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单选题
1. public class Outer{  2. public void someOuterMethod() {  3. // Line 3  4. }  5. public class Inner{}  6. public static void main( String[]argv ) {  7. Outer o = new Outer();  8. // Line 8  9. }  10. }  Which instantiates an instance of Inner?()
A

 new Inner(); // At line 3

B

 new Inner(); // At line 8

C

 new o.Inner(); // At line 8

D

 new Outer.Inner(); // At line 8


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更多 “单选题1. public class Outer{  2. public void someOuterMethod() {  3. // Line 3  4. }  5. public class Inner{}  6. public static void main( String[]argv ) {  7. Outer o = new Outer();  8. // Line 8  9. }  10. }  Which instantiates an instance of Inner?()A  new Inner(); // At line 3B  new Inner(); // At line 8C  new o.Inner(); // At line 8D  new Outer.Inner(); // At line 8” 相关考题
考题 以下程序的调试结果为?public class Outer{public String name = "Outer";public static void main(String argv[]){Inner i = new Inner();i.showName();}private class Inner{String name =new String("Inner");void showName(){System.out.println(name);}}}A.输出结果 OuterB.输出结果 InnerC.编译错误,因Inner类定义为私有访问D.在创建Inner类实例的行出现编译错误

考题 1. public class Outer{  2. public void someOuterMethod() {  3. // Line 3  4. }  5. public class Inner{}  6. public static void main( String[]argv ) {  7. Outer o = new Outer();  8. // Line 8  9. }  10. }  Which instantiates an instance of Inner?()  A、 new Inner(); // At line 3B、 new Inner(); // At line 8C、 new o.Inner(); // At line 8D、 new Outer.Inner(); // At line 8

考题 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 1. public class a {  2. public void method1() {  3. try {  4. B b=new b();  5. b.method2();  6. // more code here  7. } catch (TestException te) {  8. throw new RuntimeException(te);  9. }  10. }  11. }  1. public class b {  2. public void method2() throws TestException {  3. // more code here  4. }  5. }  1. public class TestException extends Exception {  2. }  Given:  31. public void method() {  32. A a=new a();  33. a.method1();  34. }  Which is true if a TestException is thrown on line 3 of class b?()A、 Line 33 must be called within a try block.B、 The exception thrown by method1 in class a is not required to be caught.C、 The method declared on line 31 must be declared to throw a RuntimeException.D、 On line 5 of class a, the call to method2 of class b does not need to be placed in a try/catch block.

考题 package foo;  public class Outer {  public static class Inner {  }  }   Which statement is true?() A、 Compilation fails.B、 An instance of the Inner class can be constructed with “new Outer.Inner()”.C、 An instance of the Inner class cannot be constructed outside of package foo.D、 An instance of the Inner class can be constructed only from within the Outer class.E、 From within the package foo, and instance of the Inner class can be constructed with “new Inner()”.

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 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 Pizza {  2. java.util.ArrayList toppings;  3. public final void addTopping(String topping) {  4. toppings.add(topping); 5. }  6. }  7. public class PepperoniPizza extends Pizza {  8. public void addTopping(String topping) {  9. System.out.println(”Cannot add Toppings”);  10. }  11. public static void main(String[] args) {  12. Pizza pizza = new PepperoniPizza();  13. pizza.addTopping(”Mushrooms”);  14. }  15. }  What is the result?() A、 Compilation fails.B、 Cannot add ToppingsC、 The code runs with no output.D、 A NullPointerException is thrown in Line 4.

