The variable a is a float and the variable b is a double. Write a statement that will assign the value of b to a without causing an error when the program is compiled.
> What will the following program segments display? 1. x = 2; y = x++; System.out.println(y); 2. x = 2; System.out.println(x++); 3. x = 2; System.out.println(−−x); 4. x = 8; y = x−−; System.out.println(y);
> Write an if-else statement that assigns 1 to x when y is equal to 100. Otherwise, it should assign 0 to x.
> Write an if-else statement that assigns 20 to the variable y if the variable x is greater than 100. Otherwise, it should assign 0 to the variable y.
> Write a JavaFX CSS style definition that will be applied to all Label controls. The style definition should specify the following: font size: 24, font style: italic, font weight: bold.
> Write an if statement that displays “Goodbye†if the variable myCharacter Âcontains the character 'D'.
> Write an if statement that assigns 0 to the variable b and assigns 1 to the variable c if the variable a is less than 10.
> Write an if statement that assigns 20 to the variable y and assigns 40 to the Âvariable z if the variable x is greater than 100.
> Write an if statement that sets the variable fees to 50 if the boolean variable max is true.
> Assume the following declaration exists in a program: String name = "James"; Write a statement that uses System.out.printf to display the value of name in a field that is 20 spaces wide.
> Assume the following variable declaration exists in a program: double number = 123456.789; Write a statement that uses System.out.printf to display the value of the number variable left-justified, with comma separators, in a field that is 20 spaces wide,
> Assume the following variable declaration exists in a program: int number = 123456; Write a statement that uses System.out.printf to display the value of the number variable in a field that is 10 spaces wide, with comma separators.
> Assume the following variable declaration exists in a program: double number = 123.456; Write a statement that uses System.out.printf to display the value of the number variable padded with leading zeros, in a field that is eight spaces wide, rounded to
> Assume the following variable declaration exists in a program: double number = 123.456; Write a statement that uses System.out.printf to display the value of the number variable rounded to one decimal place, in a field that is 10 spaces wide.
> Write an if statement that assigns 0.2 to commission if sales is greater than or equal to 10000.
> Assume gridPane is the name of a GridPane container, and button is the name of a Button control. Write a statement that adds button to gridPane at column 2, row 5.
> Assume the following variable declaration exists in a program: double number = 1234567.456; Write a statement that uses System.out.printf to display the value of the number variable formatted as: 1,234,567.46
> What will the following code display? int funny = 7, serious = 15; funny = serious * 2; switch (funny) { case 0 : System.out.println("That is funny."); break; case 30: System.out.println("That is serious."); break; case 32: System.out.println("That is se
> What is wrong with the following switch statement? // This code has errors!!! switch (temp) { case temp < 0 : System.out.println("Temp is negative."); break; case temp = 0: System.out.println("Temp is zero."); break; case temp > 0 : System.out.println("T
> Explain why you cannot convert the following if-else-if statement into a switch statement. if (temp == 100)  x = 0; else if (population > 1000)  x = 1; else if (rate < .1)  x = −1;
> Rewrite the following if-else-if statement as a switch statement. if (selection == 'A') System.out.println("You selected A."); else if (selection == 'B') System.out.println("You selected B."); else if (selection == 'C') System.out.println("You selected C
> Complete the following program skeleton by writing a switch statement that displays “one†if the user has entered 1, “two†if the user has entered 2, and “three†if the user has entered 3. If a number other than 1, 2, or 3 is entered, the progra
> Rewrite the following if-else statements as statements that use the conditional operator. 1. if (x > y)  z = 1; else  z = 20; 2. if (temp > 45)  population = base * 10; else  population = base * 2; 3. if (hours > 40)  wages *= 1.5; else  wage
> Modify the statement you wrote in response to Checkpoint3.20 so it performs a case-insensitive comparison. Data from Checkpoint 3.20: Assume the variable name references a String object. Write an if statement that displays “Do I know you?†if the Str
> Assume the variables name1 and name2 reference two different String objects, containing different strings. Write code that displays the strings referenced by these variables in alphabetical order.
