defines a new data type (a classification). It is the formal implementation, or blueprint, of the attributes and behaviors of the objects of that class.
class
New cards
2
a specific instance of a class with defined attributes.
object
New cards
3
data the object knows about itself
attributes
New cards
4
variables in a class that define the attributes for objects
instance variables
New cards
5
these define the behaviors or functions for objects to describe what objects can do
methods
New cards
6
creates a new object and initializes its attributes (they have the same name as the class).
constructor
New cards
7
used to create a new object; every object is created using this keyword followed by a call to one of the class's constructors that initializes the object's attributes
new
New cards
8
the constructor name followed by the parameter list
**constructor signature or header**
New cards
9
**the method name followed by the parameter list**
method signature or header
New cards
10
classes that create objects from primitive types, for example the Integer class and Double class
**wrapper classes**
New cards
11
used to indicate that an object reference doesn't refer to any object yet
null
New cards
12
**Returns the absolute value of an int value**
\ **(which means no negatives).**
\ **Math method: int abs(int)**
New cards
13
Returns the value of the first parameter raised to the power of the second parameter.
**Math method: double pow(double, double)**
New cards
14
**Returns the positive square root of a double value.**
**method: double sqrt(double)**
New cards
15
**Returns a random double value greater than or equal to 0.0 and less than 1.0 (not including 1.0)!**
**Math.random()**
New cards
16
a list of the types and variable names for the arguments being passed to a method or constructor
\ **parameter list**
New cards
17
\ **creating multiple methods or constructors with the same name but different number or types of parameters.**
overloading
New cards
18
\ **When you call a method or constructor and give it an argument, a copy of the argument's value is saved in the parameter variable.**
\ **call by value**
New cards
19
\ **This is the error if you try to call an object method on an object variable whose value is null**
NullPointerException
New cards
20
**These methods must be called using an object name method name.**
**non-static or object method**
New cards
21
**These methods belong to a class and can be called by using the class name instead of creating an object.**
**static method**
New cards
22
**The value returned from a method to the calling method**
return value
New cards
23
objects of the String class that hold sequences of characters.
strings
New cards
24
a number associated with a position in a string (or array)
index
New cards
25
String methods do not change the String object. Any method that seems to change a string actually creates a new string.
immutable
New cards
26
part of a string (the method will create a new string that contains a copy of part of the original string).
substring
New cards
27
returns the number of characters in a String object.
String method: int length()
New cards
28
returns the substring beginning at index from and ending at index (to - 1).
String substring(int from, int to)
New cards
29
returns substring(from, length()).
String substring(int from)
New cards
30
returns the index of the first occurrence of str; returns -1 if not found.
int indexOf(String str)
New cards
31
returns true if this (the calling object) is equal to other; returns false otherwise
boolean equals(String other)
New cards
32
returns a value < 0 if this is less than other; returns zero if this is equal to other; returns a value > 0 if this is greater than other.
int compareTo(String other)
New cards
33
returns a single character at position index
**substring(index, index+ 1)**
New cards
34
the automatic conversion of primitive types to their corresponding object wrapper classes, for example int to Integer.
autoboxing
New cards
35
the automatic conversion of wrapper class to the primitive type, for example Integer to int.
unboxing
New cards
36
moves the random number into a range starting from a minimum number where the range is the (max number - min number + 1)
Studied by 5 people
