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System.out.println(num + " squared = " + (num * num)); | print square value of the num in the each iteration in the console | In each iteration of the loop, this statement prints the square number to the default standard output stream. | 4 |
Point1 point = new Point1(); | initiate the class Point 1 | This statement creates a Point1 object using the new keyword and empty parentheses. | 2 |
Point1 point = new Point1(); | initiate the class Point 1 | The variable point holds a reference to a Point1 object. | 2 |
point.setX(7); | call the setX method with parameter 7 | This statement invokes the method setX of the point to set its x-coordinate to 7. | 3 |
point.translate(11, 6); | call translate method with variables 11, 6 | This statement invokes the method translate of the point. | 2 |
point.translate(11, 6); | call translate method with variables 11, 6 | The second parameter specifies how much we want to shift the y-coordinate of the point. | 1 |
point.translate(11, 6); | call translate method with variables 11, 6 | The translate method receives two parameters. | 2 |
point.translate(11, 6); | call translate method with variables 11, 6 | The first parameter specifies how much we want to shift the x-coordinate of the point. | 1 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ; | print the coordinates x,y using methods getX and getY | Note that we do not necessarily have to store the returned value from each of these methods in a variable. | 1 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ; | print the coordinates x,y using methods getX and getY | We could use the returned value of them directly in the println statement. | 1 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ; | print the coordinates x,y using methods getX and getY | This statement prints the coordinates of the point to the default standard output stream. | 3 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ; | print the coordinates x,y using methods getX and getY | The printed text is followed by the end-of-line character at the end. | 1 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ; | print the coordinates x,y using methods getX and getY | To get the point's coordinates, we invoke the method getX and getY of the point. | 3 |
class Point1 { | class Point 1 definition start | We define the class Point1 to represent a point in the Euclidean plane. | 3 |
private int y; | declare the variable y | Therefore, we need to declare an instance variable for the class to store the y-coordinate of the point. | 2 |
private int y; | declare the variable y | We declare it as integer because we want to have integer coordinates for the point. | 1 |
private int y; | declare the variable y | Note that an instance variable is a variable defined in a class, for which each instantiated object of the class has a separate copy, or instance. | 1 |
private int y; | declare the variable y | Every object of the Point1 class will have its own y-coordinate. | 1 |
public void translate(int dx, int dy) { | translate method definition | This method shifts the coordinates by a specific delta-x and delta-y, which are passed as parameters. | 2 |
public void translate(int dx, int dy) { | translate method definition | We define this method as public to provide access to this method from outside of the class. | 1 |
public void translate(int dx, int dy) { | translate method definition | Also, we define its return type as void, as it does not return any value. | 1 |
public void translate(int dx, int dy) { | translate method definition | Note that both of the parameters are declared as integers because the point has integer coordinates. | 1 |
x += dx; | X=X+dx | To shift the x-coordinate of the point, we need to add dx to the value of the x-coordinate of the point. | 3 |
public void setX(int newX) { | setX method definition | Also, we define its return type as void, as it does not return any value. | 1 |
public void setX(int newX) { | setX method definition | We define this method as public to provide access to this method from outside of the class. | 1 |
public void setX(int newX) { | setX method definition | This method sets the current value of the x-coordinate of the point to the given value (newX) that is specified as the method's parameter. | 2 |
public void setX(int newX) { | setX method definition | Note that the instance variable x is private; thus, it cannot be directly changed from outside the class. | 1 |
public void setX(int newX) { | setX method definition | The parameter of the method is declared as integer because the x-coordinate of the point is an integer. | 1 |
