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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.


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更多 “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.” 相关考题
考题 class A{public int getNumber(int a){return a+1;}}class B extends A{public int getNumber(int a, char c){return a+2;}public static void main(String[] args){B b=new B();System.out.println(b.getNumber(0));}}what is the result?()A.compilation succeeds and 1 is printedB.compilation succeeds and 2 is printedC.compilation succeeds and 3 is printedD.An error at this program cause compilation to fail

考题 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 1. public class SimpleCalc {  2. public int value;  3. public void calculate() { value += 7; }  4. } And:  1. public class MultiCalc extends SimpleCalc {  2. public void calculate() { value -= 3; }  3. public void calculate(int multiplier) {  4. calculate();  5. super.calculate();  6. value *=multiplier;  7. }  8. public static void main(String[] args) {  9. MultiCalc calculator = new MultiCalc();  10. calculator.calculate(2);  11. System.out.println(”Value is: “+ calculator.value);  12. }  13. }  What is the result?() A、 Value is: 8B、 Compilation fails.C、 Value is: 12D、 Value is: -12E、 The code runs with no output.F、 An exception is thrown at runtime.

考题 1. public class Target {  2. private int i = 0;  3. public int addOne() {  4. return ++i;  5. }  6. }  And:  1. public class Client {  2. public static void main(String[] args) {  3. System.out.println(new Target().addOne());  4. }  5. }  Which change can you make to Target without affecting Client?() A、 Line 4 of class Target can be changed to return i++;B、 Line 2 of class Target can be changed to private int i = 1;C、 Line 3 of class Target can be changed to private int addOne() {D、 Line 2 of class Target can be changed to private Integer i = 0;

考题 1. public class A {  2. public void doit() {  3. }  4. public String doit() {  5. return “a”;  6. }  7. public double doit(int x) {  8. return 1.0;  9. }  10.}  What is the result?() A、 An exception is thrown at runtime.B、 Compilation fails because of an error in line 7.C、 Compilation fails because of an error in line 4.D、 Compilation succeeds and no runtime errors with class A occur.

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. public class SwitchTest {  2. public static void main (String []args)  {  3. System.out.PrintIn(“value =” +switchIt(4));  4. }  5. public static int switchIt(int x)  {  6. int j = 1;  7. switch (x) {  8. case 1: j++;  9. case 2: j++;  10. case 3: j++;  11. case 4: j++;  12. case 5: j++;  13. default:j++;  14. }  15. return j + x;  16. }  17. }     What is the output from line 3?()  A、 Value = 3B、 Value = 4C、 Value = 5D、 Value = 6E、 Value = 7F、 Value = 8

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 10. interface Foo { int bar(); }  11. public class Sprite {  12. public int fubar( Foo foo) { return foo.bar(); }  13. public void testFoo() {  14. fubar(  15. // insert code here  16.);  17. }  18. }  Which code, inserted at line 15, allows the class Sprite to compile?() A、 Foo { public int bar() { return 1; } }B、 new Foo { public int bar() { return 1; } }C、 newFoo() { public int bar(){return 1; } }D、 new class Foo { public int bar() { return 1; } }

考题 1. public class Test { 2. public static String output =””; 3.  4. public static void foo(int i) { 5. try { 6. if(i==1) { 7. throw new Exception(); 8. } 9. output += “1”; 10. } 11. catch(Exception e) { 12. output += “2”; 13. return; 14. } 15. finally { 16. output += “3”;17. } 18. output += “4”; 19. } 20.  21. public static void main(String args[]) { 22. foo(0); 23. foo(1); 24.  25. }26. } What is the value of the variable output at line 23?()

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 class A {  public byte getNumber() {  return 1;  }  }  class B extends A {  public short getNumber() {  return 2;  }  public static void main(String args[]) {  B b = new B();  System.out.println(b.getNumber()); }  }   What is the result?()A、 1B、 2C、 An exception is thrown at runtime.D、 Compilation fails because of an error in line 8.E、 Compilation fails because of an error in line 14.

