Java Beginner (iv)

Diagram of two-dimensional array

Second, plot dynamic creation of two-dimensional arrays

Three, Yang Hui triangle exercises:

1 ImportJava.util.Scanner;2 classarray2demo{3     //Realizing the Yang Hui Triangle4      Public Static voidMain (string[] args) {5         //Creating a Keyboard entry object6Scanner sc=NewScanner (system.in);7System.out.println ("Please enter data:");8         intn=sc.nextint ();9         Ten         //defining a two-dimensional array One         int[] arr=New int[n][n]; A         //assign a value of 1 to the first and last column of each row of this two-dimensional array -          for(intx=0;x<arr.length;x++){ -Arr[x][0]=1;//first column per row theArr[x][x]=1;//last column of each row -         } -         //rule: Starting with the third row, the value of each element is the sum of the previous column and the value of the column in the previous row -          for(intx=2;x<arr.length;x++){ +             //because the first and last columns in each row are assigned a value of 1, you should traverse the column by 1 minus -              for(inty=1;y<=x-1;y++){ +                 //Assign values by law AArr[x][y]=arr[x-1][y-1]+arr[x-1][y]; at             } -         } -         //Print Output -          for(inti=0;i<arr.length;i++){ -              for(intj=0;j<=i;j++){ - System.out.print (Arr[i][j]); in             } - System.out.println (); to         } +     } -}

Java Beginner (iv)