多选题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?()Apublic int blipvert(int x) { return 0; }Bprivate int blipvert(int x) { return 0; }Cprivate int blipvert(long x) { return 0; }Dprotected long blipvert(int x, int y) { return 0; }Eprotected int blipvert(long x) { return 0; }Fprotected long blipvert(long x) { return 0; }Gprotected long blipvert(int x) { return 0; }

多选题
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; }


参考解析

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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; }

1. class BaseClass {  2. private float x = 1.of;  3. protected float getVar() { return x; }  4. }  5. class SubClass extends BaseClass {  6. private float x = 2.Of;  7. // insert code here 8. }   Which two are valid examples of method overriding when inserted at line 7?() A、 float getVar() { return x; }B、 public float getVar() { return x; }C、 public double getVar() { return x; }D、 protected float getVar() { return x; }E、 public float getVar(float f) { return f; }

1. public class Target {  2. private int i = 0;  3. public int addOne() {  4. return ++i;  5. }  6. }  And:  1. public class Client {  2. public static void main(String[] args) {  3. System.out.println(new Target().addOne());  4. }  5. }  Which change can you make to Target without affecting Client?() A、 Line 4 of class Target can be changed to return i++;B、 Line 2 of class Target can be changed to private int i = 1;C、 Line 3 of class Target can be changed to private int addOne() {D、 Line 2 of class Target can be changed to private Integer i = 0;

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10. public class Bar {  11.static void foo(int...x) {  12. // insert code here  13. }  14. }  Which two code fragments, inserted independently at line 12, will allow the class to compile?()A、 foreach(x) System.out.println(z);B、 for(int z : x) System.out.println(z);C、 while( x.hasNext()) System.out.println( x.next());D、 for( int i=0; i x.length; i++ ) System.out.println(x[i]);

1.class SuperFo{   2. SuperFo doStuff(int x){   3.return new SuperFo()   4.}   5.}  6.   7.class Foo extends SuperFo{   8.//insert code here   9.}   和四个声明:   Foo doStuff(int x){return new Foo();}   Foo doStuff(int x){return new SuperFoo();}   SuperFoo doStuff(int x){return new foo();}   SuperFoo doStuff(int y){return new SuperFoo();}   分别插入到第8行,有几个可以通过编译 ()A、1B、2C、3D、4E、5

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?()A、 Change line 2 to: public int a;B、 Change line 2 to: protected int a;C、 Change line 13 to: public Sub() { this(5); }D、 Change line 13 to: public Sub() { super(5); }E、 Change line 13 to: public Sub() { super(a); }

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; } }

1. class Over{   2. int doIt(long x) { return 3;}   3. }   4.   5. class Under extends Over{   6. //insert code here 7. }   和四个方法:   short doIt(int y) {return 4;}   int doIt(long x,long y){return 4;}   private int doIt(Short y){ return 4;}   protected int doIt(long x){return 4;}   分别插入到第6行,有几个可以通过编译?()  A、2B、3C、4D、0E、1

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多选题Given: Which five methods, inserted independently at line 5, will compile?()Aprotected int blipvert(long x) { return 0; }Bprotected long blipvert(int x) { return 0; }Cprivate int blipvert(long x) { return 0; }Dprivate int blipvert(int x) { return 0; }Epublic int blipvert(int x) { return 0; }Fprotected long blipvert(long x) { return 0; }Gprotected long blipvert(int x, int y) { return 0; }

多选题class A {  protected int method1(int a, int b) { return 0; }  }  Which two are valid in a class that extends class A?()Apublic int method1(int a, int b) { return 0; }Bprivate int method1(int a, int b) { return 0; }Cprivate int method1(int a, long b) { return 0; }Dpublic short method1(int a, int b) { return 0: }Estatic protected int method1(int a, int b) { return 0; }

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多选题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?()Apublic void foo() { }Bpublic int foo() { return 3; }Cpublic Two foo() { return this; }Dpublic One foo() { return this; }Epublic Object foo() { return this; }

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