Home » Java » Operators and Assignments
1.  

    
import java.awt.*;
class Ticker extends Component 
{
    public static void main (String [] args) 
    {
        Ticker t = new Ticker();
        /* Missing Statements ? */
    }
}
which two of the following statements, inserted independently, could legally be inserted into missing section of this code?
  1. boolean test = (Component instanceof t);
  2. boolean test = (t instanceof Ticker);
  3. boolean test = t.instanceof(Ticker);
  4. boolean test = (t instanceof Component);
A. 1 and 4
B. 2 and 3
C. 1 and 3
D. 2 and 4
2. 

Which of the following are legal lines of code?

  1. int w = (int)888.8;
  2. byte x = (byte)1000L;
  3. long y = (byte)100;
  4. byte z = (byte)100L;
A. 1 and 2
B. 2 and 3
C. 3 and 4
D. All statements are correct.
3. 

Which two statements are equivalent?

  1. 16*4
  2. 16>>2
  3. 16/2^2
  4. 16>>>2
A. 1 and 2
B. 2 and 4
C. 3 and 4
D. 1 and 3
4. 

Which two statements are equivalent?

  1. 3/2
  2. 3<2
  3. 3*4
  4. 3<<2
A. 1 and 2
B. 2 and 3
C. 3 and 4
D. 1 and 4
5.  

import java.awt.Button;
class CompareReference 
{
    public static void main(String [] args) 
    {
        float f = 42.0f;
        float [] f1 = new float[2];
        float [] f2 = new float[2];
        float [] f3 = f1;
        long x = 42;
        f1[0] = 42.0f;
    }
}
which three statements are true?
  1. f1 == f2
  2. f1 == f3
  3. f2 == f1[1]
  4. x == f1[0]
  5. f == f1[0]
A. 1, 2 and 3
B. 2, 4 and 5
C. 3, 4 and 5
D. 1, 4 and 5