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多选题
abstract class A { abstract void al(); void a2() { } } class B extends A { void a1() { } void a2() { } } class C extends B { void c1() { } } and: A x = new B(); C y = new C(); A z = new C(); Which four are valid examples of polymorphic method calls?()
A
x.a2();
B
z.a2();
C
z.c1();
D
z.a1();
E
y.c1();
F
x.a1();
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public class Employee implements Info extends Data { public void load(){/*dosomething*/} }B
public class Employee extends Inf.implements Data{ public void load() {/*do something*/} }C
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public class Employee extends Info implements Data { public void load() { /*do something*/ } }B
public class Employee implements Info extends Data { public void load() { /*do something*/ } }C
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Abstract public void methoda();B
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单选题现有: 1. interface Animal { 2. void eat(); 3. } 4. 5. // insert code here 6. 7. public class HouseCat extends Feline { 8. public void eat() { } 9. } 和五个声明: abstract class Feline implements Animal { } abstract class Feline implements Animal { void eat(); } abstract class Feline implements Animal { public void eat(); } abstract class Feline implements Animal { public void eat() { } } abstract class Feline implements Animal { abstract public void eat(); } 分别插入到第5行,有几个可以通过编译?()A
0B
1C
2D
3
考题
多选题abstract class A { abstract void al(); void a2() { } } class B extends A { void a1() { } void a2() { } } class C extends B { void c1() { } } and: A x = new B(); C y = new C(); A z = new C(); Which four are valid examples of polymorphic method calls?()Ax.a2();Bz.a2();Cz.c1();Dz.a1();Ey.c1();Fx.a1();
考题
单选题Which will declare a method that is available to all members of the same package and be referenced without an instance of the class?()A
abstract public void methoda ();B
public abstract double inethoda ();C
static void methoda (double dl) {}D
public native double methoda () {}E
protected void methoda (double dl) {}
考题
单选题现有: interface Animal { void eat () ; } //insert code here public class HouseCat extends Feline { public void eat() { } } 和五个申明 abstract class Feline implements Animal { } abstract class Feline implements Animal { void eat () ; } abstract class Feline implements Animal { public void eat();} abstract class Feline implements Animal { public void eat() {} } abstract class Feline implements Animal { abstract public void eat();} 结果为:()A
1B
2C
3D
4
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