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class Bird {  static void talk() { System.out.print("chirp "); }  }  class Parrot extends Bird {  static void talk() { System.out.print("hello "); }  public static void main(String [] args) {  Bird [] birds = {new Bird(), new Parrot()};  for( Bird b : birds)  b.talk();  }  }  结果为:() 

  • A、chirp chirp
  • B、chirp hello
  • C、hello hello
  • D、编译失败

参考答案

更多 “ class Bird {  static void talk() { System.out.print("chirp "); }  }  class Parrot extends Bird {  static void talk() { System.out.print("hello "); }  public static void main(String [] args) {  Bird [] birds = {new Bird(), new Parrot()};  for( Bird b : birds)  b.talk();  }  }  结果为:() A、chirp chirpB、chirp helloC、hello helloD、编译失败” 相关考题
考题 classBird{staticvoidtalk(){System.out.print(chirp);}}classParrotextendsBird{staticvoidtalk(){System.out.print(hello);}publicstaticvoidmain(String[]args){Bird[]birds={newBird(),newParrot()};for(Birdb:birds)b.talk();}}结果为:()A.chirpchirpB.chirphelloC.hellohelloD.编译失败

考题 现有:classBird{voidtalk(){System.out.print(chirp);}}classParrot2extendsBird{protectedvoidtalk(){System.out.print(hello);publicstaticvoidmain(String[]args){Bird[]birds={newBird(),newParrot2()};for(Birdb:birds)b.talk();}}结果是什么?()A.chirpchirpB.hellohelloC.chirphelloD.编译错误

考题 interface A{int x = 0;}class B{int x =1;}class C extends B implements A {public void pX(){System.out.println(x);}public static void main(String[] args) {new C().pX();}}

考题 以下程序调试结果为:class Base{Base(){int i = 100;System.out.print (i);}}public class Pri extends Base{static int i = 200;public static void main(String argv[]){Pri p = new Pri();System.out.print(i);}} A.编译错误B.200C.100200D.100

考题 class One {  public One() { System.out.print(1); }  }  class Two extends One {  public Two() { System.out.print(2); }  }  class Three extends Two {  public Three() { System.out.print(3); }  }  public class Numbers{  public static void main( String[] argv) { new Three(); }  }  What is the result when this code is executed?() A、 1B、 3C、 123D、 321E、 The code rims with no output.

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考题 Which declarations will allow a class to be started as a standalone program?()  A、public void main(String args[])B、public void static main(String args[])C、public static main(String[] argv)D、final public static void main(String [] array)E、public static void main(String args[])

考题 class BitStuff {   BitStuff go() { System.out.print("bits "); return this; }   }   class MoreBits extends BitStuff {   MoreBits go() { System.out.print("more "); return this; }   public static void main(String [] args) {   BitStuff [] bs = {new BitStuff(), new MoreBits()};   for( BitStuff b : bs)   b.go();   }   }   结果为:()  A、bits bitsB、bits moreC、more moreD、编译失败

考题 public class Base {  public static final String FOO = “foo”;  public static void main(String[] args) {  Base b = new Base();  Sub s = new Sub();  System.out.print(Base.FOO);  System.out.print(Sub.FOO);  System.out.print(b.FOO);  System.out.print(s.FOO);  System.out.print(((Base)s).FOO);  } }  class Sub extends Base {public static final String FOO=bar;}  What is the result?() A、 foofoofoofoofooB、 foobarfoobarbarC、 foobarfoofoofooD、 foobarfoobarfooE、 barbarbarbarbarF、 foofoofoobarbarG、 foofoofoobarfoo

考题 class Flibitz {   public static void main(String [] args) {   int grop = 7;   new Flibitz().go(grop);   System.out.print(grop);   }   void go(int grop) {   if(++grop 〉 7) grop++;   System.out.print(grop);   }   }   结果为:()  A、77B、79C、97D、99

考题 现有:  class Bird {  void talk() { System.out.print("chirp "); }         }  class Parrot2 extends Bird {  protected void talk() { System.out.print("hello ");        public static void main(String [] args) {  Bird [] birds = {new Bird(), new Parrot2 () };         for( Bird b : birds)          b.talk () ;         }         }  结果是什么 ?()      A、 chirp chirpB、 hello helloC、 chirp helloD、编译错误

考题 public class X {  public static void main(String [] args) {  try {  badMethod();  System.out.print(“A”); }  catch (Exception ex) {  System.out.print(“B”);  }  finally {  System.out.print(“C”);  }  System.out.print(“D”);  }   public static void badMethod() {} }  What is the result?()  A、 ACB、 BDC、 ACDD、 ABCDE、 Compilation fails.

考题 class Passer {  static final int x = 5;  public static void main(String [] args) { new Passer().go(x);  System.out.print(x);  }  void go(int x) {  System.out.print(++x);  }  }  结果是什么?() A、55B、56C、65D、66

考题 public class X {  public static void main(String [] args) {  try {  badMethod();  System.out.print(“A”);  }  catch (RuntimeException ex) {  System.out.print(“B”);  }  catch (Exception ex1) {  System.out.print(“C”);  }   finally {  System.out.print(“D”);  }  System.out.print(“E”);  }  public static void badMethod() {  throw new RuntimeException();  }  }  What is the result?()  A、 BDB、 BCDC、 BDED、 BCDEE、 ABCDEF、 Compilation fails.

