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public void setX(int newX) { | This function takes an int called newX. | We define this method as public to provide access to this method from outside of the class. | 1 |
public void setX(int newX) { | This function takes an int called newX. | 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. | 4 |
public void setX(int newX) { | This function takes an int called newX. | Note that the instance variable x is private; thus, it cannot be directly changed from outside the class. | 1 |
public void setX(int newX) { | This function takes an int called newX. | The parameter of the method is declared as integer because the x-coordinate of the point is an integer. | 3 |
public void setX(int newX) { | This function takes an int called newX. | It can be changed from outside the class only through this method. | 1 |
public int getX() { | Creates a function called getX that returns the int x in the Point1 class. | We define this method as public to provide access to this method from outside of the class. | 1 |
public int getX() { | Creates a function called getX that returns the int x in the Point1 class. | This method returns the x-coordinate of the point. | 5 |
public int getX() { | Creates a function called getX that returns the int x in the Point1 class. | Note that the instance variable x is private; thus, it cannot be directly accessed from outside the class. | 1 |
public int getX() { | Creates a function called getX that returns the int x in the Point1 class. | Also, we define its return type as int, as it returns the x-coordinate of the point which is an integer. | 3 |
public int getX() { | Creates a function called getX that returns the int x in the Point1 class. | It can be accessed from outside the class only through this getter method. | 1 |
public void setX(int newX) { | Creates a function called setX, that sets the x int in the Point1 class. | Also, we define its return type as void, as it does not return any value. | 1 |
public void setX(int newX) { | Creates a function called setX, that sets the x int in the Point1 class. | We define this method as public to provide access to this method from outside of the class. | 1 |
public void setX(int newX) { | Creates a function called setX, that sets the x int in the Point1 class. | 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. | 4 |
public void setX(int newX) { | Creates a function called setX, that sets the x int in the Point1 class. | Note that the instance variable x is private; thus, it cannot be directly changed from outside the class. | 1 |
public void setX(int newX) { | Creates a function called setX, that sets the x int in the Point1 class. | 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) { | Creates a function called setX, that sets the x int in the Point1 class. | It can be changed from outside the class only through this method. | 1 |
public void setX(int newX) { | This function takes an int called newX. | Also, we define its return type as void, as it does not return any value. | 1 |
public void setX(int newX) { | This function takes an int called newX. | We define this method as public to provide access to this method from outside of the class. | 1 |
public void setX(int newX) { | This function takes an int called newX. | 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. | 3 |
public void setX(int newX) { | This function takes an int called newX. | Note that the instance variable x is private; thus, it cannot be directly changed from outside the class. | 1 |
public void setX(int newX) { | This function takes an int called newX. | The parameter of the method is declared as integer because the x-coordinate of the point is an integer. | 3 |
public void setX(int newX) { | This function takes an int called newX. | It can be changed from outside the class only through this method. | 1 |
Scanner scan = new Scanner(System.in); | Allows the user to send input to the machine. | To read the input value from the user, we need to define a Scanner object. | 2 |
Scanner scan = new Scanner(System.in); | Allows the user to send input to the machine. | We need to read and process the integer that the user enters. | 4 |
System.out.println("Enter an integer: "); | Prints the line that says "Enter the integer: " on the machine. | We prompt the user to enter an integer. | 4 |
int num = scan.nextInt(); | Takes the next input from the user and initializes the int num to the input. | We read the input integer by calling the nextInt() method because this input is an integer. | 4 |
int num = scan.nextInt(); | Takes the next input from the user and initializes the int num to the input. | We need to read the integer that the user enters and store it in a variable. | 4 |
scan.close(); | Ends the ability of the user to send input to the machine. | We close the scanner as we do not want to process any input from the user in the rest of the program. | 2 |
if ( num > 0 ) { | if the int num is greater than 0 enter the if statement. | If the integer is neither positive nor negative, then we could conclude that the integer is zero. | 2 |
if ( num > 0 ) { | if the int num is greater than 0 enter the if statement. | The conditions that tests for the integer's sign are mutually exclusive (i.e., one and only one of the conditions can be true); therefore, their order does not matter. | 1 |
if ( num > 0 ) { | if the int num is greater than 0 enter the if statement. | To determine the sign of the integer, we need to perform two tests: one for determining whether the integer is positive and one for determining whether the integer is negative. | 2 |
