Programming in Java | Week 8
Session: JAN-APR 2023
Course Name: Programming in Java
Course Link: Click Here
These are NPTEL Programming In Java Week 8 Assignment 8 Answers
Q1. Which of the following is NOT a class of java.awt package?
a. Color
b. Composite
c. Container
d. Cursor
Answer: b. Composite
Q2. Which of the following is/are NOT an exception of java.awt package?
a. HeadlessException
b. AWTException
c. FontFormatException
d. IllegalStateException
Answer: d. IllegalStateException
These are NPTEL Programming In Java Week 8 Assignment 8 Answers
Q3. Which of the following method is/are of class button in java.awt package?
a. getLabel()
b. setLabel(String label)
c. getCurrent()
d. getltem(int index)
Answer: a, b
Q4. Which of the following is TRUE about the following GUI?
a. There is a Frame and two TextFields.
b. There is a Frame with two Labels and two non-editable TextFields.
c. There are two Labels.
d. There is a Frame with two Labels and two TextFields.
Answer: d. There is a Frame with two Labels and two TextFields.
These are NPTEL Programming In Java Week 8 Assignment 8 Answers
Q5. Which of the following is TRUE regarding check box and radio button?
a. Check box is used for single selection item whereas radio button is used for multiple selection.
b. Check box is used for multiple selection items whereas radio button is used for single selection.
c. Both are used for multiple as well as single item selection.
d. Checkbox is always preferred than radio buttons.
Answer: b. Check box is used for multiple selection items whereas radio button is used for single selection.
Q6. Which of the following is TRUE about check box in Java?
a. A check box can be in either an “on” (true) or “off” (false) state.
b. Clicking on a check box changes its state from “on” to “off.” or from “off” to “on.”
c. A check box can be in an “on” (true) and in “off” (false) state simultaneously.
d. Check boxes cannot be grouped together.
Answer: a, b
These are NPTEL Programming In Java Week 8 Assignment 8 Answers
Q7. Which of the following method is used to remove all items from scrolling list in java.awt.list?
a. hide()
b. remove()
c. clear()
d. close()
Answer: c. clear()
Q8. Which of the following statement is FALSE about the update() in java.awt package?
a. Sets the color of the graphics context to be the foreground color of this component.
b. Calls this component’s paint method to completely redraw this component.
c. Updates the component by checking an online repository.
d. Clears this component by filling it with the background color.
Answer: a. Sets the color of the graphics context to be the foreground color of this component.
These are NPTEL Programming In Java Week 8 Assignment 8 Answers
Q9. Which of the following is the latest graphics and media package for Java?
a. Applet
b. AWT
c. Swing
d. JavaFX
Answer: d. JavaFX
Q10. If setText(String text) is a method of Label class, then why it is called non editable?
a. Because user-input is unavailable during runtime.
b. A Label is just a TextField with non-editable property turned on.
c. Labels are editable by default.
d. setText(String text) is not a method of Label class.
Answer: a. Because user-input is unavailable during runtime.
Programming Assignment of Programming in Java
Question 1
Write a program which will print a pyramid of “*” ‘s of height “n” and print the number of “*” ‘s in the pyramid.
For example:
Input : 5
Output:
*
* * *
* * * * *
* * * * * * *
* * * * * * * * *
25
Solution:
import java.util.*;
public class Pattern1 {
public static void main(String[] args) {
Scanner inr = new Scanner(System.in);
int n = inr.nextInt();
int k = 0,sum=0;
for(int i = 1; i <= n; ++i, k = 0) {
for(int space = 1; space <= n - i; ++space) {
System.out.print(" ");
}
while(k != 2 * i - 1) {
System.out.print("* ");
sum=sum+1;
++k;
}
System.out.println();
}
System.out.println(sum);
}
}Question 2
Write a program which will print a pascal pyramid of “*” ‘s of height “l” .
