Decorator + Composite Pattern

Java

by techbard 2016. 7. 21. 21:03

# ISummable.java

public interface ISummable {
int getSumUp();
void setNumber(int number);
}

# Zero.java

public class Zero implements ISummable {

@Override
public int getSumUp() {
return 0;
}

@Override
public void setNumber(int number) {

}
}

# Number.java

public class Number implements ISummable {
ISummable mSummable;
private int number;

public Number(ISummable summable) {
this.mSummable = summable;
}

@Override
public void setNumber(int number) {
this.number = number;
}

@Override
public int getSumUp() {
return this.number + mSummable.getSumUp();
}
}

# Main.java

public class Main {

public static void main(String[] args) {
ISummable c = new Zero();

c = new Number(c);
c.setNumber(1);

c = new Number(c);
c.setNumber(2);

c = new Number(c);
c.setNumber(-2);

System.out.println(c.getSumUp());
}
}