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单选题
public static void main(String[] args) { try { args=null; args[0] = “test”; System.out.println(args[0]); } catch (Exception ex) { System.out.println(”Exception”); } catch (NullPointerException npe) { System.out.println(”NullPointerException”); } } What is the result?()
A
test
B
Exception
C
Compilation fails.
D
NullPointerException
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static void test() throws RuntimeException { try { System.out.print(”test “); throw new RuntimeException(); } catch (Exception ex) { System.out.print(”exception “); } } public static void main(String[] args) { try { test(); } catch (RuntimeException ex) { System.out.print(”runtime “); } System.out.print(”end “); } What is the result?() A、 test endB、 Compilation fails.C、 test runtime endD、 test exception endE、 A Throwable is thrown by main at runtime.
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public static void main(String[] args) { String str = “null‟; if (str == null) { System.out.println(”null”); } else (str.length() == 0) { System.out.println(”zero”); } else { System.out.println(”some”); } } What is the result?()A、 nullB、 zeroC、 someD、 Compilation fails.E、 An exception is thrown at runtime.
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public class Test { public static void main(String[] args) { String str = NULL; System.out.println(str); } } What is the result?() A、 NULLB、 Compilation fails.C、 The code runs with no output.D、 An exception is thrown at runtime.
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static void test() { try { String x=null; System.out.print(x.toString() +“ “); } finally { System.out.print(“finally “); } } public static void main(String[] args) { try { test(); } catch (Exception ex) { System.out.print(”exception “); } } What is the result?() A、 nullB、 finallyC、 null finallyD、 Compilation fails.E、 finally exception
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public class Test { public static void aMethod() throws Exception { try { throw new Exception(); } finally { System.out.println(“finally”); } } public static void main(String args[]) { try { aMethod(); } catch (Exception e) { System.out.println(“exception”); } System.out.println(“finished”); } } What is the result?() A、 finallyB、 exception finishedC、 finally exception finishedD、 Compilation fails.
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public class Test { public static void main( String[] args) { String foo = args[1]; String bar = args[2]; String baz = args[3]; System.out.println(“baz = “ + baz); } } And the command line invocation: java Test red green blue What is the result?() A、 baz =B、 baz = nullC、 baz = blueD、 Compilation fails.E、 An exception is thrown at runtime.
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public static void main(String[] args) { try { args=null; args[0] = “test”; System.out.println(args[0]); } catch (Exception ex) { System.out.println(”Exception”); } catch (NullPointerException npe) { System.out.println(”NullPointerException”); } } What is the result?() A、 testB、 ExceptionC、 Compilation fails.D、 NullPointerException
考题
Which code fragments will succeed in printing the last argument given on the command line to the standard output, and exit gracefully with no output if no arguments are given?() CODE FRAGMENT a: public static void main(String args[]) { if (args.length != 0) System.out.println(args[args.length-1]); } CODE FRAGMENT b: public static void main(String args[]) { try { System.out.println(args[args.length]); } catch (ArrayIndexOutOfBoundsException e) {} } CODE FRAGMENT c: public static void main(String args[]) { int ix = args.length; String last = args[ix]; if (ix != 0) System.out.println(last); } CODE FRAGMENT d: public static void main(String args[]) { int ix = args.length-1; if (ix 0) System.out.println(args[ix]); } CODE FRAGMENT e: public static void main(String args[]) { try { System.out.println(args[args.length-1]); }catch (NullPointerException e) {} } A、Code fragment a.B、Code fragment b.C、Code fragment c.D、Code fragment d.E、Code fragment e.
考题
public class Test { private static int[] x; public static void main(String[] args) { System.out.println(x[0]); } } What is the result?() A、 0B、 nullC、 Compilation fails.D、 A NullPointerException is thrown at runtime.E、 An ArrayIndexOutOfBoundsException is thrown at runtime.
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class Flow { public static void main(String [] args) { try { System.out.print("before "); doRiskyThing(); System.out.print("after "); } catch (Exception fe) { System.out.print("catch "); } System.out.println("done "); } public static void doRiskyThing() throws Exception { // this code returns unless it throws an Exception } } 可能会产生下面哪两项结果?() A、beforeB、before catchC、before after doneD、before catch done
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public class TestApp{ public static void main(String[] args){ try{ int i = 0; int j = 1 / i; String myname=null; if(myname.length()2) System.out.print(“1”); }catch(NullPointerException e){ System.out.print(“2”); } catch(Exception e){ System.out.print(“3”); } } } 上述程序运行后的输出是哪项?()A、 3B、 2C、 231D、 32
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public class Test { public static void main(String [] args) { System.out.println(args.length 4 args[4].equals(“-d”)); } } If the program is invoked using the command line: java Test One Two Three –d What is the result?() A、 trueB、 falseC、 Compilation fails.D、 An exception is thrown at runtime.
