Unsetting variables

Question

How can I unset any variables in Java such that I can reuse by using different type next time?
For example :
String a = "String"
System.out.print(a);
__________//block of code to unset variable 'a'
int a = 5
System.out.print(a);
I meant just like we use function "unset($variable)" in PHP.
Please answer soon !

Answer 1

you cant, as variable a is assigned to data type String. you can convert a string to int using Interger.parseInt(yourString); but the value of your string would have to be "5" and not "five" also you would have to use a new variable
String str = "5";
int a = Integer.parseInt(str);
System.out.print(a);

Answer 2

I also don't know

Answer 3

Dont

Answer 4

May be easy to do it so?
String strA = "string";
Int intA = Integer.parseInt(strA);
Or you need String a = null;
Start garbage collection, and after try to new a. Idk can be or dont, try...