Certified Java Programmer Mock Exam

Question 1

abstract class A {
  private int x = 4;
  private int 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?

Question 2

abstract class A {            // 1
  abstract final void m1();   // 2
  abstract final class B {}   // 3
  class C extends B {}        // 4
}

Compiler errors are generated at which of the following lines?

Question 3

Which of the following are class modifiers? Select all that are applicable to a top-level class and all that are applicable to a nested class. It is not required that a modifier be applicable to both.

Question 4

Which of the follow are true statements.

Question 5

Which of the following modifiers can be applied to a member class?

Question 6

Which of the follow are true statements.

Question 7

abstract class A {               // 1
  private abstract void m1();    // 2
  private abstract class B {}    // 3
  private class C extends B {}   // 4
}

Compiler errors are generated at which of the following lines?

Question 8

class A {
  A() {}        // 1
  int A;        // 2
  void A() {}   // 3
  class A {}    // 4
}

Compiler errors are generated at which of the following lines?

Question 9

If the strictfp modifier is applied to a class, then all float or double expressions in which of the following will also be implicitly strictfp?

Question 10

abstract class A {               // 1
  abstract strictfp void m1();   // 2
  abstract strictfp class B {}   // 3
  strictfp class C extends B {}  // 4
}

Compiler errors are generated at which of the following lines?

Question 11

class Z {
  abstract class A {}     // 1
  final class B {}        // 2
  private class C {}      // 3
  protected class D {}    // 4
  public class E {}       // 5
  static class F {}       // 6
  synchronized class G {} // 7
  transient class H {}    // 8
  volatile class I {}     // 9
  strictfp class J {}     // 10
}

Which of the class declarations results in a compiler error?

Question 12

class A {
  private static String s1 = "s1";
  final String s2 = "s2";
  A () { new Z("s5","s6");}
  class Z {
    final String s3 = "s3";
    String s4 = "s4";
    Z (final String s5, String s6) {
      System.out.print(???);
    }
  }
  public static void main(String args[]) {new A();}
}

Which variables can be substituted for ??? without causing a compiler error?

Question 13

class B {
  private static String s1 = "s1";
  final String s2 = "s2";
  B () { new Z("s5","s6");}
  static class Z {
    final String s3 = "s3";
    static String s4 = "s4";
    Z (final String s5, String s6) {
      System.out.print(???);
    }
  }
  public static void main(String args[]) {new B();}
}

Which variables can be substituted for ??? without causing a compiler error?

Question 14

1.  class Outer {
2.    static class StaticNested {
3.      static final int a = 25;
4.      static final int b;
5.      static int c;
6.      int d;
7.      static {b = 42;}
8.    }
9.    class NonStaticInner {
10.     static final int e = 25;
11.     static final int f;
12.     static int g;
13.     int h;
14.     static {f = 42;}
15.   }
16. }

What is the result of attempting to compile the program?

Question 15

1.  class Red {
2.    static class StaticNested {
3.      interface ABC {}
4.    }
5.    class NonStaticInner {
6.      interface DEF {}
7.    }
8.    interface GHI {}
9.  }

What is the result of attempting to compile the program?

Question 16

class G {
  final String s1 = "G.s1";
  class Z {
    String s1;
    void m1() {System.out.println(???);}
  }
  public static void main(String args[]) {
    G g = new G();
    g.new Z().m1();
  }
}

What field access expression could be used in place of ??? above to cause the program to print "G.s1"?