int[][] aMatrix = new int[4][];
//populate matrix
for (int i = 0; i < aMatrix.length; i++) {
aMatrix[i] = new int[5]; //create sub-array
for (int j = 0; j < aMatrix[i].length; j++) {
aMatrix[i][j] = i + j;
}
}
//print matrix
for (int i = 0; i < aMatrix.length; i++) {
for (int j = 0; j < aMatrix[i].length; j++) {
System.out.print(aMatrix[i][j] + " ");
}
System.out.println();
}
