两个javaSE 高频面试题

按如下规则输出10行：

                  1 		
          	  4   2	4 		
            9  6  3	6	9 	
   16	 12   8   4	8	12	16 
25 	20  15   10   5	10	15	20	25

public class Test {
	
public static void main(String[] args) {
		 int num = 4;
		 for (int i = 1; i <= num; i++) { 
		 format(num ,i);
		 write(i);
		 }
	}
	public static void write(int i) {	
		for(int k =i ;k>0 ; k--){
			System.out.print(k*i + " ");
		}
			for(int m=1;m<i;m++){
		
			System.out.print((m+1)*i+ " ");
		}
		
		System.out.println();
	}

	public static void format(int num, int i) {
		for (int k = 2 * (num - i); k >= 0; k--)
			System.out.print(" ");
	}
	
}

打印如下四边型：
输入一个数字:9
80 48 28 16 9 1
32 20 12 7 3 4
12 8 5 5 8 12
4 3 7 12 20 32
1 9 16 28 48 80

public class Test2 {
	    public static void main(String[] args) {
	    	System.out.println("请输入一个数字");
	        while (true) {
	            Scanner scanner = new Scanner(System.in);
	            int num = 0;	 
	            if (scanner.hasNextInt()) {
	            	num = Integer.parseInt(scanner.next());
	             }
	            num = num / 2 + 1;

	            int[][] right = new int[num][num];
	            //
	            //1
	            //3	 4
	            //5	 8	12
	            //7	 12 20  32
	            for (int i = 1; i <= num; i++) {
	                for (int j = 1; j <= i; j++) {
	                    if (j == 1) {
	                    	right[i - 1][j - 1] = 2 * i - 1;
	                    } else {
	                    	right[i - 1][j - 1] = right[i - 2][j - 2] + right[i - 1][j - 2];
	                    }
	                }
	            }
	            //
	            //  7 	12 	20	32
	            //    	12 	8 	5
	            //	    	4   3
	            //		   		1
	            int[][] left = new int[num][num];
	            for (int i = 0; i < num; i++) {
	                for (int j = 0; j < num; j++) {
	                	left[num - i - 1][num - j - 1] = right[i][j];
	                }
	            }
	            for (int i = 1; i <= num; i++) {
	                System.out.println();
	                for (int j = 1; j <= num; j++) {
	                    if (left[i - 1][j - 1] != 0) {
	                        System.out.print(left[i - 1][j - 1] + "\t");
	                    } else {
	                        System.out.print("\t");
	                    }
	                }
	                for (int j = 1; j <= i; j++) {
	                    System.out.print(right[i - 1][j - 1] + "\t");
	                }
	             
	            }
	        }
	    }
	}