2: More types, Methods,
Conditionals
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Java Programming: Types, Methods, and Conditionals, Slides of Java Programming
An outline for a lecture on java programming, covering various types such as boolean, int, double, and string, as well as variables, operators, methods, and conditionals. It includes examples and explanations of concepts like division, order of operations, and conversion by casting.
Typology: Slides
2012/2013
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More types, Methods,
Conditionals
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Outline
�^
Lecture 1 Review
�^
More types
�^
Methods
�^
Conditionals
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Variables
Named location that stores a value Example:
String a = “a”;String b = “letter b”;a = “letter a”;String c = a + “ and “ + b;
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Operators
Symbols that perform simple computations Assignment: =Addition: +Subtraction:Multiplication: *Division: /
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finalPosition
= finalPosition +
initialVelocity * fallingTime;
finalPosition
= finalPosition + initialPosition;
OR
finalPosition
= initialVelocity * fallingTime;
finalPosition
= initialPosition;
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Questions from last lecture?
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Division
Division (“/”) operates differently on
integers and on doubles!
Example:
double a = 5.0/2.0;
a
int b = 4/2;
b
int c = 5/2;
// c = 2
double d = 5/2;
d
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Order of Operations
Precedence like math, left to rightRight hand side of = evaluated firstParenthesis increase precedence double x = 3 / 2 + 1;
// x = 2.
double y = 3 / (2 + 1); // y = 1.
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Conversion by casting
int
a = 2;
// a = 2
double a = 2;
// a = 2.0 (Implicit)
int
a = 18.7;
// ERROR
int
a = (int)18.7;
// a = 18
double a = 2/3;
// a = 0.
double a = (double)2/3;
// a = 0.6666…
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Outline
�^
Lecture 1 Review
�^
More types
�^
Methods
�^
Conditionals
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Adding Methods
public static void
NAME
STATEMENTS
} To call a method: NAME();
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class
NewLine
public static void
newLine
System
. out . println
} public static void
threeLines
newLine
newLine
newLine
} public static void
main
( String
[]
arguments
System
. out . println
( "Line 1"
threeLines
System
. out . println
( "Line 2"
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public static void
main
( String
[]
arguments
System
. out . println
( "Line 1"
threeLines
System
. out . println
( "Line 2"
public static void
threeLines
newLine
newLine
newLine
class
NewLine
public static void
newLine
System
. out . println
(^
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Parameters
public static void
NAME
( TYPE NAME
STATEMENTS
} To call: NAME(
EXPRESSION
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