public class Over {
public int stack(int j, int k) {  return j + k; }
public int stack(int m) {
return m * m;
}
public int stack(float f) {
return (int)f * 5;
}
public static void main(String args[]) {
int n = 3;
float f = 3;
Over o = new Over();
System.out.println("" + o.stack(n, n));
System.out.println("" + o.stack(n));
System.out.println("" + o.stack(f));
}
}
what is Over o = new Over () do? What is happen if we don't use it?

Class definition:
[CODE=Java]
public class Over {
public int stack(int j, int k) {  return j + k; }
public int stack(int m) {
return m * m;
}
public int stack(float f) {
return (int)f * 5;
}
public static void main(String args[]) {
int n = 3;
float f = 3;
Over o = new Over();
System.out.println("" + o.stack(n, n));
System.out.println("" + o.stack(n));
System.out.println("" + o.stack(f));
}
}[/CODE]

This code
[CODE=Java]Over o = new Over();[/CODE]
Instantiates (creates in the heap of memory) an object of the class Over.