How to use a variable from one method to another

Question

for example if a have a var x in method 1 and how can i use that variable to another method 2?

Answer 1

public void method2(int var) {
var += 4;
}

public void method1() {
int x = 4;
method2(x);
}

Answer 2

If any variable is created inside a function, it will be destroyed when the function ends, so there is no way to do that.