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| interface Strategy {
int doOperation(int num1, int num2);
}
class OperationAdd implements Strategy {
@Override
public int doOperation(int num1, int num2) {
return num1 + num2;
}
}
class OperationSubtract implements Strategy {
@Override
public int doOperation(int num1, int num2) {
return num1 - num2;
}
}
class OperationMultiply implements Strategy {
@Override
public int doOperation(int num1, int num2) {
return num1 * num2;
}
}
class Context {
Strategy strategy;
public Context(Strategy strategy) {
this.strategy = strategy;
}
public int executeStrategy(int num1, int num2) {
return strategy.doOperation(num1, num2);
}
}
public class StrategyPatternDemo {
public static void main(String[] args) {
Context context = new Context(new OperationAdd());
System.out.println("10 + 5 = " + context.executeStrategy(10, 5));
context = new Context(new OperationSubtract());
System.out.println("10 - 5 = " + context.executeStrategy(10, 5));
context = new Context(new OperationMultiply());
System.out.println("10 * 5 = " + context.executeStrategy(10, 5));
}
}
|