单选题interface Beta {}  class Alpha implements Beta {  String testIt() {  return “Tested”;  }  }  public class Main1 {  static Beta getIt() {  return new Alpha();  }  public static void main( String[] args ) {  Beta b = getIt();  System.out.println( b.testIt() );  }  }  What is the result?()A TestedB Compilation fails.C The code runs with no output.D An exception is thrown at runtime.

单选题
interface Beta {}  class Alpha implements Beta {  String testIt() {  return “Tested”;  }  }  public class Main1 {  static Beta getIt() {  return new Alpha();  }  public static void main( String[] args ) {  Beta b = getIt();  System.out.println( b.testIt() );  }  }  What is the result?()
A

 Tested

B

 Compilation fails.

C

 The code runs with no output.

D

 An exception is thrown at runtime.


参考解析

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14 Alpha buys goods from Beta. At 30 June 2005 Beta’s account in Alpha’s records showed $5,700 owing to Beta.Beta submitted a statement to Alpha as at the same date showing a balance due of $5,200.Which of the following could account fully for the difference?A Alpha has sent a cheque to Beta for $500 which has not yet been received by Beta.B The credit side of Beta’s account in Alpha’s records has been undercast by $500.C An invoice for $250 from Beta has been treated in Alpha’s records as if it had been a credit note.D Beta has issued a credit note for $500 to Alpha which Alpha has not yet received.

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现有如下包结构:  com |-- x | |-- Alpha.class | | | |-- y | |-- Beta.class | |-- Gamma.class  和类:  class Test { Alpha a; Beta b; Gamma c; }  哪三个必须加入到类 Test 中,以使其通过编译?()A、package y;B、package com;C、import com.x.*;D、import com.x.y.*

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10. interface Foo {}  11. class Alpha implements Foo {}  12. class Beta extends Alpha {}  13. class Delta extends Beta {  14. public static void main( String[] args) {  15. Beta x = new Beta();  16. // insert code here  17. }  18. }  Which code, inserted at line 16, will cause a java.lang.ClassCastException?() A、 Alpha a = x;B、 Foo f= (Delta)x;C、 Foo f= (Alpha)x;D、 Beta b = (Beta)(Alpha)x;

interface Beta {}  class Alpha implements Beta {  String testIt() {  return “Tested”;  }  }  public class Main1 {  static Beta getIt() {  return new Alpha();  }  public static void main( String[] args ) {  Beta b = getIt();  System.out.println( b.testIt() );  }  }  What is the result?()  A、 TestedB、 Compilation fails.C、 The code runs with no output.D、 An exception is thrown at runtime.

定义alpha测试和beta测试的区别。

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问答题Alpha测试与beta的区别?

单选题10. interface Foo {}  11. class Alpha implements Foo {}  12. class Beta extends Alpha {}  13. class Delta extends Beta {  14. public static void main( String[] args) {  15. Beta x = new Beta();  16. // insert code here  17. }  18. }  Which code, inserted at line 16, will cause a java.lang.ClassCastException?()A Alpha a = x;B Foo f= (Delta)x;C Foo f= (Alpha)x;D Beta b = (Beta)(Alpha)x;

单选题interface Beta {}  class Alpha implements Beta {  String testIt() {  return “Tested”;  }  }  public class Main1 {  static Beta getIt() {  return new Alpha();  }  public static void main( String[] args ) {  Beta b = getIt();  System.out.println( b.testIt() );  }  }  What is the result?()A TestedB Compilation fails.C The code runs with no output.D An exception is thrown at runtime.

多选题10. class Foo {  11. static void alpha() { /* more code here */ }  12. void beta() { /* more code here */ }  13. }  Which two are true?()AFoo.beta() is a valid invocation of beta().BFoo.alpha() is a valid invocation of alpha().CMethod beta() can directly call method alpha().DMethod alpha() can directly call method beta().

单选题现有:   1.  class Alpha { void m1() {} }   2.  class Beta extends Alpha { void m2() { } }   3.  class Gamma extends Beta { }   4.   5.  class GreekTest {   6.    public static void main(String [] args) {   7.      Alpha [] a = {new Alpha(), new Beta(), new Gamma() };   8.      for(Alpha a2 : a) {   9.        a2.m1();    10.       if (a2 instanceof Beta || a2 instanceof Gamma)    11.         //insert code here   12.     }    13.   }   14. }    哪一行代码插入到第11行,将编译但是会在运行时产生异常?()A a2.m2();B ((Beta)a2).m2();C ((Alpha)a2).m2();D ((Gamma)a2).m2();

单选题1. class Alpha { void m1() {} }   2. class Beta extends Alpha { void m2() { } }   3. class Gamma extends Beta { }   4.   5. class GreekTest {   6. public static void main(String [] args) {   7. a Alpha [] a = {new Alpha(), new Beta(), new Gamma() };   8. for(Alpha a2 : a) {   9. a2.m1();   10. if (a2 instanceof Beta || a2 instanceof Gamma)   11. //insert code here   12. }   13. }   14. }   哪一行代码插入到第11行,将编译但是会在运行时产生异常?()A a2.m2();B ((Beta)a2).m2();C ((Alpha)a2).m2();D ((Gamma)a2).m2();

单选题interface Animal {  void soundOff();  }  class Elephant implements Animal {  public void soundOff() {  System.out.println(“Trumpet”);  }  }  class Lion implements Animal {  public void soundOff() { System.out.println(“Roar”);  }  }  class Alpha1 {  static Animal get( String choice ) {  if ( choice.equalsIgnoreCase( “meat eater” )) {  return new Lion();  } else {  return new Elephant();  }  }  }  Which compiles?()A new Animal().soundOff();B Elephant e = new Alpha1();C Lion 1 = Alpha.get(“meat eater”);D new Alpha1().get(“veggie”).soundOff();

单选题Which code, inserted at line 16, will cause a java.lang.ClassCastException?()A Alpha a=x;B Foo f=(Delta)x;C Foo f=(Alpha)x;D Beta b=(Beta)(Alpha)x;

单选题Given: Which code, inserted at line 16, will cause a java.lang.ClassCastException?()A Alpha a = x;B Foo f = (Delta)x;C Foo f = (Alpha)x;D Beta b = (Beta)(Alpha)x;