Move the line 12 print statement into the foo() method.
Change line 7 to public synchronized void go() {.
Change the variable declaration on line 3 to private volatile int x;.
Wrap the code inside the foo() method with a synchronized( this ) block.
Wrap the for loop code inside the go() method with a synchronized block synchronized(this) { // for loop code here }.
第1题:
若有以下程序: #include <iostream> using namespace std; class data { public: int x; data (int x) { data: :x=x; } }; class A { private: data d1; public: A(int x) : d1 (x) { } void dispa() { cout<<d1, x<<", "; } }; class B: public A { private: data d2; public: B(int x) : A(x-1),d2(x) {} void dispb() { cout<<d2.x<<end1; } }; class C : public B { public: C(int x) : B(x-1){} void disp () { dispa ( ); dispb (); } }; int main ( ) { C obj (5); obj.disp(); return 0; } 程序执行后的输出结果是( )。
A.5,5
B.4,5
C.3,4
D.4,3
第2题:
若有以下程序: #include <iostream> using namespace std; class A { private: int a; public: void seta(int x) { a=x; } void showa() { cout<<a<<","; } }; class B { private: int b; public: void setb (int x) { b=x; } void showb() { cout<<b<<","; } }; class C :public A,private B { private: int c; public: void setc(int x, inc y, int z) { c=z; seta (x); setb (y); } void showc() { showa (); showb (); cout<<c<<end1; } }; int main () { C c; c. setc(1,2,3); c.showc(); return 0; } 程序执行后的输出结果是
A.1,2,3
B.1,1,1
C.2,2,2
D.3,3,3
第3题:
若有以下程序:#include <iostream>using namespace std;class A{private: int a;public: void seta(int x) { a=x; } void showa() { cout<<a<<","; }};class B{private: int b;public: void setb(int x) { b=x; } void showb() { cout<<b<<","; }};class C: public A, private B{private: int c;public: void setc(int x, int y, int z) { c=z; seta(x); setb(y); } void showc() { showa(); showb(); cout<<c<<end1; }};int main(){ C c; c.setc(1,2,3); c.showc(); return 0;}程序执行后的输出结果是( )。
A.1,2,3
B.1,1,1
C.2,2,2
D.3,3,3
第4题:
下列类的定义中,有( )处语法错误。 class Base { public: Base(){} Base(int i) { data=i; } private: int data; }; class Derive : public Base { public: Derive() : Base(O) {} Derive (int x) { d=x; } void setvalue(int i) { data=i; } private: int d; };
A.1
B.2
C.3
D.4
第5题:
若有以下程序:#include<iostream>using namespace std;class A {private: int x;public: int z; void setx(int i) { x=i; } int getx () { return x; }}:class B : public A{private: int m;public: int p; void setvalue(int a, int b, int c) { setx(a) ; z=b; m=c; } void display{) { cout<<getx ()<<", "<<z<<", "<<m<<end1; }};int main(){ B obj; obj. setvalue(2,3,4); obj.display(); return 0;} 程序运行以后的输出结果是
A.产生语法错误
B.2,3,4
C.2,2,2
D.4,3,2
第6题:
class Foo { private int x; publicFoo(intx) {this.x=x; } public void setX( int x) { this.x = x; } public int getX() { return x; } } public class Gamma { static Foo fooBar( Foo foo) { foo = new Foo( 100); return foo; } public static void main( String[] args) { Foo foo = new Foo( 300); System.out.print( foo.getX() + “-“); Foo fooFoo = fooBar( foo); System.out.print( foo.getX() + “-“); System.out.print( fooFoo.getX() + “-“); foo = fooBar( fooFoo); System.out.print( foo.getX() + “-“); System.out.prmt( fooFoo.getX()); } } What is the output of this program?()
第7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?()
第8题:
public class Foo { public int a; public Foo() { a = 3; } public void addFive() { a += 5; } } and: public class Bar extends Foo { public int a; public Bar() { a = 8; } public void addFive() { this.a +=5; } } invoked with: Foo foo = new Bar(); foo.addFive(); System.out.println(”Value: “+ foo.a); What is the result?()
第9题:
Value: 3
Value: 8
Value: 13
Compilation fails.
