{For java learners} Different kinds of Variables {For java learners}

Question

Somebody could explain it,

class Point {
static int numPoints; // numPoints is a class variable
int x, y; // x and y are instance variables
int[] w = new int[10]; // w[0] is an array component
int setX(int x) { // x is a method parameter
int oldx = this.x; // oldx is a local variable
this.x = x;
return oldx;
}
}

Answer 1

local variable oldx is using and existing only inside method setX. more here: http://javabeginnerstutorial.com/core-java-tutorial/local-variable-in-java/
intance variables (fields) are used by Objects to store their states. It's existing inside our class and can be used by all class' methods. more here: http://javabeginnerstutorial.com/core-java-tutorial/instance-variable-in-java/
class variable: http://javabeginnerstutorial.com/core-java-tutorial/java-static-keyword/

i hope it helps

Answer 2

@Katarzyna thanks, but that code was example to demonstrate different types of variable that are in java. And I said somebody could explain, about local variable, class variable, instance variable.

Again thank you for taking your time.

Answer 3

You are awesome @Ram Sir

Answer 4

@Ram chandra Giri, i have tested your code and i think i know why it doesn't work. your method should look like this:
static int setX(int x){
return x;
}

Answer 5

maan these clever ppl... i dont understand a word ur saying. prob cuz im 13