Imam i ja jedan problem...da li iko moze pomoci oko resavanja sledeceg>
1. Klase A, B, C, D, E, F, M1 su u paketu P1, i svaka klasa je napisana u posebnom fajl.
a) Otkriti greške u definicijama klasa A, B, C, D, E, F i navesti vrstu greške.
abstract public class A {
int x;
char c;
public A() {x=1;}
public A(char b){super(); c=b;}
abstract public boolean m1();
abstract public int m2(int y);}
}
public class B extends A {
protected String s;
static int n=0;
private int id;
public B(B b) {s=b.s; id=n++;}
B(String h){s=h;super('b');id=n++;}
public boolean m1(){return n>5;}
public int m2(int y){return y*id;}
public static int m3(){return id;}
}
public class C extends B {
private double r;
public C() {}
public C(double r) {this.r=r;}
public C(C o) {super(o);r=o.r;}
final public int m2(int y)
{return (int)(r*y);}
double m4(){return c;}
}
public class D extends C {
public boolean m;
double r;
public D() {}
D(C o) {super(o);m=true;}
public D(boolean t) {super();m=t;}
public int m2(int y)
{return y +(int)r;}
double m4(){return super.r;}
}
public class E extends C {
private String m;
public E() {m="klasaE";}
E(String m,C c){super(m);this.m=m;}
public E(String h) {m=h;}
public void m5(String h){m=h;}
public double m5(int m){return m*x;}
E m5(){return new E("E", this);}
}
public class F extends A {
private double r,p,h;
public F() {}
F(double m,char n){super(n);r=p=h=m;}
public boolean m1(){return r<p;}
public int m3(int y){return y*r;}}
b) U telima metoda main klasa M1 i M2 obeležiti sve ispravne linije koda znakom “+”, a neispravne znakom “–”. Smatrati da su klase A, B, C, D, E, F
ispravno napisane i da svi članovi ovih klasa koji se koriste u M1 i M2 imaju specifikatore pristupa i tipove koji su navedeni.
// Sadržaj fajla M1.java
package P1;
class M1 {
public static void main(String a[]){
A a1 = new A('a');
A a2 = new B("ispit");
A a3 = new C();
B b1 = new C();
B b2 = new B(b1);
C c1 = new E("ispit");
C c2 = new C(a1);
C c3 = new D(c1);
A a4 = new D(b2);
B b3 = new E("i", c1);
D d1 = new E();
D d2 = new C();
D d3 = new D(false);
E e1 = new E('t');
E e2 = new F(1, 'a');
E e3 = c3;
E e4 = new E("ispit", d1);
E e5 = e4.m5();
F f1 = e5.m5();
F f2 = c3;
F f3 = new F(a1.x,a1.c);
B b4 = new D(f3.m1());
E e6 = new E(e5.m);
double f = c3.r;
e5.m5("ispit");
double t = B.m3();
String y = B.n;
double u = d1.r + d1.x;
char g = e5.c;
}
}
// Sadržaj fajla M2.java
package P2;
import P1.*;
class M2 {
public static void main(String a[]){
A a1 = new F();
B b1 = new D(true);
C c1 = new C();
D d1 = new D(c1);
E e1 = new E("",c1);
E e2 = e1.m5();
String g = b1.s;
F f1 = new F(2,'b');
int u = B.n;
boolean m = d1.m;}
}