1、詳細程式碼

import java.util.Scanner;

public class coding3 {
	public static void main(String[] args) {
		System.out.println("輸出行數：");
		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt();

		int arr[][] = getTri(n);
		printTri(arr);

	}


	public static int[][] getTri(int n) {
		int[][] arr = new int[n][n];

		for (int i = 0; i < n; i++) {
			arr[i][0] = arr[i][i] = 1;
		}
		for (int i = 2; i < arr.length; i++) {
			for (int j = 1; j < i; j++) {
				arr[i][j] = arr[i - 1][j] + arr[i - 1][j - 1];
			}
		}
		return arr;
	}

	public static void printTri(int[][] arr) {
		for (int i = 0; i < arr.length; i++) {
			//輸出楊輝三角數字前的空格
			for(int j = 0;j<arr.length-1-i;j++) {
				System.out.print("   ");
			}
			for(int j = 0;j<=i;j++) {
				//列印空格填補空位
				System.out.print("   ");
				System.out.printf("%-3d",arr[i][j]);
			}
			System.out.println();
		}
	}

}
 

2、輸出效果