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以下的程序的执行结果为? () public class Demo{ public double getHeight(){ return 171.0; } public int getHeight (){ return 171; } public static void main(String[] args){ Demo demo = new Demo(); System.out.println(demo.getHeight()); } }
A . 输出171.0
B . 输出171
C . 第2行和第5行编译报错
D . 第10行编译报错
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以下程序运行时输入:java Cycle hello two me 2public class Cycle{public static void main(String args[]){System.out.println(args[1]);}}则运行结果为?
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以下程序的运行结果为:1. public class Conditional {2. public static void main(String args [] ) {3. int x = 4;4. System.out.println( \value is \ +5. ((x > 4) ? 99.99 : 9));6. }7. }
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以下程序运行时输入:java Test3 12 34public class Test3 {public static void main(String x[]){System.out.println(x[0] + x[1]);}}则运行结果为?
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有如下程序:include<iostream>using namespace std;class MyClass{public:MyClass(int x):val(x
有如下程序: include<iostream> using namespace std; class MyClass{ public: MyClass(int x):val(x){} void Print()const{cout<<“const:val=”<<<val<<‘\’;} void Print(){cout<<“val=”<<val<<‘t’;} private: int va1; }; int main(){ cons
A.val=10 const:val=20
B.const:val=10 const:val=20
C.const:val=10 val=20
D.val=10 val=20
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有如下程序:include<iostream>using namespace std;class sample{private:int x,y;public:sampl
有如下程序: include<iostream> using namespace std; class sample { private: int x,y; public: sample(int i,int j) { x=i; y=j; } void disp() { cout<<"disp1"<<endl; } void disp()const { cout<<"disp2"<<endl; } }; int main() { const sample a(1,2); a.disp(); return 0; } 该程序运行后的输出结果是()。
A.disp1
B.disp2
C.disp1 disp2
D.程序编译时出错
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若有以下程序:include<iostream>using namespace std;class A{private:int a;public:A(int i){a
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<<
A.10,10,10
B.10,12,14
C.8,10,12
D.8,12,10
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如果在Main.java 中撰写以下程序代码:public class Main { public static void main(string[] args) { System.out.println("Hello World"); } } 以下描述正确的是()
A.执行时显示Hello World
B.执行时出现NoClassDefFoundError
C.执行时出现找不到主要方法的错误
D.编译失败
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有如下程序:includeusing namespace std;Class Test{public:Test(){}Test(const Test&t){co
有如下程序: include using namespace std; Class Test{ public: Test(){} Test(const Test&t){cout<<1;} ); Test fun(Test &u){Test t=u;retum t;} int main(){Test X,y;x=fun(y);retum 0;} 运行这个程序的输出结果是()。
A.无输出
B.1
C.11
D.111
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以下程序代码能否通过编译,如果通过编译,运行“ java Sample ”时会出现什么情况 public class Sample{ private static final int var; Sample(); }}
A.编译时出错:在构造方法中不允许给staticfinal类型的成员变量赋值。
B.编译时出错:main方法中无法访问private类型的变量var。
C.运行时出错:变量var没有被初始化。
D.运行时打印“Value is: 1”。
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有如下程序:include<iostream>using namespace std;class A {public:A(){cout<<"A";}};classB{p
有如下程序: include<iostream> using namespace std; class A { public: A(){cout<<"A";} }; classB{public:B(){cout<<"B";}} classC:public A{ B b; public: C(){cout<<"C";} }; int main(){ C obj; return 0;} 执行后的输出结果是()。
A.CBA
B.BAC
C.ACB
D.ABC
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有如下程序:include<iostream>using namespace std;class BASE{public:~BASE(){cout<<"BASE";}
有如下程序: include<iostream> using namespace std; class BASE{ public: ~BASE(){cout<<"BASE";} }; class DERIVED:public BASE{ public: ~DERIVED(){cout<<"DERIVED";} }; int main(){DERIVED x;return 0;} 程序的输出结果是
A.BASE
B.DERIVED
C.BASEDERIVED
D.DERIVEDBASE
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有如下程序:include<iostream>using namespace std;class GA{public:virtual int f(){return 1
有如下程序: include<iostream> using namespace std; class GA{ public: virtual int f(){return 1;} }; class GB:public GA{ public: virtual int f(){return 2;} }; void show(GA g){eout<<g.f();} void display(GA&g){cout<<g.f();} int main(){ GA a;show(A) ;display(A) ; GB b;show(B) ;display(B) ; return 0; } 程序的输出结果是
A.1111
B.1211
C.1112
D.1212
