Quia
Multiple-Subscripted Arrays
Two dimensional arrays have rows and columns.
Java does not support 2D arrays but does allow the programmer to specify single-subscripted arrays whose elements are single-subscripted arrays.
int num[][]={{5,10},{15,20}};
num[0][0] is 5
num[0][1] is 10
num[1][0] is 15
num[1][1] is 20
The compiler determines the number of rows by counting the number of initializer lists and determines the number of columns by counting the numbert of initialize values.
int matrix[][];
matrix= new int[3][4];
Each row can have a different number of columns.
int notsame [][]={{3,6},{4,8,12}};
Or
int notsame[][];
notsame = new int[2];
notsame[0]= new int[2];
notsame[1]=new int[3];
Use notsame[row].length to traverse the array, where row is the row number(0 or 1).
Look at p344 Fig 7.15
Notice nested for loops
for (int row=0; row ................
................
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