Stream常用操作min，reduce

        /**
	 * min方法
	 * 用途：取出數據中最小值
	 */
	public static void minEG() {
		List<Integer> nums = Arrays.asList(1, 23, -45, 7, 9);
		Integer min = nums.stream()
				      .min(Comparator.comparing(num -> num))
				      .get();
		
		System.out.println("java8 result:" + min);		 
		// java8 result:-45
		
		Integer target = nums.get(0);
		for (Integer num : nums) {
			if (num < target) {
				target = num;
			}
		}
		System.out.println("java56 result:" + target);		 
		// java56 result:-45
	}
	
	/**
	 * reduce方法
	 * 用途：從一組值中生成一個值
	 */
	public static void reduceEG() {
		List<Integer> nums = Arrays.asList(1,2,3,4,5,6,7,8,9);
		Integer sum = nums.stream()
				  .reduce(0, (acc, element) -> acc + element)
				  .intValue();
		System.out.println("java8 result:" + sum);	
		// java8 result:45
	}