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多选题
interface A { public int getValue() } class B implements A { public int getValue() { return 1; } } class C extends B { // insert code here } Which three code fragments, inserted individually at line 15, make use of polymorphism?()
A
public void add(C c) { c.getValue(); }
B
public void add(B b) { b.getValue(); }
C
public void add(A a) { a.getValue(); }
D
public void add(A a, B b) { a.getValue(); }
E
public void add(C c1, C c2) { c1.getValue(); }
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更多 “多选题interface A { public int getValue() } class B implements A { public int getValue() { return 1; } } class C extends B { // insert code here } Which three code fragments, inserted individually at line 15, make use of polymorphism?()Apublic void add(C c) { c.getValue(); }Bpublic void add(B b) { b.getValue(); }Cpublic void add(A a) { a.getValue(); }Dpublic void add(A a, B b) { a.getValue(); }Epublic void add(C c1, C c2) { c1.getValue(); }” 相关考题
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考题
单选题interface Data { public void load(); } abstract class Info { public abstract void load(); } Which class correctly uses the Data interface and Info class?()A
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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考题
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s 14B
s 16C
s 10D
Compilation fails.E
An exception is thrown at runtime.
考题
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考题
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Which the two demonstrate an “is a” relationship?()Apublic interface Person {} Public class Employee extends Person {}Bpublic interface Shape {} public interface Rectangle extends Shape {}Cpublic interface Color {} public class Shape { private Color color; }Dpublic class Species {} public class Animal { private Species species; }Einterface Component {} Class Container implements Component {private Component [] children;
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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