import java.io.*; class myvar{ private float x; myvar(float a) {this.x = a;} float get() { return this.x; } void set(float a) {this.x = a;} } class myswap{ static void swap(myvar a, myvar b) { float t = a.get(); a.set(b.get()); b.set(t); } public static void main(String argv[]) { myvar aa=new myvar(47.1f); myvar bb=new myvar(13.2f); System.out.println("Prima:a="+aa.get()+" b="+bb.get()); swap(aa,bb); System.out.println("Dopo:a="+aa.get()+" b="+bb.get()); } }