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).

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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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; }

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;

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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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; }

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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.

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; }

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); }

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;

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).