public void setX(int newX) { | setX method definition | It can be changed from outside the class only through this method. | 1 |
public int getX() { | getX method definition | We define this method as public to provide access to this method from outside of the class. | 2 |
public int getX() { | getX method definition | This method returns the x-coordinate of the point. | 2 |
public int getX() { | getX method definition | Note that the instance variable x is private; thus, it cannot be directly accessed from outside the class. | 1 |
public int getX() { | getX method definition | Also, we define its return type as int, as it returns the x-coordinate of the point which is an integer. | 1 |
public int getX() { | getX method definition | It can be accessed from outside the class only through this getter method. | 2 |
for (int num = 2; num <= 10; num += 2) { | line 3 starts the "for" loop. | To do this, we need to use a loop structure. | 3 |
for (int num = 2; num <= 10; num += 2) { | line 3 starts the "for" loop. | We need to repeat the same process for each of the even positive integers that are less than or equal to 10. | 1 |
for (int num = 2; num <= 10; num += 2) { | line 3 starts the "for" loop. | To do this, we initialize variable num to 2, loop until reaching 10 (inclusive), and increment num by 2 after each iteration of the loop. | 1 |
for (int num = 2; num <= 10; num += 2) { | line 3 starts the "for" loop. | We use for loops instead of a while loop because we need to repeat the loop a certain number of times, and for loops are best-suited in cases like this when we know ahead of time the number of times that we need to repeat the loop. | 2 |
for (int num = 2; num <= 10; num += 2) { | line 3 starts the "for" loop. | Here, we want the for loop to start counting from 2 (2 is the first positive even number) with every even integer number up to (including) 10. | 2 |
for (int num = 2; num <= 10; num += 2) { | As the goal states we have to obtain the square of every even number that is lower than 10, the loop starts with 2. | To do this, we need to use a loop structure. | 2 |
for (int num = 2; num <= 10; num += 2) { | As the goal states we have to obtain the square of every even number that is lower than 10, the loop starts with 2. | We need to repeat the same process for each of the even positive integers that are less than or equal to 10. | 2 |
for (int num = 2; num <= 10; num += 2) { | As the goal states we have to obtain the square of every even number that is lower than 10, the loop starts with 2. | To do this, we initialize variable num to 2, loop until reaching 10 (inclusive), and increment num by 2 after each iteration of the loop. | 2 |
for (int num = 2; num <= 10; num += 2) { | As the goal states we have to obtain the square of every even number that is lower than 10, the loop starts with 2. | We use for loops instead of a while loop because we need to repeat the loop a certain number of times, and for loops are best-suited in cases like this when we know ahead of time the number of times that we need to repeat the loop. | 2 |
for (int num = 2; num <= 10; num += 2) { | As the goal states we have to obtain the square of every even number that is lower than 10, the loop starts with 2. | Here, we want the for loop to start counting from 2 (2 is the first positive even number) with every even integer number up to (including) 10. | 3 |
for (int num = 2; num <= 10; num += 2) { | it is incremented by 2 every time, so we get the next even number. | To do this, we need to use a loop structure. | 1 |
for (int num = 2; num <= 10; num += 2) { | it is incremented by 2 every time, so we get the next even number. | We need to repeat the same process for each of the even positive integers that are less than or equal to 10. | 2 |
for (int num = 2; num <= 10; num += 2) { | it is incremented by 2 every time, so we get the next even number. | To do this, we initialize variable num to 2, loop until reaching 10 (inclusive), and increment num by 2 after each iteration of the loop. | 2 |
for (int num = 2; num <= 10; num += 2) { | it is incremented by 2 every time, so we get the next even number. | We use for loops instead of a while loop because we need to repeat the loop a certain number of times, and for loops are best-suited in cases like this when we know ahead of time the number of times that we need to repeat the loop. | 1 |
for (int num = 2; num <= 10; num += 2) { | it is incremented by 2 every time, so we get the next even number. | Here, we want the for loop to start counting from 2 (2 is the first positive even number) with every even integer number up to (including) 10. | 2 |
for (int num = 2; num <= 10; num += 2) { | Num<= 10 condition is to get numbers that are lesser than or equal to 10. | To do this, we need to use a loop structure. | 1 |
