SCJA-drills-chap03
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| Which compound assignment operators are covered on the exam? | The exam covers the following assignment and compound assignment operators: =, +=, and -=.
🗑
|
||||
| What does = do? What is it called? | The assignment operator (=) assigns values to variables.
🗑
|
||||
| What is the additional compound assignment operator used for? | The additional compound assignment operator is used for shorthand. As such, a=a+b is written a+=b.
🗑
|
||||
| What is the subtraction compound assignment operator used for? | The subtraction compound assignment operator is used for shorthand. As such, a=a-b is written a-=b.
🗑
|
||||
| Which arithmetic operators are covered on the exam? | The exam covers the following arithmetic operators: +, -, *, /, %, ++, and --.
🗑
|
||||
| What does + do? What is it called? | The addition operation (+) is used to add two operands together.
🗑
|
||||
| What does - do? What is it called? | The subtraction operator (-) is used to subtract the right operand from the left operand.
🗑
|
||||
| What does * do? What is it called? | The multiplication operator (*) is used to multiply two operands together.
🗑
|
||||
| What does / do? What is it called? | The divisor operator (/) is used to divide the right operand into the left operand.
🗑
|
||||
| What does % do? What is it called? | The modulus operator (%) returns the remainder of a division.
🗑
|
||||
| What does the prefix increment do? | The prefix increment (++) and prefix decrement (--) operators are used to increment or decrement a value before it is used in an expression.
🗑
|
||||
| What does the postfix increment do? | The postfix increment (++) and postfix decrement (--) operators are used to increment or decrement a value after it is used in an expression.
🗑
|
||||
| Which relational operators are covered on the exam? | The exam covers the following relational operators: <, <=, >, >=, ==, and !=.
🗑
|
||||
| What does < do? What is it called? | The “less than” operator (<) returns true if the left operand is less than the right operand.
🗑
|
||||
| What does <= do? What is it called? | The “less than or equal to” operator (<=) returns true if the left operand is less than or equal to the right operand.
🗑
|
||||
| What does > do? What is it called? | The “greater than” operator (>) returns true if the right operand is less than the left operand.
🗑
|
||||
| What does >= do? What is it called? | The “greater than or equal to” operator (>=) returns true if the right operand is less than or equal to the left operand.
🗑
|
||||
| What does == do? What is it called? | The “equal to” equality operator (==) returns true if the left operand is equal to the right operand.
🗑
|
||||
| What does != do? What is it called? | The “not equal to” equality operator (!=) returns true if the left operand is not equal to the right operand.
🗑
|
||||
| What can equality operators test? | Equality operators can test numbers, characters, Booleans, and reference variables.
🗑
|
||||
| Which logical operators are covered on the exam? | The exam covers the following logical operators: !, &&, and ||.
🗑
|
||||
| What does ! do? What is it called? | The logical negation (inversion) operator (!) negates the value of the boolean operand.
🗑
|
||||
| What does && do? What is it called? | The logical AND (conditional AND) operator (&&) returns true if both operands are true.
🗑
|
||||
| Which "interesting feature" does the logical AND have? | The logical AND operator is known as a short-circuit operator because it does not evaluate the right operand if the left operand is false.
🗑
|
||||
| What does || do? What is it called? | The logical OR (conditional OR) operator (||) returns true if either operand is true.
🗑
|
||||
| Which "interesting feature" does the logical AND have? | The conditional OR operator is known as a short-circuit operator because it does not evaluate the right operand if the left operand is true.
🗑
|
||||
| What is an object of the String class? | An object of the String class represents an immutable character string.
🗑
|
||||
| What does an object of the StringBuilder class represent? | An object of the StringBuilder class represents a mutable character string.
🗑
|
||||
| What does an object of the StringBuffer class represent? | An object of the StringBuffer class represents a thread-safe mutable character string.
🗑
|
||||
| What does mutable mean? How does it apply to Java? | Mutable means “changeable.” Note that Java variables such as primitives are mutable by default and can be made immutable by using the final keyword.
🗑
|
||||
| Give three classes which implement the CharSequence interface. | The CharSequence interface is implemented by the String, StringBuilder, and StringBuffer classes. It can be used as an argument in the String class’s replace method.
🗑
|
||||
| What is the + operator in relation to String? What does it do? | The string concatenation operator (+) joins two strings together.
🗑
|
||||
| What is the behaviour of the string concatenation operator joins two operands together? | The string concatenation operator will join two operands together, as long as one or both of them are strings.
🗑
|
||||
| What does the String class's charAt method return? | The String class’s charAt method returns a primitive char value from a specified int index value in relationship to the referenced string.
🗑
|
||||
| What does the String class's indexOf method return? | The String class’s indexOf methods returns a primitive int value representing the index of a character or string in relationship to the referenced string.
🗑
|
||||
| What does the String class's length method return? | The String class’s length method returns a primitive int value representing the length of the referenced string.
🗑
|
||||
| What does the String class's replace method return? | The String class’s replace methods return strings replacing all characters or strings in relationship to the referenced string.
🗑
|
||||
| What does the String class's startsWith method return? | The String class’s startsWith method returns a primitive boolean value representing the results of a test to see if the supplied prefix starts the referenced string.
🗑
|
||||
| What does the String class's endsWith method return? | The String class’s endsWith method returns a primitive boolean value representing the results of a test to see if the supplied suffix ends the referenced string.
🗑
|
||||
| What does the String class's substring method return? | The String class’s substring methods return new strings that are substrings of the referenced string.
🗑
|
||||
| What does the String class's trim method return? | The String class’s trim method returns the entire string minus leading and trailing whitespace characters in relationship to the referenced string.
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
fd99
Popular Computers sets