单选题1. public class Test {   2. public static void main (String args) {   3. unsigned byte b = 0;   4. b--;   5.   6. }   7. }   What is the value of b at line 5?()A  -1B  255C  127D  Compilation will fail.E  Compilation will succeed but the program will t

题目
单选题
1. public class Test {   2. public static void main (String args) {   3. unsigned byte b = 0;   4. b--;   5.   6. }   7. }   What is the value of b at line 5?()
A

 -1

B

 255

C

 127

D

 Compilation will fail.

E

 Compilation will succeed but the program will throw an exception at line 4.

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相似问题和答案

第1题:

1. public class A {  2. void A() {  3. System.out.println(“Class A”);  4. }  5. public static void main(String[] args) {  6. new A();  7. }  8. }  What is the result?()  

  • A、 Class A
  • B、 Compilation fails.
  • C、 An exception is thrown at line 2.
  • D、 An exception is thrown at line 6.
  • E、 The code executes with no output.

正确答案:E

第2题:

1. class A {  2. public byte getNumber ()  {  3.   return 1;  4.   }  5. }  6.    7. class B extends A {  8. public short getNumber()  {  9.  return 2;  10. }  11.    12. public static void main (String args[]) {   13.    B  b = new B ();  14.      System.out.printIn(b.getNumber())     15.   }  16. }    What is the result?()  

  • A、 Compilation succeeds and 1 is printed.
  • B、 Compilation succeeds and 2 is printed.
  • C、 An error at line 8 causes compilation to fail.
  • D、 An error at line 14 causes compilation to fail.
  • E、 Compilation succeeds but an exception is thrown at line 14.

正确答案:C

第3题:

1. class A {  2. public int getNumber(int a) {  3.     return a + 1;  4. }  5. }  6.    7. class B extends A {  8. public int getNumber (int a) {  9. return a + 2  10. }  11.    12. public static void main (String args[])  {  13. A a = new B();  14. System.out.printIn(a.getNumber(0));  15.    } 16. }     What is the result?()  

  • A、 Compilation succeeds and 1 is printed.
  • B、 Compilation succeeds and 2 is printed.
  • C、 An error at line 8 causes compilation to fail.
  • D、 An error at line 13 causes compilation to fail.
  • E、 An error at line 14 causes compilation to fail.

正确答案:B

第4题:

public class test(    public int aMethod()[   static int i=0;   i++;   return I;   )    public static void main (String args){   test test = new test();    test.aMethod();   int j = test.aMethod();   System.out.printIn(j);   ]  }   What is the result?()

  • A、 Compilation will fail.
  • B、 Compilation will succeed and the program will print “0”
  • C、 Compilation will succeed and the program will print “1”
  • D、 Compilation will succeed and the program will print “2”

正确答案:D

第5题:

1. class A {  2. public String toString ()  {  3. return “4”;  4. }  5. }  6. class B extends A {  7. public String toString ()   {  8. return super.toString()  + “3”;  9. }  10. }  11. public class Test {  12.   public static void main(String[]args)  {  13.      System.out.printIn(new B());  14.      }  15. }    What is the result?()  

  • A、 Compilation succeeds and 4 is printed.
  • B、 Compilation succeeds and 43 is printed.
  • C、 An error on line 9 causes compilation to fail.
  • D、 An error on line 14 causes compilation to fail.
  • E、 Compilation succeeds but an exception is thrown at line 9.

正确答案:B

第6题:

1. public class X {  2. public static void main (String[]args)   {  3. int [] a = new int [1]  4. modify(a);  5. System.out.printIn(a[0]);  6. }  7.    8. public static void modify (int[] a)  {  9.   a[0] ++;  10.    } 11. }       What is the result?()

  • A、 The program runs and prints “0”
  • B、 The program runs and prints “1”
  • C、 The program runs but aborts with an exception.
  • D、 An error “possible undefined variable” at line 4 causes compilation to fail.
  • E、 An error “possible undefined variable” at line 9 causes compilation to fail.

正确答案:B

第7题:

public class Test {   public static void main (String args) {   class Foo {   public int i = 3;  }   Object o = (Object) new Foo();   Foo foo = (Foo)o;   System.out.printIn(foo. i);  }   }   What is the result?()  

  • A、 Compilation will fail.
  • B、 Compilation will succeed and the program will print “3”
  • C、 Compilation will succeed but the program will throw a ClassCastException at line 6.
  • D、 Compilation will succeed but the program will throw a ClassCastException at line 7.

正确答案:B

第8题:

1. public class Test {   2. public static void main (String args) {   3. unsigned byte b = 0;   4. b--;   5.   6. }   7. }   What is the value of b at line 5?()  

  • A、 -1
  • B、 255
  • C、 127
  • D、 Compilation will fail.
  • E、 Compilation will succeed but the program will throw an exception at line 4.

正确答案:D

第9题:

1. interface foo {  2. int k = 0;  3. } 4.    5. public class test implements Foo (  6. public static void main(String args[]) (  7. int i;  8. Test test = new test ();  9. i= test.k;  10.i= Test.k;  11.i= Foo.k;  12.)  13.)  14.        What is the result?()  

  • A、 Compilation succeeds.
  • B、 An error at line 2 causes compilation to fail.
  • C、 An error at line 9 causes compilation to fail.
  • D、 An error at line 10 causes compilation to fail.
  • E、 An error at line 11 causes compilation to fail.

正确答案:A

第10题:

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.

正确答案:C

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