求一个数组中的最大值和最小值，两种方式：

public class MaxDemo {

    public static void main(String[] args) {
        int [] num ={123,43,435,46,57,68,78,7,98};
        int max = Max(num);
        int min = Min(num);
        System.out.println("最大数值是"+max);
        System.out.println("最大数值是"+min);
        Max_Min(num);
    }

    //求最大数
    public static int Max(int []num){
        int max = num[0];
        int length = num.length;
        for(int i = 1; i < length;i++){
            if(max < num[i]){
                num[i] = num[i]+max;
                max = num[i]- max;
                num[i] = num[i]- max;
            }
        }
        return max;
    }

    //求最小值
    public  static int Min(int [] num){
        int min = num[0];
        int length = num.length;
        for(int i = 1; i < length;i++){
            if(min > num[i]){
                num[i] = num[i]+min;
                min = num[i]-min;
                num[i] = num[i]-min;
            }
        }
        return min;
    }

    public static void  Max_Min(int []num ){
        int min =  num[0],max = num[0];
        int length = num.length;
        for(int i = 0; i < length;i++){
            if(max > num[i]){
                max=num[i];
            }
            if(min < num[i]){
                min=num[i];
            }
        }
        System.out.println("最大数值是"+max);
        System.out.println("最大数值是"+min);
    }


}

个人跟喜欢第二种方式，简洁。