pairtest1.java

java里的泛型程序设计

public class PairTest1 {
	public static void main(String[] args)
	{
		String[] words={"sfs","had","a","little","lamb"};
		Pair<String> mm=ArrayAlg.minmax(words);
		System.out.println("min="+mm.getFirst());
		System.out.println("max="+mm.getSecond());
		String middle=ArrayAlg.<String>getMiddle(words);
		System.out.println(middle);
	}
}
class ArrayAlg
{
	public static Pair<String> minmax(String[] a){
		if(a==null||a.length==0)return null;
		String min=a[0];
		String max=a[0];
		for(int i=0;i<a.length;i++)
		{
			if(min.compareTo(a[i])>0)min=a[i];
			if(max.compareTo(a[i])<0)max=a[i];
		}
		return new Pair<String>(min,max);
	}
	public static <T> T getMiddle(T[]a)
	{
		return a[a.length/2];
	}
}