For example:
input: 8
output :
*
* *
* * *
* * * *
* * * * *
* * * * * *
* * * * * * *
* * * * * * * *
Solution:
import java.util.*;
public class Pattern2 {
public static void main(String[] args) {
Scanner inr = new Scanner(System.in);
int l = inr.nextInt();
int i,j;
int space=l-1;
for(i=0;i< l;i++)
{
for(j=0;j< space;j++)
{
System.out.print(" ");
}
for(j=0;j<=i;j++)
{
System.out.print("* ");
}
System.out.print("\n");
space--;
}
}
}These are NPTEL Programming In Java Week 8 Assignment 8 Answers
Question 3
Write a program which will print a pyramid of “numbers” ‘s of height “n” and print the sum of all number’s in the pyramid.
For example:
input: 5
output:
1
1 2 3
1 2 3 4 5
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8 9
95
Solution:
import java.util.*;
public class Pattern3 {
public static void main(String[] args) {
Scanner inr = new Scanner(System.in);
int n = inr.nextInt();
int k = 1,sum=0;
for(int i = 1; i <= n; ++i, k = 1) {
for(int space = 1; space <= n-i; ++space) {
System.out.print(" ");
}
while(k <= 2 * i - 1) {
System.out.print(k+" ");
sum=sum+k;
++k;
}
System.out.println();
}
System.out.println(sum);
}
}Question 4
Write a program to print symmetric Pascal’s triangle of “*” ‘s of height “l” of odd length . If input “l” is even then your program will print “Invalid line number”.
For example:
input : 5
output:
*
* *
* * *
* *
*
input : 6
output:
Invalid line number
Solution:
import java.util.*;
public class Pattern4 {
public static void main(String[] args) {
Scanner inr = new Scanner(System.in);
int l = inr.nextInt();
int ul=0; // Upper Line
int ll=0; // Lower Line
// Check whether line number is odd
if (l%2!=0){
ul=(l/2)+1;
ll=l-ul;
//Code for upper half
for(int i=1;i<=ul; i++){
//Space management
for(int s=1;s<=(ul-i); s++){
System.out.print(" ");
}
// Star management
for(int j=1;j<=i; j++){
System.out.print("* ");
}
System.out.println();
}
//Code for lower half
int llc=ll;
for(int i=1;i<=ll; i++){
//Space management
for(int s=llc;s<ll; s++){
System.out.print(" ");
}
// Star management
for(int j=1;j-1<=ll-i; j++){
System.out.print(" *");
}
llc--;
System.out.println();
}
}
else{
System.out.print("Invalid line number");
}
}
}These are NPTEL Programming In Java Week 8 Assignment 8 Answers
Question 5
Write a program to display any digit(n) from 0-9 represented as a “7 segment display”.
For example:
input : 5
output :
_
|_
_|
input : 4
output :
|_|
|
Solution:
import java.util.*;
public class Pattern5 {
private static final Map<Integer, Integer> encodings =
new HashMap<Integer, Integer>();
static {
encodings.put(0, 0x7E);
encodings.put(1, 0x30);
encodings.put(2, 0x6D);
encodings.put(3, 0x79);
encodings.put(4, 0x33);
encodings.put(5, 0x5B);
encodings.put(6, 0x5F);
encodings.put(7, 0x70);
encodings.put(8, 0x7F);
encodings.put(9, 0x7B);
}
public static void printDigit(int digit) {
int code = encode(digit);
char[] bits =
String.format("%7s", Integer.toBinaryString(code))
.replace(' ', '0').toCharArray();
lightSegment(bits[0] == '1', " _ \n", " \n");
lightSegment(bits[5] == '1', "|", " ");
lightSegment(bits[6] == '1', "_", " ");
lightSegment(bits[1] == '1', "|\n", " \n");
lightSegment(bits[4] == '1', "|", " ");
lightSegment(bits[3] == '1', "_", " ");
lightSegment(bits[2] == '1', "|\n", " \n");
}
private static void lightSegment(boolean on, String onValue, String offValue) {
System.out.print(on ? onValue : offValue);
try {
Thread.sleep(0);
}
catch (InterruptedException e) {
e.printStackTrace();
}
}
private static int encode(int digit) {
return encodings.containsKey(digit) ? encodings.get(digit) : 0x00;
}
public static void main(String[] args) throws Exception {
Scanner inr = new Scanner(System.in);
int n = inr.nextInt();
printDigit(n);
}
}These are NPTEL Programming In Java Week 8 Assignment 8 Answers
More Weeks of Programming In Java: Click Here
More Nptel courses: https://progiez.com/nptel/
Session: JULY-DEC 2022
Course Name: Programming in Java NPTEL
These are NPTEL Programming In Java Week 8 Assignment 8 Answers
Q1. Which of the following is NOT a class of java.awt package?
