?? detergentdelegation.java
字號:
// reusing/DetergentDelegation.java
// TIJ4 Chapter Reusing, Exercise 11, page 248
// Modify Detergent.java so that is uses delegation.
import static net.mindview.util.Print.*;
class Cleanser {
private String s = "Cleanser";
public void append(String a) { s += a; }
public void dilute() { append(" dilute()"); }
public void apply() { append(" apply()"); }
public void scrub() { append(" scrub()"); }
public String toString() { return s; }
public static void main(String[] args) {
Cleanser x = new Cleanser();
print(x);
}
}
public class DetergentDelegation {
private String s = "DetergentDelegation";
Cleanser c = new Cleanser();
public void append(String a) { s += a; }
// two methods delegated entirely to Cleanser c:
public void dilute() {
c.dilute();
}
public void apply() {
c.apply();
}
// method delegated in part to Cleanser c:
public void scrub() {
append(" DetergentDelegation.scrub()");
c.scrub();
}
public void foam() { append(" foam()"); }
public String toString() { return s + " " + c; }
public static void main(String[] args) {
DetergentDelegation x = new DetergentDelegation();
x.dilute();
x.apply();
x.scrub();
x.foam();
print(x);
print("Testing base class:");
Cleanser.main(args);
}
}
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