for (int num = 2; num <= 10; num += 2) { | Num<= 10 condition is to get numbers that are lesser than or equal to 10. | We need to repeat the same process for each of the even positive integers that are less than or equal to 10. | 2 |
for (int num = 2; num <= 10; num += 2) { | Num<= 10 condition is to get numbers that are lesser than or equal to 10. | To do this, we initialize variable num to 2, loop until reaching 10 (inclusive), and increment num by 2 after each iteration of the loop. | 2 |
for (int num = 2; num <= 10; num += 2) { | Num<= 10 condition is to get numbers that are lesser than or equal to 10. | We use for loops instead of a while loop because we need to repeat the loop a certain number of times, and for loops are best-suited in cases like this when we know ahead of time the number of times that we need to repeat the loop. | 1 |
for (int num = 2; num <= 10; num += 2) { | Num<= 10 condition is to get numbers that are lesser than or equal to 10. | Here, we want the for loop to start counting from 2 (2 is the first positive even number) with every even integer number up to (including) 10. | 2 |
System.out.println(num + " squared = " + (num * num)); | line 4 is just to print the output. | The multiplication may also be performed directly in the println statement. | 1 |
System.out.println(num + " squared = " + (num * num)); | line 4 is just to print the output. | Note that we do not necessarily have to store the squared number in a variable. | 1 |
System.out.println(num + " squared = " + (num * num)); | line 4 is just to print the output. | To square each number in the sequence, we multiply it by itself using the multiplication (*) operator. | 1 |
System.out.println(num + " squared = " + (num * num)); | line 4 is just to print the output. | In each iteration of the loop, this statement prints the square number to the default standard output stream. | 1 |
System.out.println(num + " squared = " + (num * num)); | Every-time the next even number will taken, it will printed and the with the formula of "num*num" its square will be obtained and printed. | The multiplication may also be performed directly in the println statement. | 2 |
System.out.println(num + " squared = " + (num * num)); | Every-time the next even number will taken, it will printed and the with the formula of "num*num" its square will be obtained and printed. | Note that we do not necessarily have to store the squared number in a variable. | 1 |
System.out.println(num + " squared = " + (num * num)); | Every-time the next even number will taken, it will printed and the with the formula of "num*num" its square will be obtained and printed. | To square each number in the sequence, we multiply it by itself using the multiplication (*) operator. | 3 |
System.out.println(num + " squared = " + (num * num)); | Every-time the next even number will taken, it will printed and the with the formula of "num*num" its square will be obtained and printed. | In each iteration of the loop, this statement prints the square number to the default standard output stream. | 3 |
Point1 point = new Point1(); | Line 3 is just a declaration of a new object of type "Point1". | This statement creates a Point1 object using the new keyword and empty parentheses. | 3 |
Point1 point = new Point1(); | Line 3 is just a declaration of a new object of type "Point1". | The variable point holds a reference to a Point1 object. | 2 |
point.setX(7); | By using the function setX, the value 7 is passed to the object. | This statement invokes the method setX of the point to set its x-coordinate to 7. | 3 |
point.setX(7); | It will be an x-coordinate. | This statement invokes the method setX of the point to set its x-coordinate to 7. | 1 |
point.translate(11, 6); | With the function "translate", the x and y co-ordinates of the point will be moved to 11 and 6 respectively. | This statement invokes the method translate of the point. | 3 |
point.translate(11, 6); | With the function "translate", the x and y co-ordinates of the point will be moved to 11 and 6 respectively. | The second parameter specifies how much we want to shift the y-coordinate of the point. | 1 |
point.translate(11, 6); | With the function "translate", the x and y co-ordinates of the point will be moved to 11 and 6 respectively. | The first parameter specifies how much we want to shift the x-coordinate of the point. | 2 |
point.translate(11, 6); | With the function "translate", the x and y co-ordinates of the point will be moved to 11 and 6 respectively. | The translate method receives two parameters. | 1 |
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