简单算法1

public static void main(String[] args) {
		int a[] = new int[]{2,4,6,8,3};
		Arrays.sort(a); //2 3 4 6 8
		int b = 12;
		int j = a.length - 1;
		for (int i = 0; i <= j; ) {
			if (a[i] == b) {
				System.out.println(a[i]);
				break;
			}
			if (a[j-1] == b) {
				System.out.println(a[j-1]);
				break;
			}
			if (a[i] + a[j] == b) {
				System.out.println(a[i]+"和"+a[j]);
				break;
			}
			if (a[i]+a[j] < b) {
				i++;
				continue;
			}
			if (a[i]+a[j] > b) {
				j--;
				continue;
			}
			
		}		    
}