考题 public class X {  public static void main(String [] args) {  try {  badMethod();  System.out.print(“A”);  }  catch (Exception ex) {  System.out.print(“B”);  }  finally {  System.out.print(“C”);  }  System.out.print(“D”);  }  public static void badMethod() {  throw new RuntimeException();  }  }  What is the result? () A、 ABB、 BCC、 ABCD、 BCDE、 Compilation fails.

考题 class Birds {  public static void main(String [] args) {  try {  throw new Exception();  } catch (Exception e) { try {  throw new Exception();  } catch (Exception e2) { System.out.print("inner "); }  System.out.print("middle "); }  System.out.print("outer ");  }  }  结果为:()  A、innerB、inner outerC、middle outerD、inner middle outer

考题 class Base {  Base() { System.out.print(“Base”); }  }  public class Alpha extends Base {  public static void main( String[] args ) {  new Alpha();  new Base();  }  }  What is the result?()  A、 BaseB、 BaseBaseC、 Compilation fails.D、 The code runs with no output.E、 An exception is thrown at runtime.

考题 单选题public class X {  public static void main(String [] args) {  try {  badMethod();  System.out.print(“A”);  }  catch (RuntimeException ex) {  System.out.print(“B”);  }  catch (Exception ex1) {  System.out.print(“C”);  }   finally {  System.out.print(“D”);  }  System.out.print(“E”);  }  public static void badMethod() {  throw new RuntimeException();  }  }  What is the result?()A  BDB  BCDC  BDED  BCDEE  ABCDEF  Compilation fails.

考题 多选题Which declarations will allow a class to be started as a standalone program?()Apublic void main(String args[])Bpublic void static main(String args[])Cpublic static main(String[] argv)Dfinal public static void main(String [] array)Epublic static void main(String args[])

考题 单选题class Base {  Base() { System.out.print(“Base”); }  }  public class Alpha extends Base {  public static void main( String[] args ) {  new Alpha();  new Base();  }  }  What is the result?()A  BaseB  BaseBaseC  Compilation fails.D  The code runs with no output.E  An exception is thrown at runtime.

考题 单选题class Bird {  static void talk() { System.out.print("chirp "); }  }  class Parrot extends Bird {  static void talk() { System.out.print("hello "); }  public static void main(String [] args) {  Bird [] birds = {new Bird(), new Parrot()};  for( Bird b : birds)  b.talk();  }  }  结果为:()A chirp chirpB chirp helloC hello helloD 编译失败

考题 单选题public class X {  public static void main(String [] args) {  try {  badMethod();  System.out.print(“A”);  }  catch (Exception ex) {  System.out.print(“B”);  }  finally {  System.out.print(“C”);  }  System.out.print(“D”);  }  public static void badMethod() {  throw new RuntimeException();  }  }  What is the result? ()A  ABB  BCC  ABCD  BCDE  Compilation fails.

考题 单选题现有:  class Bird {  void talk() { System.out.print("chirp "); }         }  class Parrot2 extends Bird {  protected void talk() { System.out.print("hello ");        public static void main(String [] args) {  Bird [] birds = {new Bird(), new Parrot2 () };         for( Bird b : birds)          b.talk () ;         }         }  结果是什么 ?()A  chirp chirpB  hello helloC  chirp helloD 编译错误

考题 单选题下列程序的运行结果是(  )。class Shape{ public Shape(){ System.out.print("Shape"); }}class Circle extends Shape{ public Circle(){ System.out.print("Circle"); }}public class Test{ public static void main(String[]args){ Shape d=new Circle(); }}A ShapeB CircleC ShapeCircleD 程序有错误

考题 单选题public class X {  public static void main(String [] args) {  try {  badMethod();  System.out.print(“A”); }  catch (Exception ex) {  System.out.print(“B”);  }  finally {  System.out.print(“C”);  }  System.out.print(“D”);  }   public static void badMethod() {} }  What is the result?()A  ACB  BDC  ACDD  ABCDE  Compilation fails.

考题 单选题class Passer {  static final int x = 5;  public static void main(String [] args) { new Passer().go(x);  System.out.print(x);  }  void go(int x) {  System.out.print(++x);  }  }  结果是什么?()A 55B 56C 65D 66

考题 单选题public class Base {  public static final String FOO = “foo”;  public static void main(String[] args) {  Base b = new Base();  Sub s = new Sub();  System.out.print(Base.FOO);  System.out.print(Sub.FOO);  System.out.print(b.FOO);  System.out.print(s.FOO);  System.out.print(((Base)s).FOO);  } }  class Sub extends Base {public static final String FOO=bar;}  What is the result?()A  foofoofoofoofooB  foobarfoobarbarC  foobarfoofoofooD  foobarfoobarfooE  barbarbarbarbarF  foofoofoobarbarG  foofoofoobarfoo