> Assume the variable name references a String object. Write an if statement that displays “Do I know you?†if the String object contains “Timothyâ€.
> Write a statement, after the following code, that creates an HBox container, adds the label1, label2, and label3 controls to it, and has 10 pixels of spacing between the controls. Label label1 = new Label("One"); Label label2 = new Label("Two"); Label la
> Write an if statement that multiplies payRate by 1.5 if hours is greater than 40.
> Write an if statement that displays the message "The number is not valid" if the variable speed is outside the range 0 through 200.
> Write an if statement that displays the message "The number is valid" if the variable speed is within the range 0 through 200.
> Assume the variables a = 2, b = 4, and c = 6. Circle the T or F for each of the ­following conditions to indicate whether it is true or false.
> The following truth table shows various combinations of the values true and false connected by a logical operator. Complete the table by circling T or F to indicate whether the result of such a combination is true or false.
> The following program is used in a bookstore to determine how many discount Âcoupons a customer gets. Complete the table that appears after the program. import javax.swing.JOptionPane; public class CheckPoint { public static void main(String[] args) { i
> What will the following program display? public class CheckPoint { public static void main(String[] args) { int funny = 7, serious = 15; funny = serious % 2; if (funny != 1) { funny = 0; serious = 0; } else if (funny == 2) { funny = 10; serious = 10; } E
> Write code that tests the variable x to determine whether it is greater than 0. If x is greater than 0, the code should test the variable y to determine whether it is less than 20. If y is less than 20, the code should assign 1 to the variable z. If y is
> Write nested if statements that perform the following test: If amount1 is greater than 10 and amount2 is less than 100, display the greater of the two.
> Write an if-else statement that assigns 0 to the variable b and assigns 1 to the variable c if the variable a is less than 10. Otherwise, it should assign −99 to the variable b and assign 0 to the variable c.
> Assume your JavaFX application is in the same directory as an image file named Cat.png. Write the code to create the Image and ImageView objects you will need to display the image.
> Write an if-else statement that assigns 0.10 to commission unless sales is greater than or equal to 50000.0, in which case it assigns 0.2 to commission.
> Write an if statement that assigns 0 to x when y is equal to 20.
> On paper, write a program that will display your name on the first line; your street address on the second line; your city, state, and ZIP code on the third line; and your telephone number on the fourth line. Place a comment with today’s date at the to
> Study the following program and show what it will print on the screen. // The Works of Wolfgang public class Wolfgang { public static void main(String[] args) { System.out.print("The works of Wolfgang\ninclude "); System.out.print("the following"); Syste
> The following program will not compile because the lines have been mixed up. System.out.print("Success\n"); } public class Success { System.out.print("Success\n"); public static void main(String[] args) System.out.print("Success "); } // It's a mad, mad
> Every Java application program must have ___. a. a method named main b. more than one class definition c. one or more comments
> All Java source code filenames must end with ____. a. a semicolon b. .class c. .java d. none of the above
> On paper, write a program that will display your name on the screen. Place a Âcomment with today’s date at the top of the program. Test your program by Âentering, compiling, and running it.
> Complete the following program skeleton so it displays the message “Hello World†on the screen. public class Hello { public static void main(String[] args) { // Insert code here to complete the program } }
> Assume that stringLength is an int variable. Write a statement that stores the length of the string referenced by the city variable in stringLength.
> Assume primaryStage references the Stage object, and scene references your Scene object. Write a statement that adds the scene to the stage.
> Write a statement that declares a String variable named city. The variable should be initialized so it references an object with the string “San Franciscoâ€.
> The following declaration appears in a program: short totalPay, basePay = 500, bonus = 1000; The following statement appears in the same program: totalPay = basePay + bonus; 1. Will the statement compile properly or cause an error? 2. If the statement ca
> Write statements using combined assignment operators to perform the following: 1. Add 6 to x 2. Subtract 4 from amount 3. Multiply y by 4 4. Divide total by 27 5. Store in x the remainder of x divided by 7
> Is the division statement in the following code an example of integer division or floating-point division? What value will be stored in portion? double portion; portion = 70 / 3;
> Complete the following table by writing the value of each expression in the Value column.
