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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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更多 “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 throw an exception at line 4.” 相关考题
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考题 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 throw an exception at line 4.

考题 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 AB、 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.

考题 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.

考题 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.

考题 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.

考题 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.

考题 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.

考题 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”

考题 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.

考题 1. class A {  3. public String to String() {  4. return “4”;  5. }  6. }  7. class B extends A {  8. public String toString() { 9. return super.toString() + “3”;  10. }  11. }  12. public class Test {  13. public static void main (String[] args) {  14. System.out.printIn(new B()); 15. }  16. }   What is the result( )?   A、 Compilation succeeds and 4 is printed.B、 Compilation …………… is printed.C、 An error on line 9 cause compilation to fail.D、 An error on line 14 cause compilation to fail.E、 Compilation succeeds but an exception is thrown at line 9.

考题 1. interface TestA { String toString(); }  2. public class Test {  3. public static void main(String[] args) {  4. System.out.println(new TestA() {  5. public String toString() { return “test”; }  6. }  7. }  8. }  What is the result?() A、 testB、 nullC、 An exception is thrown at runtime.D、 Compilation fails because of an error in line 1.E、 Compilation fails because of an error in line 4.F、 Compilation fails because of an error in line 5.

考题 1.public class Test {  2.public static void main (String args[]) {  3.class Foo {  4.public int i = 3;  5.}  6.Object o = (Object) new Foo();  7.Foo foo = (Foo)o;  8.System.out.printIn(foo. i); 9. }  10.}   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.

考题 class super (   public int I = 0;   public super (string text) (   I = 1   )   )     public class sub extends super (   public sub (string text) (   i= 2   )   public static void main (straing args) (  sub sub = new sub (“Hello”);   system.out. PrintIn(sub.i);  )   )   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”

考题 单选题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.

考题 单选题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.

考题 单选题1. public interface A {  2. public void doSomething(String thing);  3. }  1. public class AImpl implements A {  2. public void doSomething(String msg) { }  3. }  1. public class B {  2. public A doit() {  3. // more code here  4. }  5.  6. public String execute() { 7. // more code here  8. }  9. }  1. public class C extends B {  2. public AImpl doit() {  3. // more code here  4. }  5.  6. public Object execute() {  7. // more code here  8. }  9. }  Which statement is true about the classes and interfaces in the exhibit?()A  Compilation will succeed for all classes and interfaces.B  Compilation of class C will fail because of an error in line 2.C  Compilation of class C will fail because of an error in line 6.D  Compilation of class AImpl will fail because of an error in line 2.

考题 单选题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.

考题 单选题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.

考题 单选题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.

考题 单选题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”

考题 单选题1. interface TestA { String toString(); }  2. public class Test {  3. public static void main(String[] args) {  4. System.out.println(new TestA() {  5. public String toString() { return “test”; }  6. }  7. }  8. }  What is the result?()A  testB  nullC  An exception is thrown at runtime.D  Compilation fails because of an error in line 1.E  Compilation fails because of an error in line 4.F  Compilation fails because of an error in line 5.

考题 单选题1. class A {  3. public String to String() {  4. return “4”;  5. }  6. }  7. class B extends A {  8. public String toString() { 9. return super.toString() + “3”;  10. }  11. }  12. public class Test {  13. public static void main (String[] args) {  14. System.out.printIn(new B()); 15. }  16. }   What is the result( )?A  Compilation succeeds and 4 is printed.B  Compilation …………… is printed.C  An error on line 9 cause compilation to fail.D  An error on line 14 cause compilation to fail.E  Compilation succeeds but an exception is thrown at line 9.

考题 单选题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.

考题 单选题1.public class Test {  2.public static void main (String args[]) {  3.class Foo {  4.public int i = 3;  5.}  6.Object o = (Object) new Foo();  7.Foo foo = (Foo)o;  8.System.out.printIn(foo. i); 9. }  10.}   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.

考题 单选题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 AB  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.

考题 单选题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.