单选题class Account { private int balance; public void setBalance(int b) { balance = b; } public int getBalance() { return balance; } public void clearBalance() { balance = 0; } } 哪一个改变可以使 Account 类线程安全?()A在第2行加 synchronized 修饰符。B在第3行加 synchronized 修饰符。C在第3行、第4行和第6行加 synchronized 修饰符。D在第4行、第6行和第8行加 synchronized 修饰符。
单选题
class Account { private int balance; public void setBalance(int b) { balance = b; } public int getBalance() { return balance; } public void clearBalance() { balance = 0; } } 哪一个改变可以使 Account 类线程安全?()
A
在第2行加 synchronized 修饰符。
B
在第3行加 synchronized 修饰符。
C
在第3行、第4行和第6行加 synchronized 修饰符。
D
在第4行、第6行和第8行加 synchronized 修饰符。
参考解析
解析:
暂无解析
相关考题:
请在mian函数中填空使下面程序的输出结果为1 1。 include class A { private: 请在mian函数中填空使下面程序的输出结果为1 1。include<iostream.h>class A{ private:int a;int b;public:A( ):a(0) ,b(1) { }void show( ) { cout < < a < < " " < < b;} };class B{ private:int a;int c;public:B( ):a(1),
有以下程序:includeusing namespace std;class A{private:int a;public:A(int i){a=i 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<<“,”;A.10,10,10B.10,12,14C.8,10,12D.8,12,10
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: d; };A.1B.2C.3D.4
下面这个程序的结果是includeclass A{private:int a;public:void seta();int geta( 下面这个程序的结果是 #include<iostream.h> class A { private: int a; public: void seta();int geta();}; void A∷seta() {a=1;} int A∷geta() {return a;} class B { pnvate: int a; publiC: void sera();int geta();}; void B∷seta() {a = 2;} int B∷geta() {return a;} class C:public A,public B { private: int b; public: void display();}; void C∷display() { int b=geta(); cout<<b;} void main() { C c; c.seta(); c.display();}A.1B.2C.随机输出1或2D.程序有错
已知如下类定义: class Base { public Base (){ //... } public Base ( int m ){ //... } protected void fun( int n ){ //... } } public class Child extends Base{ // member methods } 如下哪句可以正确地加入子类中?() A.private void fun( int n ){ //...}B.void fun ( int n ){ //... }C.protected void fun ( int n ) { //... }D.public void fun ( int n ) { //... }
若有以下程序 include using namespace std; class A {private:int a; public: A(in 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<<end1; } }; int main() { C obj(10); obj.disp(); return 0; } 程序执行后的输出结果是A.10,10,10B.10,12,14C.8,10,12D.8,12,10
以下程序的执行结果是【】。include class B{public:B(){}B(int i.int j); void printb 以下程序的执行结果是【 】。include <iostream.h>class B{public:B(){}B(int i.int j);void printb();private:int a,b;};class A{public:A() { }A(int i,int j);void printa();private:B c;};A:: A(int i,int j):c(i, j){ }void A:: pfinta(){c. printb();}B::B(int i,int j){a=i;b=j;}void B::printb(){cout<<"a="<<a<<",b="<<b<<end1;}void main(){A m(7,9);m. printa();}
下面这个程序的结果是 include class A { private: int a; public: void seta( ) ; 下面这个程序的结果是#include<iostream.h>class A{private:int a;public:void seta( ) ;int geta( ) ;};void A: :seta( ){ a=1;}int A: :geta( ){ retum a;}class B{ private:int a;public:void seta( ) ;int geta( ) ;};void B: :seta( ){a=2;}int B: :geta( ){return a;}class C: public A,public B{ private:int b;public:void display( ) ;};void C: :display( ){ int b=geta( ) ;cout < < b;}void main( ){ C c;c. seta( ) ;c. display( ) ;}A.1B.2C.随机输出1或2D.程序有错
有以下程序:include using namespace std;class A{private:int a;public:A (int i){a 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 obi (10); obj.disp (); return 0; } 程序执行后的输出结果是A.10,10,10B.10,12,14C.8,10,12D.8,12,10
若有以下程序:include using namespace std;class A{private:int a;public:A(im i){a 若有以下程序: #include <iostream> using namespace std; class A { private: int a; public: A(im i) { a=i; } void disp() cout<<a<<","; } }; class B { private: int b; public: B(int j) { b=j; } void disp0 { cout<<b<<","; } }; class C: public B,public A { private: int c; public: C(int k):A(k-2),B(k+2) { c=k; } void disp0 { A::disp(); B::disp(); cout<<c<<endl; } }; int main() { C obj(10); obj.disp(); return 0; } 程序执行后的输出结果是( )。A.10,10,10B.10,12,14C.8,10,12D.8,12,10
下面程序的打印结果是【】。 include using namespace std; class Base { public:Base(i 下面程序的打印结果是【 】。include <iostream>using namespace std;class Base{public:Base(int x){a=x;}void show(){cout<<a;}private:int a;};class Derived : public Base{public:Derived(int i) :Base(i+1) ,b(i) { }void show(){cout<<b;}private:int b;};int main ( ){Base b(5) , *pb;Derived d(1);pb=d;pb->show();return 0;}