> What is wrong with the following statement? char letter = "Z";
> Which is a character literal, 'B' or "B"?
> When the program is saved to a file, what should the file be named?
> What are the Unicode codes for the characters ‘C’, ‘F’, and ‘W’?
> In question 11, you wrote the code for an event handler class, and in question 12, you wrote the code to register an instance of that class with the myButton control. Rewrite the code as a lambda expression.
> Write statements that do the following: 1. Declare a char variable named letter. 2. Assign the letter A to the letter variable. 3. Display the contents of the letter variable.
> What values can boolean variables hold?
> A program declares a float variable named number, and the following statement causes an error. What can be done to fix the error? number = 7.4;
> How would the number 6.31×1017 be represented in E notation?
> Refer to the Java primitive data types for this question. 1. If a variable needs to hold whole numbers in the range 32 to 6,000, what primitive data type would be best? 2. If a variable needs to hold whole numbers in the range −40,000 to +40,000, what
> Is the variable name Sales the same as sales? Why or why not?
> Which of the following are illegal variable names and why? x 99bottles july97 theSalesFigureForFiscalYear98 r&d grade_report
> What will the following program display on the screen? public class CheckPoint { public static void main(String[] args) { int number; number = 712; System.out.println("The value is " + "number"); } }
> Examine the following program. // This program uses variables and literals. public class BigLittle { public static void main(String[] args) { int little; int big; little = 2; big = 2000; System.out.println("The little number is " + little); System.out.pr
> The following program will not compile because the lines have been mixed up. public static void main(String[] args) } // A crazy mixed up program public class Columbus { System.out.println("In 1492 Columbus sailed the ocean blue."); } } When the lines ar
> Assume a JavaFX application has a Button control named myButton, and a Label control named outputLabel. Write an event handler class that can be used with the Button control. The event handler class should display the string “Hello World†in outputLab
> Write an if statement that assigns 100 to x when y is equal to 0.
> What import statement do you write in a program that uses the JOptionPane class?
> Write code that displays an input dialog asking the user to enter his or her age. Convert the input value to an int and store it in an int variable named age.
> Write code that will display each of the dialog boxes shown in Figure2-19.
> What is the purpose of the following types of dialog boxes? Message dialog Input dialog
> How are documentation comments different from other types of comments?
> How do you write a single line comment? How do you write a multi-line comment? How do you write a documentation comment?
> Assume that lowerCity is a String reference variable. Write a statement that stores the lowercase equivalent of the string referenced by the city variable in lowerCity.
> Assume that upperCity is a String reference variable. Write a statement that stores the uppercase equivalent of the string referenced by the city variable in upperCity.
> Assume that oneChar is a char variable. Write a statement that stores the first character in the string referenced by the city variable in oneChar.
> What is data hiding?
> Write a statement, after the following code, that creates an HBox container, and adds the label1, label2, and label3 controls to it: Label label1 = new Label("One"); Label label2 = new Label("Two"); Label label3 = new Label("Three");
> What is encapsulation?
> What are an object’s methods?
> What are an object’s attributes?
> In procedural programming, what two parts of a program are typically separated?
> What is the purpose of testing a program with sample data or input?
> Is a syntax error (such as misspelling a key word) found by the compiler or when the program is running?
> What is a runtime error?
> Describe what a compiler does with a program’s source code.
> What is pseudocode?
> What does it mean to “visualize a program running� What is the value of such an activity?
> Write a statement that creates an object that can be used to write binary data to the file Configuration.dat.
> What four items should you identify when defining what a program is to do?
> What is the JVM?
> What is byte code?
> What is a syntax error?
> What is a compiler?
> What happens to a variable’s current contents when a new value is stored there?
> Why are variables called “variable�
> Describe the difference between a program line and a statement.
