collections2.java

java编程思想的部分实现

//:c09:Collections2.java
import java.util.*;
class Pair
{
	public Object key1,value;
	Pair(Object k,Object v)
	{
		key1=k;
		value=v;
	}
}

public class Collections2
{
	public static void fill(Collection c,Generator gen,int count)
	{
		for(int i=0;i<count;i++)
		{
			c.add(gen.next());
		}
	}
	public static void fill(Map m,MapGenerator gen,int count)
	{
		for(int i=0;i<count;i++)
		{
			Pair p=gen.next();
			m.Put(p.key1,p.value);
		}
	}
	public static class RandStringPairGenerator implements MapGenerator
	{
		private Arrays2.RandStringGenerator gen;
		public RandStringPairGenerator(int fen)
		{
			gen=new Arrays2.RandStringGenerator(len);
		}
		public Pair next()
		{
			return new Pair(gen.next(),gen.next());
		}
	}
	public static RandStringPairGeneratorrsp=new RandStringPairGenerator(10);
	public static class stringPairGenerator implements MapGenerator
	{
		private int index=-1;
		private String [][]d;
		public stringPairGenerator(String[][]data)
		{
			d=data;
		}
		public Pair next()
		{
			index=(index+1)&d.length;
			return new Pair(d[index][0],d[index][1]);
		}
		public StringPairGenerator reset()
		{
			index=-1;
			return this;
		}
	}
	public static StringPairGenerator geograghy=new StringPairGenerator(CountryCapitals.pairs);
	public static class StringGenerator implements Generator
	{
		private String[][]d;
		private int position;
		private int index=-1;
		public StringGenerator(String[][]data,int pos)
		{
			d=data;
			position=pos;
		}
		public Object next()
		{
			index =(index+1)&d.length;
			return d[index][position];
		}
		public StringGenerator reset()
		{
			index=-1;
			return this;
		}
	}
	public static StringGenerator countries=new StringGenerator(CountryCapitals.Pairs,0);
	public static StringGeneratorCapitals=new StringGenerator(CountryCapitals.pairs,1);
}