若有以下程序:includeusing namespace std;class A{private:int a; public:void seta 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.1,2,3B.1,1,1C.2,2,2D.3,3,3
类class one 在声明func 成员函数时发生错误,出错原因是【 】。Class one{private:int a;public:void func(two )};class two{private:int b;friend void one: :func(two );};void one: : func(two r)a=r.b;}
若有以下程序:includeusing namespace std;class A{private:inta;public:voidseta(in 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.1,2,3B.1,1,1C.2,2,2D.3,3,3
若有以下程序:include using namespace std;class A{private:int a;public:A(int i){ 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.10,10,10B.10,12,14C.8,10,12D.8,12,10
若有以下程序:include using namespace std;class A{private:int a;public:void seta 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.1,2,3B.1,1,1C.2,2,2D.3,3,3
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.1B.2C.3D.4
若有以下程序:includeusing namespace std;class A{private:int x;public:int z;void 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.2,3,4C.2,2,2D.4,3,2
若有以下程序:include using namespace std;class A{private: int a;public: A(int 若有以下程序: #include <iost ream> using namespace std; class A { private: int a; public: A(int i) { a=i; } void disp () { cout<<a<<", "; } }; class B { private:A.10,10,10B.10,12,14C.8,10,12D.8,12,10
class Account { private int balance; public void setBalance(int b) { balance = b; } public int getBalance() { return balance; } public void clearBalance() { balance = 0; } } 哪一个改变可以使 Account 类线程安全?() A、在第2行加 synchronized 修饰符。B、在第3行加 synchronized 修饰符。C、在第3行、第4行和第6行加 synchronized 修饰符。D、在第4行、第6行和第8行加 synchronized 修饰符。
Which lines of code are valid declarations of a native method when occurring within the declaration of the following class?() public class Qf575 { // insert declaration of a native method here } A、native public void setTemperature(int kelvin);B、private native void setTemperature(int kelvin);C、protected int native getTemperature();D、public abstract native void setTemperature(int kelvin);E、native int setTemperature(int kelvin) {}
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?()A、 void setVar (int a, int b, float c){ x = a; y = b; z = c; }B、 public void setVar(int a, float c, int b) { setVar(a, b, c); }C、 public void setVar(int a, float c, int b) { this(a, b, c); }D、 public void setVar(int a, float b){ x = a; z = b; }E、 public void setVar(int ax, int by, float cz) { x = ax; y = by; z = cz; }
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?()A、 public class Circle implements Shape { private int radius; }B、 public abstract class Circle extends Shape { private int radius; }C、 public class Circle extends Shape { private int radius; public void draw(); }D、 public abstract class Circle implements Shape { private int radius; public void draw(); }E、 public class Circle extends Shape { private int radius;public void draw() {/* code here */} }F、 public abstract class Circle implements Shape { private int radius;public void draw() { / code here */ } }
多选题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?()Apublic class Circle implements Shape { private int radius; }Bpublic abstract class Circle extends Shape { private int radius; }Cpublic class Circle extends Shape { private int radius; public void draw(); }Dpublic abstract class Circle implements Shape { private int radius; public void draw(); }Epublic class Circle extends Shape { private int radius;public void draw() {/* code here */} }Fpublic abstract class Circle implements Shape { private int radius;public void draw() { / code here */ } }
多选题现有: public class TestDemo{ private int X-2; static int y=3; public void method(){ final int i=100; int j =10; class Cinner { public void mymethod(){ //Here } } } } 在Here处可以访问的变量是哪些?()AXByCjDi
多选题public class TestDemo{ private int x = 2; static int y = 3; public void method(){ final int i=100; int j = 10; class Cinner{ public void mymethod(){ //Here } } } } 在Here处可以访问的变量是哪些?()AxByCiDj