How do you declare variables during run-time in java?

Answer 1

by the use of constructor . we can initialize the variables in java.The name of the constructor should be same as the name of the class .

Answer 2

Assuming you mean declaring a variable dynamically the way you can do with a JavaScript or Ruby eval(), it's not really possible - Java explicitly disallows eval, macros and other constructs that would let you do so.

If you just want some more key/value bindings, you could use a Map, Map keys can be generated at runtime.

Answer 3

"Initializing" in Java or any other program for that matter is the process of setting a variable to a certain value.

Example:

int x; //Declaration

x = 5; //Initialization

String myString; //Declaration

myString = new String("Hello java initializing"); //Initialization

Answer 4

With the assignment, i.e., the equal sign. The variable has to be declared first. Declaration and assignment can be separate:

int x;
...
x = 5;

Or they can be combined:

int x = 5;

Answer 5

by the use of constructor . we can initialize the variables in java.The name of the constructor should be same as the name of the class .