考题
1. class Exc0 extends Exception { } 2. class Exc1 extends Exc0 { } 3. public class Test { 4. public static void main(String args[]) { 5. try { 6. throw new Exc1(); 7. } catch (Exc0 e0) { 8. System.out.println(“Ex0 caught”); 9. } catch (Exception e) { 10. System.out.println(“exception caught”); 11. } 12. } 13. } What is the result?() A、 Ex0 caughtB、 exception caughtC、 Compilation fails because of an error at line 2.D、 Compilation fails because of an error at line 6.
考题
单选题static void test() { try { String x=null; System.out.print(x.toString() +“ “); } finally { System.out.print(“finally “); } } public static void main(String[] args) { try { test(); } catch (Exception ex) { System.out.print(”exception “); } } What is the result?()A
nullB
finallyC
null finallyD
Compilation fails.E
finally exception
考题
单选题public class Test { private static int[] x; public static void main(String[] args) { System.out.println(x[0]); } } What is the result?()A
0B
nullC
Compilation fails.D
A NullPointerException is thrown at runtime.E
An ArrayIndexOutOfBoundsException is thrown at runtime.
考题
单选题static void test() throws RuntimeException { try { System.out.print(”test “); throw new RuntimeException(); } catch (Exception ex) { System.out.print(”exception “); } } public static void main(String[] args) { try { test(); } catch (RuntimeException ex) { System.out.print(”runtime “); } System.out.print(”end “); } What is the result?()A
test endB
Compilation fails.C
test runtime endD
test exception endE
A Throwable is thrown by main at runtime.
考题
单选题public class Test { public static void main( String[] args) { String foo = args[1]; String bar = args[2]; String baz = args[3]; System.out.println(“baz = “ + baz); } } And the command line invocation: java Test red green blue What is the result?()A
baz =B
baz = nullC
baz = blueD
Compilation fails.E
An exception is thrown at runtime.
考题
单选题Which code fragments will succeed in printing the last argument given on the command line to the standard output, and exit gracefully with no output if no arguments are given?() CODE FRAGMENT a: public static void main(String args[]) { if (args.length != 0) System.out.println(args[args.length-1]); } CODE FRAGMENT b: public static void main(String args[]) { try { System.out.println(args[args.length]); } catch (ArrayIndexOutOfBoundsException e) {} } CODE FRAGMENT c: public static void main(String args[]) { int ix = args.length; String last = args[ix]; if (ix != 0) System.out.println(last); } CODE FRAGMENT d: public static void main(String args[]) { int ix = args.length-1; if (ix 0) System.out.println(args[ix]); } CODE FRAGMENT e: public static void main(String args[]) { try { System.out.println(args[args.length-1]); }catch (NullPointerException e) {} }A
Code fragment a.B
Code fragment b.C
Code fragment c.D
Code fragment d.E
Code fragment e.
考题
单选题static void test() throws Error { if (true) throw new AssertionError(); System.out.print(”test “); } public static void main(String[] args) { try { test(); } catch (Exception ex) { System.out.print(”exception “); } System.out.print(”elld “); } What is the result?()A
endB
Compilation fails.C
exception endD
exception test endE
A Throwable is thrown by main.F
An Exception is thrown by main.
考题
单选题public static void main(String[] args) { String str = “null‟; if (str == null) { System.out.println(”null”); } else (str.length() == 0) { System.out.println(”zero”); } else { System.out.println(”some”); } } What is the result?()A
nullB
zeroC
someD
Compilation fails.E
An exception is thrown at runtime.
考题
单选题public class Test { public static void aMethod() throws Exception { try { throw new Exception(); } finally { System.out.println(“finally”); } } public static void main(String args[]) { try { aMethod(); } catch (Exception e) { System.out.println(“exception”); } System.out.println(“finished”); } } What is the result?()A
finallyB
exception finishedC
finally exception finishedD
Compilation fails.
考题
单选题public class Test { public static void main(String[] args) { String str = NULL; System.out.println(str); } } What is the result?()A
NULLB
Compilation fails.C
The code runs with no output.D
An exception is thrown at runtime.
考题
单选题1. class Exc0 extends Exception { } 2. class Exc1 extends Exc0 { } 3. public class Test { 4. public static void main(String args[]) { 5. try { 6. throw new Exc1(); 7. } catch (Exc0 e0) { 8. System.out.println(“Ex0 caught”); 9. } catch (Exception e) { 10. System.out.println(“exception caught”); 11. } 12. } 13. } What is the result?()A
Ex0 caughtB
exception caughtC
Compilation fails because of an error at line 2.D
Compilation fails because of an error at line 6.
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