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Which of the following is a true statement?
| a. | An anonymous class can extend only the Object class. |
| b. | An anonymous class can not implement an interface. |
| c. | An anonymous class declaration can not have an implements clause. |
| d. | An anonymous class declaration can name more than one interface in the implements clause. |
| e. | The class instance creation expression for an anonymous class must never include arguments. |
| f. | None of the above |
Which of the following are true statements?
| a. | An anonymous class is implicitly abstract. |
| b. | An anonymous class is implicitly final. |
| c. | An anonymous class is implicitly static. |
| d. | A static reference variable can reference an instance of an anonymous class. |
| e. | An anonymous class declaration must have at least one explicit constructor declaration. |
| f. | An anonymous class declaration can have more than one explicit constructor declaration. |
abstract class A {
private int x = 4, y = 2;
public int x() {return x;}
public void x(int x) {this.x = x;}
public int y() {return y;}
public void y(int y) {this.y = y;}
public abstract int math();
}
class B {
static A a1 = new A(2,1) {
public A(int i1, int i2) {x(i1);y(i2);};
public int math() {return x()+y();}
};
public static void main(String[] args) {
System.out.print(a1.math());
}}
What is the result of attempting to compile and run the program?
| a. | Prints: 8 |
| b. | Prints: 3122 |
| c. | Compile-time error |
| d. | Run-time error |
| e. | None of the above |
class A {
private static int f1 = 1;
private int f2 = 2;
void m1(int p1, final int p2) {
int l1 = 5;
final int l2 = 6;
Object x = new Object() {
int a = f1; // 1
int b = f2; // 2
int c = p1; // 3
int d = p2; // 4
int e = l1; // 5
int f = l2; // 6
};}}
Compile-time errors are generated at which lines?
| a. | 1 |
| b. | 2 |
| c. | 3 |
| d. | 4 |
| e. | 5 |
| f. | 6 |
abstract class A {
private int x = 1, y = 1;
public A(int x, int y) {this.x = x; this.y = y;}
public abstract int math();
}
class B {
static A a1 = new A(2,1) {public int math() {return x + y;}};
static A a2 = new A(2,1) {public int math() {return x - y;}};
static A a3 = new A(2,1) {public int math() {return x * y;}};
static A a4 = new A(2,1) {public int math() {return x / y;}};
public static void main(String[] args) {
System.out.print("" + a1.math() + a2.math() +
a3.math() + a4.math());
}}
What is the result of attempting to compile and run the program?
| a. | Prints: 3122 |
| b. | Prints: 2011 |
| c. | Compile-time error |
| d. | Run-time error |
| e. | None of the above |
abstract class A {
private int x = 4, y = 2;
public int x() {return x;}
public void x(int x) {this.x = x;}
public int y() {return y;}
public void y(int y) {this.y = y;}
public abstract int math();
}
class B {
static A a1 = new A() {public int math() {return x()+y();}}
static A a2 = new A() {public int math() {return x()-y();}}
static A a3 = new A() {public int math() {return x()*y();}}
static A a4 = new A() {public int math() {return x()/y();}}
public static void main(String[] args) {
System.out.print("" + a1.math() + a2.math() +
a3.math() + a4.math());
}}
What is the result of attempting to compile and run the program?
| a. | Prints: 18 |
| b. | Prints: 6282 |
| c. | Compile-time error |
| d. | Run-time error |
| e. | None of the above |
class A {String m1() {return "A.m1";}}
interface B {String m2();}
class C {
static class D extends A implements B {
public String m1() {return "D.m1";}
public String m2() {return "D.m2";}
}
static A a1 = new A() implements B {
public String m1() {return "m1";}
public String m2() {return "m2";}
};
public static void main(String[] args) {
System.out.print(a1.m1() + "," + new C.D().m2());
}}
What is the result of attempting to compile and run the program?
| a. | Prints: m1,D.m2 |
| b. | Prints: A.m1,D.m2 |
| c. | Compile-time error |
| d. | Run-time error |
| e. | None of the above |
abstract class A {
private int x = 4, y = 2;
public A(int i1, int i2) {x=i1;y=i2;}
public int x() {return x;}
public void x(int x) {this.x = x;}
public int y() {return y;}
public void y(int y) {this.y = y;}
public abstract int math();
}
class B {
static A a1 = new A(2,1) {public int math() {return x()+y();}};
static A a2 = new A(2,1) {public int math() {return x()-y();}};
static A a3 = new A(2,1) {public int math() {return x()*y();}};
static A a4 = new A(2,1) {public int math() {return x()/y();}};
public static void main(String[] args) {
System.out.print("" + a1.math() + a2.math() +
a3.math() + a4.math());
}}
What is the result of attempting to compile and run the program?
| a. | Prints: 8 |
| b. | Prints: 3122 |
| c. | Compile-time error |
| d. | Run-time error |
| e. | None of the above |