if ( num > 0 ) { | if the int num is greater than 0 enter the if statement. | Also, it is better to use if-else if statements instead of sequential if statements because an integer has only one sign and once we find the sign, we don't need to perform more tests. | 1 |
if ( num > 0 ) { | if the int num is greater than 0 enter the if statement. | If both of these tests fail, then we could conclude that the integer is zero. | 2 |
System.out.println("The integer is positivie."); | Prints the line "The integer is positive." due to the if statement condition | This statement prints that the integer is positive. | 4 |
System.out.println("The integer is positivie."); | Prints the line "The integer is positive." due to the if statement condition | The printed text is followed by the end-of-line character at the end. | 1 |
} else if ( num < 0 ) { | If the int num is less than 0 enter the else if statement. | If the first test fails (i.e., when the integer is not positive), we need to test if the integer is negative. | 2 |
System.out.println("The integer is negative."); | Prints the line "The integer is negative." due to the conditional else if statement. | The printed text is followed by the end-of-line character at the end. | 1 |
System.out.println("The integer is negative."); | Prints the line "The integer is negative." due to the conditional else if statement. | This statement prints that the integer is negative. | 4 |
System.out.println("The integer is zero."); | Print the line "The integer is zero." because the previous if and else if statements were false. | The printed text is followed by the end-of-line character at the end. | 1 |
System.out.println("The integer is zero."); | Print the line "The integer is zero." because the previous if and else if statements were false. | This statement prints that the integer is zero. | 4 |
} else { | If the previous if and else if statements are false, enters the else statement. | We need to end the above if-else if statements with an else statement that its body is executed when none of the above tests are true, that is when the integer is zero. | 4 |
int [] arr = { 1, 2, 3}; | Creates an array arr that has 3 ints: 1, 2, and 3. | We initialize the array of type int to hold the specified numbers. | 4 |
int [] arr = { 1, 2, 3}; | Creates an array arr that has 3 ints: 1, 2, and 3. | We initialize the array by separating elements with a comma and enclosing the collection in braces { }. | 2 |
for ( int i = 0; i < arr.length; i++ ) { | Creates a for loop that will loop through each element of the arr array. | We want to iterate over the array and increment each element in the array by 1. | 3 |
for ( int i = 0; i < arr.length; i++ ) { | Creates a for loop that will loop through each element of the arr array. | To really change the array as we march across it, we need to use indexes so we can assign an updated value to each position as we go. | 2 |
for ( int i = 0; i < arr.length; i++ ) { | Creates a for loop that will loop through each element of the arr array. | We need the array indexes to start at 0 (array indexes start from 0) with every integer number up to but not including the array length. | 1 |
arr[i] += 1; | Increases the int in the arr array at the index i by 1. | This statement increments the element at the index i of the array by 1. | 5 |
arr[i] += 1; | This will be done for each loop and will satisfy the goal description. | This statement increments the element at the index i of the array by 1. | 1 |
for (int num = 2; num <= 10; num += 2) { | runs from 2 to 10, adding to to num each iteration | To do this, we need to use a loop structure. | 2 |
for (int num = 2; num <= 10; num += 2) { | runs from 2 to 10, adding to to num each iteration | We need to repeat the same process for each of the even positive integers that are less than or equal to 10. | 3 |
for (int num = 2; num <= 10; num += 2) { | runs from 2 to 10, adding to to num each iteration | 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. | 3 |
for (int num = 2; num <= 10; num += 2) { | runs from 2 to 10, adding to to num each iteration | 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) { | runs from 2 to 10, adding to to num each iteration | 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 |
System.out.println(num + " squared = " + (num * num)); | provides output of each num added to "squared" added to num times num | The multiplication may also be performed directly in the println statement. | 2 |
System.out.println(num + " squared = " + (num * num)); | provides output of each num added to "squared" added to num times num | Note that we do not necessarily have to store the squared number in a variable. | 2 |
System.out.println(num + " squared = " + (num * num)); | provides output of each num added to "squared" added to num times num | To square each number in the sequence, we multiply it by itself using the multiplication (*) operator. | 2 |
System.out.println(num + " squared = " + (num * num)); | provides output of each num added to "squared" added to num times num | In each iteration of the loop, this statement prints the square number to the default standard output stream. | 3 |
Point1 point = new Point1(); | creates a new set of Point with pointer name "point" | This statement creates a Point1 object using the new keyword and empty parentheses. | 2 |
Point1 point = new Point1(); | creates a new set of Point with pointer name "point" | The variable point holds a reference to a Point1 object. | 4 |
point.setX(7); | sets the X value of point to 7 | This statement invokes the method setX of the point to set its x-coordinate to 7. | 4 |
point.translate(11, 6); | moves the X,Y points to (11,6) | This statement invokes the method translate of the point. | 2 |
point.translate(11, 6); | moves the X,Y points to (11,6) | The second parameter specifies how much we want to shift the y-coordinate of the point. | 2 |
