java 泛型类

简介

类似C++模板类

code

package cn;

public class Pair<T> {
	private T first;
	private T second;
	
	public Pair() {
		first = null; 
		second = null;
	}
	
	public Pair(T first, T second){
		this.first = first;
		this.second = second;
	}
	
	public T getFirst(){
		return first;
	}
	public T getSecond() {
		return second;
	}
	
	public void setFirst(T newValue) {
		first = newValue;
	}
	public void setSecond(T newValue) {
		second = newValue;
	}
}

package cn;

import cn.Pair;


class ArrayAlg1{
	/**
	 *  get the min max
	 */
	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 = 1; 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<>(min, max);
	}
}
public class PairTest1 {
	public static void main(String[] args){
		String[] words = {"Mary", "had", "a", "little", "lamb"};
		Pair<String>mm=ArrayAlg1.minmax(words);
		System.out.println("min = " + mm.getFirst());
		System.out.println("max = " + mm.getSecond());
	}
}