Strategy Pattern

Java

by techbard 2016. 7. 20. 19:24

# ICalcStrategy.java

public interface ICalcStrategy {

int calc(Data data);

}

# Data.java

public class Data {
private int x, y;
private ICalcStrategy iCalcStrategy;

public Data(int x, int y, ICalcStrategy iCalcStrategy) {
this.x = x;
this.y = y;
this.iCalcStrategy = iCalcStrategy;
}

public int calc() {
return iCalcStrategy.calc(this);
}

public int getX() {
return this.x;
}

public int getY() {
return this.y;
}
}

# CalcPlus.java

public class CalcPlus implements ICalcStrategy {

@Override
public int calc(Data data) {
return data.getX() + data.getY();
}
}

# CalcMultiply.java

public class CalcMultiply implements ICalcStrategy {

@Override
public int calc(Data data) {
return data.getX() * data.getY();
}
}

# CalcMinus.java

public class CalcMinus implements ICalcStrategy {

@Override
public int calc(Data data) {
return data.getX() - data.getY();
}
}

# Main.java

public class Main {

public static void main(String[] args) {

Data dataPlus = new Data(1, 2, new CalcPlus());
Data dataMultiply = new Data(3, 4, new CalcMultiply());
Data dataMinus = new Data(1, 2, new CalcMinus());

System.out.println(dataPlus.getX() + " plus " +
dataPlus.getY() + " is " + dataPlus.calc());

System.out.println(dataMultiply.getX() + " multiply " +
dataMultiply.getY() + " is " + dataMultiply.calc());

System.out.println(dataMinus.getX() + " minus " +
dataMinus.getY() + " is " + dataMinus.calc());
}
}