An object is the actual storage space in memory in which some collection of data resides.
A reference variable is a variable which refers to the memory location of an object.
Look at the pseudocode below:
Object obj = new Object();
Here obj is the reference variable, and the data to which it refers is the object.
Strictly speaking, a reference is not a variable of any kind, thus there is no such thing as a "reference variable". A variable is a memory address in which we can store a single value whereas a reference is simply an alternate name for an existing variable.
A variable's reference is a reference to where the value of the variable is being stored in memory. A variable's value is the true assignment value of the variable.
http://www.coderanch.com/t/399872/java/java/Difference-instance-variable-reference-variable
The structure tag is a type. The structure variable is an instance of that type.
Instantiation is creating the instance of the variable/object . While Initialization is to provide the variable with some value. int i; // i is an instance of an integer i=10; //initialised with the value 10
difference between constant and static variables in java
Reference VariableIt does not have separate memory other than variableIt is just an alias created to existing variableIt is not present C languagePointer VariableIt has separate memory other than variableIt actually stores address of the variableIt is present in C as well as C++.
Typically if one sets a variable like int x = 100; it is value semantics, But if one creates an array, like int[] list = new list[10]; it is referring the location, so it is reference semantics.
The structure tag is a type. The structure variable is an instance of that type.
When a variable is passed by value, the function receives a copy of the variable. When a variable is passed by reference, the function receives a reference, or pointer, to the original data.
An instance variable is typically associated with an object instance of the class whereas class variable is not associated with any object instance. Static variables are referred to as class variables while non-static regular variables are called instance variables. Simply put, you will have as many instances of the instance variable as there are object instances. i.e., if there are 10 instances of an object, you will have 10 instances of that instance variable as well. But, there will be only one instance of the static or class variable. Instance variables are accessed as follows: objname.variableName; Class variables are accessed as follows: ClassName.variableName;
Instantiation is creating the instance of the variable/object . While Initialization is to provide the variable with some value. int i; // i is an instance of an integer i=10; //initialised with the value 10
Version: static reference to a specific entity of a specific instance. Function: dynamic reference to existing algorithm to perform or execute.
difference between fixed and variable inputs
A constant is something that will ALWAYS remain the same in your experiment. For instance, the materials you use and the unit of measurements you use are examples of constants. An independent variable changes with the experiments.
The difference between a variable resistor and a rheostat is the same as the difference between six and half a dozen.
The difference between a controlled variable and a variable is in their state. A controlled variable is something which is rigid and constant while a variable is liable to change and inconsistent.
difference between constant and static variables in java
The difference between these both is that the control is what stays the same in an experiment and the variable is what changes.
The variable.