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public class Pet{ private String name; public Pet(){ System.out.print(1); } public Pet(String name){ System.out.print(2); } } public class Dog extends Pet{ public Dog(){ System.out.print(4); } public Dog(String name){ super(name); System.out.print(3); } } 执行new Dog(“棕熊”);后程序输出是哪项?()
- A、 33
- B、 13
- C、 23
- D、 123
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更多 “ public class Pet{ private String name; public Pet(){ System.out.print(1); } public Pet(String name){ System.out.print(2); } } public class Dog extends Pet{ public Dog(){ System.out.print(4); } public Dog(String name){ super(name); System.out.print(3); } } 执行new Dog(“棕熊”);后程序输出是哪项?() A、 33B、 13C、 23D、 123” 相关考题
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如下程序的输出结果是______。 include using namespace std; class Pet{ char nam
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有如下程序: include using namespace std; class Pet{ char name[10]; public: Pet(c
有如下程序:include<iostream>using namespace std;class Pet{char name[10];public:Pet(char*name){strcpy(this->name,name);}const char*getName()const {return name;}virtual void call()const=0;};class Dog:public Pet{public:Dog(char*name):Pet(name){}void call()const{cout<<"汪汪叫":}};class Cat:public Pet{public:Cat(char*name):Pet(name){}void call()const{cout<<"喵喵叫";}};int main(){Pet*pet1=new Dog("哈克"),*pet2=new Cat("吉米");cout<<pet1->getName();pet1->call();cout<<end1;cout<<pet2->getName();pet2->call();cout<<end1;return 0;}程序的输出结果是______。
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public class Pet{ private String name; public Pet(){ System.out.print(1); } public Pet(String name){ System.out.print(2); } } public class Dog extends Pet{ public Dog(String name){ System.out.print(3); } } 执行new Dog(“棕熊”);后程序输出是哪项?() A、 23B、 13C、 123D、 321
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Which two allow the class Thing to be instantiated using new Thing()?A、 public class Thing { }B、 public class Thing { public Thing() {} }C、 public class Thing { public Thing(void) {} }D、 public class Thing { public Thing(String s) {} }E、 public class Thing { public void Thing() {} public Thing(String s) {} }
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public class Pet{ private String name; public Pet(){ System.out.print(1); } public Pet(String name){ System.out.print(2); } } public class Dog extends Pet{ public Dog(String name){ //这里隐藏了一句代码:super.pet(); System.out.print(3); } } 执行new Dog(“棕熊”);后程序输出是哪项?() A、 23B、 1 3C、 123D、 321
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现有: public class Pet() public class Cat extends Pet{) 执行代码 Cat c- new Cat(); Pet p= (Pet)c; 后下列哪项是正确的?() A、 Pet p=(Pet)c运行错误B、 Pet p=(Pet)c编译错误C、 Pet p= (Pet)c止常执行D、以上都不对
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public class Pet{ private String name; public Pet(){ System.out.print(1); } public Pet(String name){ System.out.print(2); } } public class Dog extends Pet{ public Dog(){ System.out.print(4); } public Dog(String name){ //这里隐藏了一句代码:super.pet(); this(); System.out.print(3); } } 执行new Dog(“棕熊”);后程序输出是哪项?() A、 143B、 423C、 243D、 1134
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What produces a compiler error?() A、 class A { public A(int x) {} }B、 class A {} class B extends A { B() {} }C、 class A { A() {} } class B { public B() {} }D、 class Z { public Z(int) {} } class A extends Z {}
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public class Pet{ public void speak(){ System.out.print(“ Pet ”); } } public class Cat extends Pet{ public void speak(){ System.out.print(“ Cat ”); } } public class Dog extends Pet{ public void speak(){ System.out.print(“ Dog ”); } } 执行代码 Pet[] p = {new Cat(),new Dog(),new Pet()}; for(int i=0;i〈p.length;i++) p[i].speak(); 后输出的内容是哪项?() A、Pet Pet PetB、Cat Cat CatC、Cat Dog PetD、Cat Dog Dog
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单选题public class Pet{ private String name; public Pet(){ System.out.print(1); } public Pet(String name){ System.out.print(2); } } public class Dog extends Pet{ public Dog(){ System.out.print(4); } public Dog(String name){ super(name); System.out.print(3); } } 执行new Dog(“棕熊”);后程序输出是哪项?()A
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以上都不对
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Cat Dog PetD
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单选题public class SomeException { } Class a: public class a { public void doSomething() { } } Class b: public class b extends a { public void doSomething() throws SomeException { } } Which is true about the two classes?()A
Compilation of both classes will fail.B
Compilation of both classes will succeed.C
Compilation of class a will fail. Compilation of class b will succeed.D
Compilation of class a will fail. Compilation of class a will succeed.
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多选题Which two allow the class Thing to be instantiated using new Thing()?Apublic class Thing { }Bpublic class Thing { public Thing() {} }Cpublic class Thing { public Thing(void) {} }Dpublic class Thing { public Thing(String s) {} }Epublic class Thing { public void Thing() {} public Thing(String s) {} }
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单选题public class Pet{ private String name; public Pet(){ System.out.print(1); } public Pet(String name){ System.out.print(2); } } public class Dog extends Pet{ public Dog(String name){ //这里隐藏了一句代码:super.pet(); System.out.print(3); } } 执行new Dog(“棕熊”);后程序输出是哪项?()A
23B
1 3C
123D
321
考题
单选题public class Pet{ private String name; public Pet(String name){ this.name = name; } public void speak(){ System.out.print(name); } } public class Dog extends Pet{ public Dog(String name){ super(name); } public void speak(){ super.speak(); System.out.print(“ Dog ”); } } 执行代码 Pet pet = new Dog(“京巴”); pet.speak(); 后输出的内容是哪项?()A
京巴B
京巴 DogC
nullD
Dog京巴
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单选题What produces a compiler error?()A
class A { public A(int x) {} }B
class A {} class B extends A { B() {} }C
class A { A() {} } class B { public B() {} }D
class Z { public Z(int) {} } class A extends Z {}
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