// arrays/ComparingArrays.java

// (c)2017 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// Using Arrays.equals()

import java.util.*;

import onjava.*;

public class ComparingArrays {

public static final int SZ = 15;

static String[][] twoDArray() {

String[][] md = new String[5][];

Arrays.setAll(md, n -> new String[n]);

for(int i = 0; i < md.length; i++)

Arrays.setAll(md[i], new Rand.String()::get);

return md;

}

public static void main(String[] args) {

int[] a1 = new int[SZ], a2 = new int[SZ];

Arrays.setAll(a1, new Count.Integer()::get);

Arrays.setAll(a2, new Count.Integer()::get);

System.out.println(

"a1 == a2: " + Arrays.equals(a1, a2));

a2[3] = 11;

System.out.println(

"a1 == a2: " + Arrays.equals(a1, a2));

Integer[] a1w = new Integer[SZ],

a2w = new Integer[SZ];

Arrays.setAll(a1w, new Count.Integer()::get);

Arrays.setAll(a2w, new Count.Integer()::get);

System.out.println(

"a1w == a2w: " + Arrays.equals(a1w, a2w));

a2w[3] = 11;

System.out.println(

"a1w == a2w: " + Arrays.equals(a1w, a2w));

String[][] md1 = twoDArray(), md2 = twoDArray();

System.out.println(Arrays.deepToString(md1));

System.out.println("deepEquals(md1, md2): " +

Arrays.deepEquals(md1, md2));

System.out.println(

"md1 == md2: " + Arrays.equals(md1, md2));

md1[4][1] = "#$#$#$#";

System.out.println(Arrays.deepToString(md1));

System.out.println("deepEquals(md1, md2): " +

Arrays.deepEquals(md1, md2));

}

}

/* Output:

a1 == a2: true

a1 == a2: false

a1w == a2w: true

a1w == a2w: false

[[], [btpenpc], [btpenpc, cuxszgv], [btpenpc, cuxszgv,

gmeinne], [btpenpc, cuxszgv, gmeinne, eloztdv]]

deepEquals(md1, md2): true

md1 == md2: false

[[], [btpenpc], [btpenpc, cuxszgv], [btpenpc, cuxszgv,

gmeinne], [btpenpc, #$#$#$#, gmeinne, eloztdv]]

deepEquals(md1, md2): false

*/