinsert a call to super(vin) in the MeGo constructorEchange the wheelCount variable in Car to protectedFchange line 3 in the MeGo class to super.wheelCount = 3;
考题
单选题class Super { public int getLenght( ) { return 4; } } public class Sub extends Super { public long getLenght( ) { return 5; } public static void main(String[] args) { Super sooper = new Super( ); Sub sub = new Sub( ); System.out.println( sooper.getLenght( ) + “,” + sub.getLenght( ) ); } } What is the output?()A
Just after line 13.B
Just after line 14.C
Just after line 15.D
Just after line 16 (that is, as the method returns).
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