point.translate(11, 6); | moves the X,Y points to (11,6) | The translate method receives two parameters. | 2 |
point.translate(11, 6); | moves the X,Y points to (11,6) | The first parameter specifies how much we want to shift the x-coordinate of the point. | 2 |
point.translate(11, 6); | moves the X,Y points by adding (11,6) | This statement invokes the method translate of the point. | 1 |
point.translate(11, 6); | moves the X,Y points by adding (11,6) | The second parameter specifies how much we want to shift the y-coordinate of the point. | 2 |
point.translate(11, 6); | moves the X,Y points by adding (11,6) | The translate method receives two parameters. | 1 |
point.translate(11, 6); | moves the X,Y points by adding (11,6) | The first parameter specifies how much we want to shift the x-coordinate of the point. | 2 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ; | Outputs the new X,Y coordinates | 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() + ")") ; | Outputs the new X,Y coordinates | We could use the returned value of them directly in the println statement. | 2 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ; | Outputs the new X,Y coordinates | This statement prints the coordinates of the point to the default standard output stream. | 4 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ; | Outputs the new X,Y coordinates | The printed text is followed by the end-of-line character at the end. | 2 |
System.out.println("The point's coordinates: (" + point.getX() + ", " + point.getY() + ")") ; | Outputs the new X,Y coordinates | To get the point's coordinates, we invoke the method getX and getY of the point. | 1 |
class Point1 { | begins to define the class Point1 | We define the class Point1 to represent a point in the Euclidean plane. | 4 |
private int y; | creates a private integer, y | Therefore, we need to declare an instance variable for the class to store the y-coordinate of the point. | 3 |
private int y; | creates a private integer, y | We declare it as integer because we want to have integer coordinates for the point. | 3 |
private int y; | creates a private integer, 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. | 2 |
private int y; | creates a private integer, y | Every object of the Point1 class will have its own y-coordinate. | 3 |
public void translate(int dx, int dy) { | creates "translate" with dependent integers dx and dy | 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) { | creates "translate" with dependent integers dx and dy | 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) { | creates "translate" with dependent integers dx and dy | Also, we define its return type as void, as it does not return any value. | 1 |
public void translate(int dx, int dy) { | creates "translate" with dependent integers dx and dy | Note that both of the parameters are declared as integers because the point has integer coordinates. | 2 |
x += dx; | adds x dx and defines new dx as this sum | To shift the x-coordinate of the point, we need to add dx to the value of the x-coordinate of the point. | 2 |
public void setX(int newX) { | assigns new setX with dependent variable newX | Also, we define its return type as void, as it does not return any value. | 1 |
public void setX(int newX) { | assigns new setX with dependent variable newX | We define this method as public to provide access to this method from outside of the class. | 1 |
public void setX(int newX) { | assigns new setX with dependent variable newX | 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) { | assigns new setX with dependent variable newX | Note that the instance variable x is private; thus, it cannot be directly changed from outside the class. | 1 |
public void setX(int newX) { | assigns new setX with dependent variable newX | 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) { | assigns new setX with dependent variable newX | It can be changed from outside the class only through this method. | 1 |
public void setX(int newX) { | creates a new setX with dependent variable newX | Also, we define its return type as void, as it does not return any value. | 1 |
public void setX(int newX) { | creates a new setX with dependent variable newX | We define this method as public to provide access to this method from outside of the class. | 1 |
public void setX(int newX) { | creates a new setX with dependent variable newX | 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) { | creates a new setX with dependent variable newX | Note that the instance variable x is private; thus, it cannot be directly changed from outside the class. | 1 |
public void setX(int newX) { | creates a new setX with dependent variable newX | 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) { | creates a new setX with dependent variable newX | It can be changed from outside the class only through this method. | 1 |
public int getX() { | creates a public integer getX, with dependent variable x | We define this method as public to provide access to this method from outside of the class. | 1 |
public int getX() { | creates a public integer getX, with dependent variable x | This method returns the x-coordinate of the point. | 1 |
public int getX() { | creates a public integer getX, with dependent variable x | Note that the instance variable x is private; thus, it cannot be directly accessed from outside the class. | 1 |
public int getX() { | creates a public integer getX, with dependent variable x | 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() { | creates a public integer getX, with dependent variable x | It can be accessed from outside the class only through this getter method. | 1 |