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Home >Java > Classi metodi costruttori esempio pratico .. punti di un piano euclideo
// Compila i 2 file Punti.java e chiamataClassePunti.java // lancia chiamataClassePunti (D:\j2sdk1.4.2\bin>java chiamataClassePunti ) // file Punti.java // Credits to John R. Hubbard "Data Structures with Java" The McGraw-Hill Companies, Inc. // Le istanze della classe Punti // rappresentano i punti del piano Euclideo public class Punti { protected double x,y; public Punti (double x, double y) { this.x = x; this.y = y; } // metodo public double getX() { return x; } // metodo public double getY() { return y; } // metodo public Punti getLocation() { return new Punti(x,y); } // metodo di modifica public void setLocation(double x, double y) { this.x = x; this.y = y; } public void translate(double dx, double dy) { x +=dx; y +=dy; } public boolean equals(Object object) { if (object == this) return true; if (object.getClass() != this.getClass()) return false; Punti punti = (Punti)object; return (x == punti.x && y == punti.y); } // metodo public int hashCode() { return(new Double(x)).hashCode() + (new Double(y)).hashCode(); } // metodo public String toString() { return new String("(" + (float)x + "," + (float)y + ")"); } } //************************************************************ //file chiamataClassePunti.java public class chiamataClassePunti { public static void main(String[] args) { // Chiamata alla classe Punti Punti p = new Punti(20,30); System.out.println("p= " + p); System.out.println("p.hashCode()= " + p.hashCode()); Punti q = p.getLocation(); compare(p,q); q.translate(5,-1); compare(p,q); q=p; compare(p,q); } private static void compare(Punti p, Punti q) { System.out.println("q = " + q); System.out.println("q.hashCode() = " + q.hashCode()); if (q.equals(p)) System.out.println("q è uguale a p"); else System.out.println(" q non è uguale a p"); if (q ==p) System.out.println(" q==p"); else System.out.println(" q != p"); } } Warning: include(ads/text468x15.html): failed to open stream: No such file or directory in D:\inetpub\webs\fishscriptcom\documents\view_document.php on line 131 Warning: include(): Failed opening 'ads/text468x15.html' for inclusion (include_path='.;C:\php\pear') in D:\inetpub\webs\fishscriptcom\documents\view_document.php on line 131 Tutorial ![]() ![]() ![]() ![]() ![]() ![]() ![]() Script ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Comandi ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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A good scientist is a person with original ideas.
A good engineer is a person who makes a design that works with as few original ideas as possible. There are no prima donnas in engineering. Freeman Dyson A good scientist is a person with original ideas.
A good engineer is a person who makes a design that works with as few original ideas as possible. There are no prima donnas in engineering. Freeman Dyson
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