a. Button
b. Component
c. Dialog
d. Paint
Answer: d
Q2. Which of the following is/are NOT an exception of java.awt package?
a. AWTEror
b. AWTException
c. FontFormatException
d. all of these
Answer: a
Q3. Which of the following method is/are a class button of java.awt package?
a. paint(Graphics g)
b. setLabel(String label)
c. getCurent()
d. getltem(int index)
Answer: b
These are NPTEL Programming In Java Week 8 Assignment 8 Answers
Q4. Which of the following container does not contain titlebar and menubar 2?
a. window
b. panel
c. container
d. frame
Answer: b
Q5. Which package provides many event classes and Listener interfaces for event handling?
a. java.awt.activeevent
b. java.awt.event
c. java.awt.listener
d. none of these
Answer: b
Q6. What is the name of the method used to get the current font of an graphic in java.awt.graphies?
a. abstract FontMetrics getFontMetrics(Font f)
b. abstract Font getFont()
c. FontMetrics getFontMetrics()
d. None of these
Answer: b
These are NPTEL Programming In Java Week 8 Assignment 8 Answers
Q7. Which of the following method remove all items from scrolling list in java.awt.list?
a. hide()
b. clear()
c. remove()
d. None
Answer: b
Q8. Which of the following statement is true about the update) in java.awt package?
a. Sets the color of the graphics context to be the foreground color of this component.
b. Calls this component’s paint method to completely redraw this component.
c. Clears this component by filling it with the background color.
d. All of these.
Answer: d
Q9. Which of the following methods can be used to return the current size size of a java.awt.Component object?
a. dimension()
b. setSize()
C. area()
d. size()
e. resize(0)
Answer: d. size()
These are NPTEL Programming In Java Week 8 Assignment 8 Answers
Q10. When we invoke update () for a java.awt.Component object, the A\VT invokes which of the following method?
a. show()
b. draw)
c. paint()
d. repaint()
Answer: c
Programming Assignment Solutions
Question: 1 Write a program which will print a pyramid of “*” ‘s of height “n” and print the number of “*” ‘s in the pyramid.
Solution:
//CodeThese are NPTEL Programming In Java Week 8 Assignment 8 Answers
Question: 2 Write a program which will print a pascal pyramid of “*” ‘s of height “l”.
Solution:
//CodeThese are NPTEL Programming In Java Week 8 Assignment 8 Answers
Question : 3 Write a program which will print a pyramid of “numbers” ‘s of height “n” and print the sum of all number’s in the pyramid.
Solution:
//CodeThese are NPTEL Programming In Java Week 8 Assignment 8 Answers
Question : 4 Write a program to print symmetric Pascal’s triangle of “*” ‘s of height “l” of odd length . If input “l” is even then your program will print “Invalid line number”.
Solution:
//CodeThese are NPTEL Programming In Java Week 8 Assignment 8 Answers
Question : 5 Write a program to display any digit(n) from 0-9 using “7 segment display“.
Solution:
//CodeThese are NPTEL Programming In Java Week 8 Assignment 8 Answers
More NPTEL Solutions: https://progiez.com/nptel