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. class A {  2. public byte file Number ( ) { 3. return l;  4. }  5. }  6.  7. Class B extends A {  8. public short getNumber( ) {  9.  return 2;  10. }  11.  12. public short getNumber( ) {  13. B b = new B( );  14. System.out.printIn(b.getNumber( ));  15. }  16. }   What is the result()?  A、 Compilation succeeds and l is printed.B、 Compilation succeeds and 2 printed.C、 An error at line 8 cause compilation to fail.D、 An error at line 14 cause complication to fail.E、 Complication succeeds but an exception is thrown at line 14.

考题 1. public class test (  2. public static void main(string args[]) {  3. int 1= 0;  4. while (i)  {  5. if (i==4) {  6. break;  7. }  8. ++i;  9. }  10.    11. }  12. )   What is the value of i at line 10?()A、 0B、 3C、 4D、 5E、 The code will not compile.

考题 class A {   public int getNumber(int a) {   return a + 1;   }   }    class B extends A {   public int getNumber (int a) {   return a + 2   }    public static void main (String args) {   A a = new B();   System.out.printIn(a.getNumber(0));   }   }   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 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 class test (  2. public static void main(string args[]) {  3. int 1= 0;  4. while (i)  {  5. if (i==4) {  6. break;  7. }  8. ++i;  9. }  10.    11. }  12. )   What is the value of i at line 10?()A  0B  3C  4D  5E  The code will not compile.

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. public class SimpleCalc {  2. public int value;  3. public void calculate() { value += 7; }  4. } And:  1. public class MultiCalc extends SimpleCalc {  2. public void calculate() { value -= 3; }  3. public void calculate(int multiplier) {  4. calculate();  5. super.calculate();  6. value *=multiplier;  7. }  8. public static void main(String[] args) {  9. MultiCalc calculator = new MultiCalc();  10. calculator.calculate(2);  11. System.out.println(”Value is: “+ calculator.value);  12. }  13. }  What is the result?()A  Value is: 8B  Compilation fails.C  Value is: 12D  Value is: -12E  The code runs with no output.F  An exception is thrown at runtime.

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class A {   public int getNumber(int a) {   return a + 1;   }   }    class B extends A {   public int getNumber (int a) {   return a + 2   }    public static void main (String args) {   A a = new B();   System.out.printIn(a.getNumber(0));   }   }   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. class A {  2. public byte file Number ( ) { 3. return l;  4. }  5. }  6.  7. Class B extends A {  8. public short getNumber( ) {  9.  return 2;  10. }  11.  12. public short getNumber( ) {  13. B b = new B( );  14. System.out.printIn(b.getNumber( ));  15. }  16. }   What is the result()?A  Compilation succeeds and l is printed.B  Compilation succeeds and 2 printed.C  An error at line 8 cause compilation to fail.D  An error at line 14 cause complication to fail.E  Complication succeeds but an exception is thrown at line 14.

考题 单选题1. public class SwitchTest {  2. public static void main (String []args)  {  3. System.out.PrintIn(“value =” +switchIt(4));  4. }  5. public static int switchIt(int x)  {  6. int j = 1;  7. switch (x) {  8. case 1: j++;  9. case 2: j++;  10. case 3: j++;  11. case 4: j++;  12. case 5: j++;  13. default:j++;  14. }  15. return j + x;  16. }  17. }     What is the output from line 3?()A  Value = 3B  Value = 4C  Value = 5D  Value = 6E  Value = 7F  Value = 8

考题 单选题10. interface Foo { int bar(); }  11. public class Sprite {  12. public int fubar( Foo foo) { return foo.bar(); }  13. public void testFoo() {  14. fubar(  15. // insert code here  16.);  17. }  18. }  Which code, inserted at line 15, allows the class Sprite to compile?()A  Foo { public int bar() { return 1; } }B  new Foo { public int bar() { return 1; } }C  newFoo() { public int bar(){return 1; } }D  new class Foo { public int bar() { return 1; } }

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. public class Target {  2. private int i = 0;  3. public int addOne() {  4. return ++i;  5. }  6. }  And:  1. public class Client {  2. public static void main(String[] args) {  3. System.out.println(new Target().addOne());  4. }  5. }  Which change can you make to Target without affecting Client?()A  Line 4 of class Target can be changed to return i++;B  Line 2 of class Target can be changed to private int i = 1;C  Line 3 of class Target can be changed to private int addOne() {D  Line 2 of class Target can be changed to private Integer i = 0;