考题 package foo; public class Outer (  public static class Inner (  )  )   Which statement is true? () A、 An instance of the Inner class can be constructed with “new Outer.Inner ()”B、 An instance of the inner class cannot be constructed outside of package foo.C、 An instance of the inner class can only be constructed from within the outer class.D、 From within the package bar, an instance of the inner class can be constructed with “new inner()”

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. public class enclosingone (  2. public class insideone{}  3. )  4. public class inertest(  5. public static void main (string[]args)(  6. enclosingone eo= new enclosingone ();  7. //insert code here  8. )  9. )    Which statement at line 7 constructs an instance of the inner class?()  A、 InsideOnew ei= eo.new InsideOn();B、 Eo.InsideOne ei = eo.new InsideOne();C、 InsideOne ei = EnclosingOne.new InsideOne();D、 EnclosingOne.InsideOne ei = eo.new InsideOne();

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 10. class Inner {  11. private int x;  12. public void setX( int x) { this.x = x; }  13. public int getX() { return x; }  14. }  15.  16. class Outer {  17. private Inner y;  18. public void setY( Inner y) { this.y = y; }  19. public Inner getY() { return y; }  20. }  21.  22. public class Gamma {  23. public static void main( String[] args) { 24. Outer o = new Outer(); 25. Inner i = new Inner();  26.int n=10;  27. i.setX(n);  28. o.setY(i);  29. // insert code here  30. System.out.println( o.getY().getX());  31. }  32. }  Which three code fragments, added individually at line 29, produce the output 100?()A、 n = 100;B、 i.setX( 100);C、 o.getY().setX( 100);D、 i = new Inner(); i.setX( 100);E、 o.setY( i); i = new Inner(); i.setX( 100);F、 i = new Inner(); i.setX( 100); o.setY( i);

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 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. 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package foo;  public class Outer {  public static class Inner {  }  }   Which statement is true?()A  Compilation fails.B  An instance of the Inner class can be constructed with “new Outer.Inner()”.C  An instance of the Inner class cannot be constructed outside of package foo.D  An instance of the Inner class can be constructed only from within the Outer class.E  From within the package foo, and instance of the Inner class can be constructed with “new Inner()”.

考题 多选题10. class Inner {  11. private int x;  12. public void setX( int x) { this.x = x; }  13. public int getX() { return x; }  14. }  15.  16. class Outer {  17. private Inner y;  18. public void setY( Inner y) { this.y = y; }  19. public Inner getY() { return y; }  20. }  21.  22. public class Gamma {  23. public static void main( String[] args) { 24. Outer o = new Outer(); 25. Inner i = new Inner();  26.int n=10;  27. i.setX(n);  28. o.setY(i);  29. // insert code here  30. System.out.println( o.getY().getX());  31. }  32. }  Which three code fragments, added individually at line 29, produce the output 100?()An = 100;Bi.setX( 100);Co.getY().setX( 100);Di = new Inner(); i.setX( 100);Eo.setY( i); i = new Inner(); i.setX( 100);Fi = new Inner(); i.setX( 100); o.setY( i);

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 Pizza {  2. java.util.ArrayList toppings;  3. public final void addTopping(String topping) {  4. toppings.add(topping); 5. }  6. }  7. public class PepperoniPizza extends Pizza {  8. public void addTopping(String topping) {  9. System.out.println(”Cannot add Toppings”);  10. }  11. public static void main(String[] args) {  12. Pizza pizza = new PepperoniPizza();  13. pizza.addTopping(”Mushrooms”);  14. }  15. }  What is the result?()A  Compilation fails.B  Cannot add ToppingsC  The code runs with no output.D  A NullPointerException is thrown in Line 4.

考题 单选题package foo; public class Outer (  public static class Inner (  )  )   Which statement is true? ()A  An instance of the Inner class can be constructed with “new Outer.Inner ()”B  An instance of the inner class cannot be constructed outside of package foo.C  An instance of the inner class can only be constructed from within the outer class.D  From within the package bar, an instance of the inner class can be constructed with “new inner()”

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. public class enclosingone (  2. public class insideone{}  3. )  4. public class inertest(  5. public static void main (string[]args)(  6. enclosingone eo= new enclosingone ();  7. //insert code here  8. )  9. )    Which statement at line 7 constructs an instance of the inner class?()A  InsideOnew ei= eo.new InsideOn();B  Eo.InsideOne ei = eo.new InsideOne();C  InsideOne ei = EnclosingOne.new InsideOne();D  EnclosingOne.InsideOne ei = eo.new InsideOne();

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 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 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.