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?()
第1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?()
第2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:()
第3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?()
第4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?()
第5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?()
第6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:()
第7题:
public class Threads4 { public static void main (String[] args) { new Threads4().go(); } public void go() { Runnable r = new Runnable() { public void run() { System.out.print(”foo”); } }; Thread t = new Thread(r); t.start(); t.start(); } } What is the result?()
第8题:
ABDCBDCB
ABCDABCD
Compilation fails.
An exception is thrown at runtime.
第9题:
Base
BaseBase
Compilation fails.
The code runs with no output.
An exception is thrown at runtime.
第10题:
AB
BC
ABC
BCD
Compilation fails.
第11题:
AC
BD
ACD
ABCD
Compilation fails.
第12题:
foofoofoofoofoo
foobarfoobarbar
foobarfoofoofoo
foobarfoobarfoo
barbarbarbarbar
foofoofoobarbar
foofoofoobarfoo
第13题:
public class X { public static void main(String [] args) { try { badMethod(); System.out.print(“A”); } catch (Exception ex) { System.out.print(“C”); } finally { System.out.print(“B”); } System.out.print(“D”); } public static void badMethod() { throw new Error(); } } What is the result?()
第14题:
class Foo { private int x; publicFoo(intx) {this.x=x; } public void setX( int x) { this.x = x; } public int getX() { return x; } } public class Gamma { static Foo fooBar( Foo foo) { foo = new Foo( 100); return foo; } public static void main( String[] args) { Foo foo = new Foo( 300); System.out.print( foo.getX() + “-“); Foo fooFoo = fooBar( foo); System.out.print( foo.getX() + “-“); System.out.print( fooFoo.getX() + “-“); foo = fooBar( fooFoo); System.out.print( foo.getX() + “-“); System.out.prmt( fooFoo.getX()); } } What is the output of this program?()
第15题:
public class Delta { static boolean foo(char c) { System.out.print(c); return true; } public static void main( String[] argv ) { int i =0; for ( foo(‘A’); foo(‘B’)&&(i<2); foo(‘C’)){ i++ ; foo(‘D’); } } } What is the result?()
第16题:
class Beverage { Beverage() { System.out.print("beverage "); } } class Beer extends Beverage { public static void main(String [] args) { Beer b = new Beer(14); } public int Beer(int x) { this(); System.out.print("beer1 "); } public Beer() { System.out.print("beer2 "); } } 结果是什么?()
第17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? ()
第18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?()
第19题:
BD
BCD
BDE
BCDE
ABCDE
Compilation fails.
第20题:
ABCD
Compilation fails.
C is printed before exiting with an error message.
BC is printed before exiting with an error message.
BCD is printed before exiting with an error message.
第21题:
Compilation fails.
An exception is thrown at runtime.
The code executes normally and prints „foo”.
The code executes normally, but nothing is printed.
第22题:
Shape
Circle
ShapeCircle
程序有错误
第23题:
55
56
65
66