public static void main(String[] args) {

Scanner s = new Scanner(System.in);

// single dimensional array.

// int ar[] = new int[5]; //dynamic initialization

int ar[] = { 1, 2, 3, 4, 5 }; // static initialization

// custom array input in loop

// for(int i = 0;i<5;++i){

// System.out.print("ar["+i+"]: ");

// ar[i] = s.nextInt();

// }

System.out.println();

for (int j = 0; j < 5; ++j) {

System.out.println("ar[" + j + "]: " + ar[j]);

}

// multi dimensional array (2D).

System.out.println();

// int [][] arr = new int[3][2]; //dynamic initialization

int arr[][] = { { 1, 2 }, { 3, 4 }, { 5, 6 } }; // static initialization

// custom 2d array input in loop

// for(int k = 0;k<3;++k){

// for(int l = 0; l<2;++l){

// System.out.print("arr["+k+"]["+l+"]: ");

// arr[k][l] = s.nextInt();

// }

// }

System.out.println();

for (int m = 0; m < 3; ++m) {

for (int n = 0; n < 2; ++n) {

// System.out.print("arr["+m+"]["+n+"]: "+arr[m][n]);

System.out.print(arr[m][n] + " ");

}

System.out.println();

}

// jagged array( column size varies for every row).

// int [][] arra = new int [3][];

// arra[0] = new int[2];

// arra[1] = new int[1];

// arra[2] = new int[3];

int arra[][] = { { 1, 2, 3 }, { 2, 4 }, { 1, 2, 4, 5 } }; // static initialization of jagged values

// dynamic input of array values.

// for(int o = 0;o<3;++o){

// for(int p = 0;p<arra[o].length; ++p){

// arra[o][p] = s.nextInt();

// }

// }

System.out.println();

for (int q = 0; q < 3; ++q) {

for (int r = 0; r < arra[q].length; ++r) {

System.out.print(arra[q][r] + " ");

}

System.out.println();

}

s.close();

}

}