JAVA

1) What will this program print?

Computer comp[] = new Computer[3];

comp[0] = new Computer("Ace", "AMD", 8, 750, 3.5);

comp[1] = new Notebook("Dell", "Intel", 4, 500, 2.2, 15.5, 7.5);

comp[2] = comp[1];

for (int i = 0; i < comp.length; i++) {

System.out.println(comp[i].getRamSize() +" " +

comp[i].toString());

}

2) Explain the effect of each valid statement in the following fragment. Indicate any

invalid statements.

Computer c1 = new Computer();

Computer c2 = new Computer("Ace", "AMD", 8.0, 500, 3.0);

Computer c3 = new Notebook("Ace", "AMD", 4.0, 500, 3.0);

Notebook c4 = new Notebook("Bravo", "Intel", 4.0, 750, 3.0, 15.5, 5.5);

System.out.println(c2.manufacturer + "," + c4.processor);

System.out.println(c2.getDiskSize() + "," + c4.getRamSize());

System.out.println(c2.toString() + " " + c4.toString());

3) Correct each of the following statements that are incorrect, assuming that class PDGUI and class PDConsoleUI implement interface PDUserInterface.

a. PDGUI p1 = new PDConsoleUI();

b. PDGUI p2 = new PDUserInterface();

c. PDUserInterface p3 = new PDUserInterface();

d. PDUserInterface p4 = new PDConsoleUI();

e. PDGUI p5 = new PDUserInterface(); PDUserInterface p6 = p5;

f. PDUserInterface p7; p7 = new PDConsoleUI();