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有如下程序:include<iostream>using namespace std;class A{public:A(){cout<<"A";}~A(){cout<<
有如下程序: include<iostream> using namespace std; class A { public: A(){cout<<"A";} ~A(){cout<<"~A";} }; class B:public A { A*p; public: B(){cout<<"B";p=new A;} ~B(){cout<<"~B";delete p;} }; int main() { B obj; return 0; } 执行这个程序的输出结果是()。
A.BAA~A~B~A
B.ABA~B~A~A
C.BAA~B~A~A
D.ABA~A~B~A
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有如下程序include<iostream>using namespace std;class base{public:virtual void f1(){cout<<
有如下程序 include<iostream> using namespace std; class base { public: virtual void f1() { cout<<"F1Base"; } virtual void f2() { cout<<"F2Base"; } }; class derive:public base { void f1() { cout<<"F1 Derive"; } void f2(int x) { cout<<"F2 Derive"; } }; int main() { base obj1,*p; derive obj2; p=& obj2; p->f1(); p->f2(); return (); ) 执行后的输出结果是()。
A.F1Derive F2Base
B.F1Derive F2Derive
C.F1Base F2Base
D.F1Base F2Derive
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有以下程序:include<iostream>using namespace std;class sample{private:int n;public:sample(
有以下程序: include<iostream> using namespace std; class sample { private: int n; public: sample(){} sample(int m) { n=m; } sample add(sample s1,sample s2) { this->n=s1.n+s2.n; return(*this); } void disp() { cout<<"n"<<n<<end1; } }; int main() { sample s1(10),s2(5),s3; s3.add(s1,s2); s3.disp(); return 0; } 程序运行后,输出的结果是
A.n=10
B.n=5
C.n=20
D.n=15
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若有如下程序:include<iostream>using namespace std;class TestClass{public:void who() {cout
若有如下程序: include<iostream> using namespace std; class TestClass { public: void who() {cout<<"TestClass"<<endl;} }; class TestClass1:public TestClass { public: void who(){cout<<"TestClass1"<<endl;} }; int main() { TestClass *p; TcstClass1 obj1; p=&obj1; p->who(); return 0; } 则该程序运行后的输出结果是()。
A.TestClass1
B.TestClass
C.0
D.无输出
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以下程序的执行结果为()。include<iostream.h>Class sample{ int n;public: sample(int i){n=i;}
以下程序的执行结果为()。 include<iostream.h> Class sample { int n; public: sample(int i){n=i; } operator ++() { n++; } void display() {cout<<n<<end1; } }; void main() { sample obj(5); obj++;
A.5
B.6
C.7
D.8
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有如下程序:include <iostream>using namespace std;class BASE{public:~BASE(){cout<<"BASE";}
有如下程序:include <iostream>using namespace std;class BASE{public: ~BASE(){cout<<"BASE";}};class DERIVED: public BASE{public: ~DERIVED(){ cout<<"DERIVED"; }int main() { DERIVED x; return 0; }执行后的输出结果是()。
A.BASE
B.DERIVED
C.BASEDERIVED
D.DERIVEDBASE
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有如下程序:include<iostream>using namespace std;class Test{public:Test(){n+=2;}~Test(){n-
有如下程序: include<iostream> using namespace std; class Test{ public: Test() {n+=2;} ~Test() {n-=3;} static int getNum(){return n;} private: static int n; }; int Test::n=1; int main() { Test* p=new Test; delete p; cout<<"n="<<Test::getNum()<<endl; return0; } 执行后的输出结果是()。
A.n=0
B.n=1
C.n=2
D.n=3
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以下程序的执行结果是()class Guy {public Guy(){System.out.print(“111,”);}}class Cowboy extends Guy {public Cowboy(){System.out.print(“222,”);}}class Wrangler extends Cowbo
A.111,111,222,111,222,333
B.111,222,333
C.111,111,222,222,333
D.编译不通过
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以下程序段输出的结果是() public class Test{ public static void main(String[] args) { String str=”ABCDE”; str.substring(3); str.concat(“XYZ”); System.out.println(str); } }
A.DE
B.DEXYZ
C.ABCDE
D.CDEXYZ
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以下Java程序的运行结果是()。public class Increment{public static void main(String args[]
A. 222
B. 233
C. 223
D. 345
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给定以下程序段insert code public class foo {public static void main (String[] args) thro
给定以下程序段insert code public class foo {public static void main (String[] args) throws Exception {printWriter ut = new PrintWriter (new java.io.outputStreamWriter (System.out), true) ;out.printIn(“Hello”);}要使程序能正确运行,在insert code处必须添加()语句。
A、include java.io.OutputStreamWriter;
B、import java.io.OutputStreamWriter;
C、import java.io.PrintWriter;
D、include java.io.PrintWriter