JAVA 如何搞定方法传任意参

Question

int max(int[] data,int len)
{
int result=-1;
for(int i=0;i {
if(i==0)
{
result=0;
}
else
{
if(data[i]>data[result])
r=i;
}
}
}

有没有办法用一个max搞定所有的数据类型呢？（用Java语言）

Answer 1

或者加上泛型的通配符的话……
[code="java"]import java.util.*;

public class Util {
public static T max(Iterable<? extends T> items, Comparator<? super T> comparator) {
T maxItem = null;
for (T obj : items) {
if (null == maxItem || 0 < comparator.compare(obj, maxItem)) {
maxItem = obj;
}
}
return maxItem;
}

public static <T> T max(T[] items, Comparator<? super T> comparator) {
    T maxItem = null;
    for (T obj : items) {
        if (null == maxItem || 0 < comparator.compare(obj, maxItem)) {
            maxItem = obj;
        }
    }
    return maxItem;
}

public static void main(String[] args) {
    Comparator<Integer> comp = new Comparator<Integer>() {
        public int compare(Integer x, Integer y) {
            return x - y;
        }

        public boolean equals(Object obj) {
            return obj.getClass() == this.getClass();
        }
    };

    Integer[] array = new Integer[] { 2, 1, 4, 0, 3 };
    int maxOfArray = max(array, comp);
    System.out.println(maxOfArray); // 4

    Iterable<Integer> list = Arrays.asList(1, 3, 2, -1, 5, 0);
    int maxOfList = max(list, comp);
    System.out.println(maxOfList); // 5
}

}[/code]