What is the output of this program? (or, can it be compiled)?

Ans: The output of the above program is shown below

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BasicJavaTask5 homework

Ans: The output of the above program is shown below:

What is the output? Explain it.

public class OOP {

public static void main(String[] args) {

OOP oop1 = new OOP();

OOP oop2 = new OOP();

System.out.print(oop1==oop2);

oop2 = oop1;

oop1 = new OOP();

System.out.print(oop1!=oop2); }}

Ans: The output of above code is given below:

Given these two Java files. What printed (or did any exceptions appear)? Explain it.

// D.java

public class D {

public void printMethod() {

System.out.println("Printed in Superclass.");

}

// C.java

public class C extends D {

public void printMethod() {

System.out.println("Printed in Subclass.");

super.printMethod();

}

public static void main(String[] args) {

C c = new C();

c.printMethod();

}

}
Ans: The output of the above program is shown below:

There is no any exception in the code. The child class inherits function of parent class.

Complete the following source code! Said that method Count() accepts three parameters: an integer (int n) and two matrices (int[][] x dan int[][] y) with size n x n. Count() method will return a new matrix by adding matrix x and matrix y without changing it.

public static int[][] Count(int n, int[][] x, int[][] y){

…

}

Ans: The output of the above code is given below:

Given a program: HotelGuestGUI, as below.

Before interaction	Registration with empty Name and NID
Registration with empty NID	Registration with empty Name
Registration done successfully. Pay attention to Status and Room Type, too.

Complete the following source code of HotelGuestGUI.java (see the blank spots and code sections).

public void start(Stage mainStage) throws Exception {
GridPane x = new GridPane();

x.setAlignment(Pos.CENTER);

x.setVgap(10);

x.setHgap(10);

Label y = new Label("Such a lovely place, such a lovely face");

HBox b = new HBox(y);

b.setAlignment(Pos.CENTER);

x.add(b, 0, 0, 2, 1);

Label z = new Label("Guest Name");

x.add(z, 0, 1);

TextField a = new TextField();

x.add(a, 1, 1);

Label c = new Label("Guest NID");

x.add(c, 0, 2);

TextField d = new TextField();

x.add(d, 1, 2);

Label j = new Label("Status");

x.add(j, 0, 3);

CheckBox e = new CheckBox("VIP?");

x.add(e, 1, 3);

Label k = new Label("Room Type");

x.add(k, 0, 4);

.................... i = new ....................();

i.getItems().add("Standard");

i.getItems().add("Executive");

i.getItems().add("Heaven");

i.setValue("Standard");

x.add(i, 1, 4);

Button f = new Button("Register");

x.add(f, 1, 5);

Text g = new Text("");

HBox h = new HBox(g);

h.setAlignment(Pos.CENTER);

x.add(h, 0, 6, 2, 1);

f. .................... (ev -> {

// complete the code fully here

});

Scene sc = new Scene(x, 280, 240);

mainStage.setScene(sc);

mainStage.setTitle("Hotel California");

mainStage.show();

}

What is the output?

int val;

String s = "DDP";

for(int i = 0; i < 3; i++) {

s = i % 3 == 1 ? s.toUpperCase() : s.toLowerCase();

}

s.toUpperCase();

switch(s) {

case "DDP":

val = 1; break;

case "ddP":

val = 2; break;

case "DDp":

val = 3;

default:

val = 4; break;

}

System.out.println(val);

Ans: The output of the above code is shown below:

Explain the following class diagram and source code example. What is the relationship between manager and employee?

Explain the differences of Java GUI: AWT, Java Swing, and JavaFX!

Ans:

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