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

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、 23
  • B、 13
  • C、 123
  • D、 321

相关考题:

举例说明类和类之间的关系。

1. class Synapse {   2. protected int gap() { return 7; }   3. }   4.   5. class Creb extends Synapse { 6. // insert code here  7. }  分别插入到第 6 行,哪三行可以编译?()A、 int gap() { return 7; }B、 public int gap() { return 7; }C、 private int gap(int x) { return 7; }D、 protected Creb gap() { return this; }E、 public int gap() { return Integer.getInteger ("42"); }

StringBuffer对象中的值是不可变的

2. public class Foo implements Runnable (  3. public void run (Thread t) {  4. system.out.printIn(“Running.”);  5. }  6. public static void main (String[] args)  {  7. new thread (new Foo()).start(); 8. )  9. )   What is the result?()      A、 An exception is thrown.B、 The program exists without printing anything.C、 An error at line 1 causes compilation to fail.D、 An error at line 6 causes the compilation to fail.E、 “Running” is printed and the program exits.

现有如下五个声明:  Linel: int a_really_really_really_long_variable_name=5 ;     Line2: int  _hi=6;  Line3:  int  big=Integer. getlnteger("7”);      Line4:int $dollars=8;      line5: int %opercent=9;      哪行无法通过编译?()A、Line1B、Line3C、Line4D、Line5

Squeaky Beans Inc. hired an outside consultant to develop their web application. To finish the job quickly,the consultant created several dozen JSP pages that directly communicate with the database. The Squeakybusiness team has since purchased a set of business objects to model their system, and the Squeaky developer charged with maintaining the web application must now refactor all the JSPs to work with the newsystem. Which pattern can the developer use to solve this problem?()A、Transfer ObjectB、Service LocatorC、Intercepting FilterD、Business Delegate

以后哪项是合法的数组声明?()A、char[10]sB、char s[ ]C、char sD、char s [10]