java中如何使用泛型方法比较大小

package demo.com.fanxing;
 
public class Num<T> {
	//定义最大最小值
	public T max;
	public T min;
	//构造函数(无参)
	public Num() {
		super();
	}
	//构造函数(有参)
	public Num(T max, T min) {
		super();
		this.max = max;
		this.min = min;
	}
 
	public T getMax() {
		return max;
	}
	public void setMax(T max) {
		this.max = max;
	}
	public T getMin() {
		return min;
	}
	public void setMin(T min) {
		this.min = min;
	}
	 /**
	  * 重写输出字符串
	  */
	@Override
	public String toString() {
		return "Num [max=" + max + ", min=" + min + "]";
	}
	
}

package demo.com.fanxing;
 
public class Compare {
 
	/**
	 * 比较最大最小值的泛型方法
	 * @param num
	 * @return
	 */
	 //这里必须在public和返回值类型中加入泛型去继承Comparable，不然不好比较
	public <T extends Comparable<T>> Num<T> getMaxMin(T[] num){
		T max = num[0];
		T min = num[0];
		//遍历数组，比较出最大最小值
		for (int i = 0; i < num.length; i++) {
			if (max.compareTo(num[i]) < 0) {
				max = num[i];
			}
			if (min.compareTo(num[i]) > 0) {
				min = num[i];
			}
		}
		//返回的是Num泛型类的带参构造的对象
		return new Num<T>(max,min);
	}
}

package demo.com.fanxing;
 
public class TestWork extends Num {
 
	public static void main(String[] args) {
		Compare compare=new Compare();
		//整型数组比较
		Integer[] num ={22,2,99,9,5,6};
		System.out.println("=======整型数组比较=======");
		System.out.println((compare.getMaxMin(num))); 
		//字符串数组比较
		String[] str = new String[] {"aas","sadx","werd","111"};
		System.out.println("=======字符串数组比较=======");
		System.out.println((compare.getMaxMin(str)));
		//Double数组比较
		Double[] dou = new Double[] {1.1,2.2,3.3,66.66,8.0};
		System.out.println("=======Double数组比较=======");
		System.out.println((compare.getMaxMin(dou)));
 
	}
}