Creating and using a two-dimensional array of 6.3 6.3.3 using two-dimensional arrays

6.3.3 using two-dimensional arrays

1. 3 outputs a write code for row 4 and all matrix elements are zero.

public class Demo {
	public static void main(String[] args) {
		int a[][]=new int[3][4];
		for(int i=0;i<a.length;i++) {
			for(int j=0;j<a[i].length;j++) {
				System.out.print(a[i][j]);
			}
			System.out.println();
		}		
	}
}

 result

Note : After the array is declared as an array elements and complete allocate space for the array elements must be initialized ( initialization is first assigned mean values ) only after the use of array elements. If no initialization of array elements, the array elements also have default values, the default value table array element types shown in FIG.