The code runs with no output.
An exception is thrown at runtime.
第10题:
public class Circle implements Shape { private int radius; }
public abstract class Circle extends Shape { private int radius; }
public class Circle extends Shape { private int radius; public void draw(); }
public abstract class Circle implements Shape { private int radius; public void draw(); }
public class Circle extends Shape { private int radius;public void draw() {/* code here */} }
public abstract class Circle implements Shape { private int radius;public void draw() { / code here */ } }
第11题:
(a ==c)
(d ==e)
(b ==d)
(a ==b)
(b ==c)
(d ==10.0)
第12题:
X
y
j
i
第13题:
若有以下程序: #include<iostream> using namespace std; class A { private: int a; public: void seta(int x) { a=x; } void showa() { cout<<a<<","; } }; class B { private: int b; public: void setb(int x) { b=x; } void showb() { cout<<b<<",”; } }; class C:pUblic A,private B { private: int c; public: void setc(int x,int y,int z) { c=z; seta(x); setb(y); } void showc() { showa(); showb(); cout<<c<<end1; } }; int main() { Cc; c.setc(1,2,3); c.showc(); retrun 0; } 程序执行后的输出结果是
A.1,2,3
B.1,1,1
C.2,2,2
D.3,3,3
第14题:
若有以下程序: #include <iostream> using namespace std; class A { private: int a; public: A(int i) { a=i; } void disp () { cout<<a<<","; } }; class B { private: int b; public: B(int j) { b=j; } void disp () { cout<<b<<","; } }; class C : public B,public A { private: int c; public: C(int k):A(k-2),B(k+2) { c=k; } void disp () { A::disp(); B::disp(); cout<<c<<endl; } }; int main() { C obj(10); obj.disp(); return 0; }
A.10,10,10
B.10,12,14
C.8,10,12
D.8,12,10
第15题:
若有以下程序: #include <iostream> using namespace std; class data public: int x; data(int x) { data: :x=x; }; class A private: data d1; public: A(int x): d1(x){} void dispa() { cout<<d1.x<<","; } }; class B: public A { private: data d2; public: B(int x): A(x-1),d2(x){} void dispb() { cout<<d2.x<<end1; } }; class C: public B { public: C(int x): B(x-1){} void disp() { dispa(); dispb(); } }; int main() { C obj(5); obj.disp(); return 0; 程序执行后的输出结果是 }
A.5,5
B.4,5
C.3,4
D.4,3
第16题:
若有以下程序: #include<iostream> using namespace std; class data { public: int x; data(int x) { data::x=x; } }; class A { private: data d1; public: A(int x):d1(x){} void dispa() { cout<<d1.X<<","; } }; classB:public A { private: data d2; public: B(int x):A(x-1),d2(x){} void dispb() { cout<<d2.x<<end1; } }; class C:public B { public: C(int x):B(x-1){} void disp() { dispa(); dispb(); } }; int main() { C obj(5); obj.disp(); return 0; } 程序执行后的输出结果是
A.5,5
B.4,5
C.3,4
D.4,3
第17题:
class One { void foo() {} } class Two extends One { //insert method here } Which three methods, inserted individually at line 14, will correctly complete class Two?()
第18题:
public class X { public X aMethod() { return this;} } public class Y extends X { } Which two methods can be added to the definition of class Y?()
第19题:
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?()
第20题:
public abstract class Shape { private int x; private int y; public abstract void draw(); public void setAnchor(int x, int y) { this.x = x; this.y = y; } } Which two classes use the Shape class correctly?()
第21题:
Foo { public int bar() { return 1; } }
new Foo { public int bar() { return 1; } }
newFoo() { public int bar(){return 1; } }
new class Foo { public int bar() { return 1; } }
第22题:
protected void change(int x){}
public void change(int x, int y){}
public void change(String s){}
public void change(int x){}
第23题:
Move the line 12 print statement into the foo() method.
Change line 7 to public synchronized void go() {.
Change the variable declaration on line 3 to private volatile int x;.
Wrap the code inside the foo() method with a synchronized( this ) block.
Wrap the for loop code inside the go() method with a synchronized block synchronized(this) { // for loop code here }.
第24题:
x
y
i
j