// DrJava saved history v2
int[] x = new int[7]; 
int[][] = new int[3][4];
int[][] a = new int[3][4]; // 2D array with 3 rows, 4 columns

// A 2D array is an "array of arrays".
a[0][0] = 1;
a[0][1] = 2;
a.length // the number of rows in the array
a[0].length 
a[1].length
a[2].length
int[][] b = new int[2][];
b[0]
b[0] = new int[4];
b[1] = new int[3];