适配器模式

Adapter.java

import static com.mceiba.util.Print.*;
import java.util.*;

class Filter{
	public String name(){
		return getClass().getSimpleName();
	}
	public Wavaform process(Wavaform input) { return input; }
}
class FilterAdapter implements Processor{
	Filter filter;
	public FilterAdapter(Filter filter) { this.filter = filter; }
	public String name(){ return filter.name(); }
	public Wavaform process(Object input){
		return filter.process((Wavaform)input);
	}
}
public class Adapter{
	public static void main(String[] args){
		Strategy.process(new FilterAdapter(new LowPass(1.0)), new Wavaform());
		Strategy.process(new FilterAdapter(new HighPass(2.0)), new Wavaform());
		Strategy.process(new FilterAdapter(new BandPass(3.0, 4.0)), new Wavaform());
	}
}

class Wavaform{
	private static long counter;
	private final long id = counter++;
	public String toString() { return "Wavaform "+id; }
}
class LowPass extends Filter{
	double cutoff;
	public LowPass(double cutoff) { this.cutoff = cutoff; }
	public Wavaform process(Wavaform input) { return input; }
}
class HighPass extends Filter{
	double cutoff;
	public HighPass(double cutoff) { this.cutoff = cutoff; }
	public Wavaform process(Wavaform input) { return input; }
}
class BandPass extends Filter{
	double lowCutoff, highCutoff;
	public BandPass(double lowCutoff, double highCutoff){
		this.lowCutoff = lowCutoff;
		this.highCutoff = highCutoff;
	}
	public Wavaform process(Wavaform input) { return input; }
}