// Tacka.java - Definicija klase tacaka (Tacka).
class Tacka {
private double x, y;
public Tacka () { x = y = 0; }
public Tacka (double xx) { x = xx; y = 0; }
public Tacka (double xx, double yy) { x = xx; y = yy; }
public Tacka (Tacka t) { x = t.x; y = t.y; }
public double aps () { return x; }
public double ord () { return y; }
public void citaj ()
{ x = Usluge.citajDouble (); y = Usluge.citajDouble (); }
public String toString () { return "(" + x + "," + y + ")"; }
public static final Tacka ORG = new Tacka ();
}// Figura.java - Definicija apstraktne klase figura (Figura).
abstract class Figura {
protected Tacka T;
public Figura () { this.T = new Tacka () ; }
public Figura (Tacka T) { this.T = new Tacka (T); }
public void postavi (double xx, double yy) { T = new Tacka(xx, yy); }
public void pomeri (double dx, double dy)
{ T = new Tacka (T.aps()+dx, T.ord()+dx); }
public abstract Figura kopija ();
public abstract double O ();
public abstract double P ();
public abstract void citaj ();
public abstract String toString ();
}// Krug.java - Definicija klase krugova (Krug).
class Krug extends Figura {
private static final double PI = 3.14159265359;
double r;
public Krug () { super () ; r = 1 ; }
public Krug (double rr) { super () ; r = rr; }
public Krug (double rr, Tacka tt) { super (tt); r = rr; }
public Figura kopija () { return new Krug (r, T); }
public double O () { return 2 * r * PI; }
public double P () { return r * r * PI; }
public void citaj () { T.citaj (); r = Usluge.citajDouble (); }
public String toString () { return "krug [T=" + T + ", r=" + r +
", O=" + O() + ", P=" + P() + "]"; }
}// Kvadrat.java - Definicija klase kvadrata (Kvadrat).
class Kvadrat extends Figura {
double a;
public Kvadrat () { super () ; a = 1 ; }
public Kvadrat (double aa) { super () ; a = aa; }
public Kvadrat (double aa, Tacka tt) { super (tt); a = aa; }
public Figura kopija () { return new Kvadrat (a, T); }
public double O () { return 4 * a; }
public double P () { return a * a; }
public void citaj () { T.citaj (); a = Usluge.citajDouble (); }
public String toString () { return "kvadr[T=" + T + ", a=" + a +
", O=" + O() + ", P=" + P() + "]"; }
}// Trougao.java - Definicija klase kvadrata (Trougao).
class Trougao extends Figura {
double a, b, c;
public Trougao () { super () ; a = b = c = 1 ;}
public Trougao (double aa) { super () ; a = b = c = aa;}
public Trougao (double aa, Tacka tt) { super (tt); a = b = c = aa;}
public Trougao (double aa, double bb)
{ super () ; a = aa; b = c = bb; }
public Trougao (double aa, double bb, Tacka tt)
{ super (tt); a = aa; b = c= bb; }
public Trougao (double aa, double bb, double cc)
{ super () ; a = aa; b = bb; c = cc; }
public Trougao (double aa, double bb, double cc, Tacka tt)
{ super (tt); a = aa; b = bb; c = cc; }
public Figura kopija () { return new Trougao (a, b, c, T); }
public double O () { return a + b + c; }
public double P () {
double s = (a + b + c) / 2;
return Math.sqrt (s * (s-a) * (s-b) * (s-c));
}
public void citaj () { T.citaj (); a = Usluge.citajDouble ();
b = Usluge.citajDouble (); c = Usluge.citajDouble ();
}
public String toString () { return "troug[T=" + T + ", a=" + a +
", b=" + b + ", c=" + c + ", O=" + O() + ", P=" + P() + "]"; }
}// Figuret.java - Ispitivanje klasa za geometrijske figure.
class Elem {
Figura fig; Elem nar;
Elem (Figura f) { fig = f.kopija (); nar = null; }
Elem (Figura f, Elem n) { fig = f.kopija (); nar = n; }
}
class Figuret {
public static void main (String[] argi) {
Elem prvi=null, posl=null; Figura fig = null;
for (boolean dalje=true; dalje; ) {
System.out.print ("Figura? ");
char ff = (char)Usluge.citajString (). getBytes ()[0];
switch (ff) {
case 'o': fig = new Krug (); break;
case 'k': fig = new Kvadrat (); break;
case 't': fig = new Trougao (); break;
default : dalje = false;
}
if (! dalje) break;
fig.citaj (); Elem novi = new Elem (fig);
if (posl != null) posl.nar = novi; else prvi = novi;
posl = novi;
}
for (Elem tek=prvi; tek!=null; tek=tek.nar)
System.out.println (tek.fig);
}
}Figura? o 0 0 10
Figura? k 1 1 3
Figura? t 7 2 3 4 5
Figura? t 1 9 1 1 1
Figura? k -2 -4 33
Figura? o -1 0 2.5
Figura? t 7 -2 3 5 5
Figura? x
krug [T=(0.0,0.0), r=10.0, O=62.8318530718, P=314.159265359]
kvadr[T=(1.0,1.0), a=3.0, O=12.0, P=9.0]
troug[T=(7.0,2.0), a=3.0, b=4.0, c=5.0, O=12.0, P=6.0]
troug[T=(1.0,9.0), a=1.0, b=1.0, c=1.0, O=3.0, P=0.4330127018922193]
kvadr[T=(-2.0,-4.0), a=33.0, O=132.0, P=1089.0]
krug [T=(-1.0,0.0), r=2.5, O=15.70796326795, P=19.6349540849375]
troug[T=(7.0,-2.0), a=3.0, b=5.0, c=5.0, O=13.0, P=7.1545440106270926]
Copyright © 1998, Laslo Kraus
Poslednja revizija: 13.6.1998.