norangebit-unisannio-computer-science/programmazione-java
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add abstract class

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This commit is contained in:
orange 2016-12-30 14:57:37 +01:00
parent 0013669ec2
commit f211d00400
2 changed files with 6 additions and 7 deletions
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7
src/Museo/Archivio.java
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@ -33,12 +33,7 @@ public class Archivio{
public void print(PrintStream ps){ public void print(PrintStream ps){
for(Opera o: archivio){ for(Opera o: archivio){
if(o instanceof Libro) o.print(ps);
((Libro) o).print(ps);
if(o instanceof Stampa)
((Stampa) o).print(ps);
if(o instanceof OperaMult)
((OperaMult) o).print(ps);
} }
} }

6
src/Museo/Opera.java
View File

@ -1,4 +1,6 @@
public class Opera{ import java.io.PrintStream;
abstract public class Opera{
public Opera(String autore, String titolo, int anno, String pos){ public Opera(String autore, String titolo, int anno, String pos){
this.anno=anno; this.anno=anno;
this.autore=autore; this.autore=autore;
@ -26,6 +28,8 @@ public class Opera{
return autore.hashCode()*titolo.hashCode()*pos.hashCode()*anno; return autore.hashCode()*titolo.hashCode()*pos.hashCode()*anno;
} }
abstract public void print(PrintStream ps);
protected int anno; protected int anno;
protected String autore; protected String autore;
protected String titolo; protected String titolo;