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What is the output of the Java code snippet System.out.println(Math.pow(2, 3));?
What is the output of the Java code snippet System.out.println(Math.pow(2, 3));?
- 6
- 8.0 (correct)
- 16
- 9
What is a number literal in Java?
What is a number literal in Java?
- A variable that stores a numerical value.
- A keyword that represents a data type.
- A mathematical operation.
- A constant value that appears directly in the program. (correct)
What is the data type of the literal 5.0 in Java?
What is the data type of the literal 5.0 in Java?
- float
- double (correct)
- int
- long
What is the purpose of the System.currentTimeMillis() method?
What is the purpose of the System.currentTimeMillis() method?
What is the difference between the ++i and i++ operators?
What is the difference between the ++i and i++ operators?
What is type casting in Java?
What is type casting in Java?
What is Unicode?
What is Unicode?
What is the purpose of the Character.isDigit() method?
What is the purpose of the Character.isDigit() method?
Flashcards
Math.pow(2, 3) output
Math.pow(2, 3) output
The Java method Math.pow(2, 3) calculates 2 raised to the power of 3, resulting in 8.0.
Number literal (Java)
Number literal (Java)
A fixed value that directly appears in a Java program, representing a number.
Data type of 5.0
Data type of 5.0
In Java, 5.0 is a double-precision floating-point number literal.
System.currentTimeMillis()
System.currentTimeMillis()
A Java method that returns the current time in milliseconds from the Unix epoch.
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++i vs i++
++i vs i++
++i increments i BEFORE use; i++ increments i AFTER use.
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Type casting (Java)
Type casting (Java)
Converting a variable from one data type to another in Java.
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int i = (int)3.9; Output
int i = (int)3.9; Output
This code casts the floating-point value 3.9 to an integer, resulting in the integer 3.
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int variable stores
int variable stores
A variable that holds a whole number.
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Character data type
Character data type
A single character using the 'char' data type.
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Unicode
Unicode
A character encoding scheme which assigns unique numbers to characters.
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Escape sequence (Java)
Escape sequence (Java)
A sequence of characters in Java representing a special character or format.
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Character.isDigit()
Character.isDigit()
A Java method that checks if a character is a digit.
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String data type
String data type
A sequence of characters in Java.
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String.length()
String.length()
A Java method that gets the number of characters in a string.
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Java Variable Declaration and Output
Math.pow(2, 3): Outputs 8.0- Number Literal: A constant numerical value appearing directly in the code.
5.0data type:double
System.currentTimeMillis() Method
- Purpose: Returns current time in milliseconds since the Unix epoch.
Increment Operators (++i and i++)
++i: Increments the value ofibefore use in the expression.i++: Increments the value ofiafter use in the expression.
Type Casting in Java
- Definition: Converting a variable from one data type to another.
Java Random Integer Generation (1-10)
- Not described in the given text. Assumed to be from a separate Java code section about random integer generation.
Character Data Type
charstores a single character.
Unicode
Unicodeis a 16-bit character encoding scheme.
Escape Sequences
- Sequence of characters representing a special character.
Character.isDigit() Method
- Purpose: Checks if a character is a digit.
String Data Type
Stringstores a sequence of characters.
String.length() Method
- Purpose: Returns the number of characters in a string.
String.charAt() Method
- Purpose: Returns the character at a specific index in a string.
String.concat() Method
- Purpose: Concatenates two strings (joins them together).
Example Java Code Output (int i = (int)3.9;)
- Output is 3. (integer part)
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