63 lines
2.0 KiB
Java
63 lines
2.0 KiB
Java
// arrays/ComparingArrays.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// Using Arrays.equals()
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import java.util.*;
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import onjava.*;
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public class ComparingArrays {
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public static final int SZ = 15;
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static String[][] TwoDArray() {
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String[][] md = new String[5][];
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Arrays.setAll(md, n -> new String[n]);
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for(int i = 0; i < md.length; i++)
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Arrays.setAll(md[i], new Rand.String()::get);
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return md;
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}
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public static void main(String[] args) {
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int[] a1 = new int[SZ], a2 = new int[SZ];
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Arrays.setAll(a1, new Count.Integer()::get);
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Arrays.setAll(a2, new Count.Integer()::get);
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System.out.println(
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"a1 == a2: " + Arrays.equals(a1, a2));
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a2[3] = 11;
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System.out.println(
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"a1 == a2: " + Arrays.equals(a1, a2));
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Integer[] a1w = new Integer[SZ],
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a2w = new Integer[SZ];
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Arrays.setAll(a1w, new Count.Integer()::get);
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Arrays.setAll(a2w, new Count.Integer()::get);
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System.out.println(
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"a1w == a2w: " + Arrays.equals(a1w, a2w));
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a2w[3] = 11;
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System.out.println(
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"a1w == a2w: " + Arrays.equals(a1w, a2w));
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String[][] md1 = TwoDArray(), md2 = TwoDArray();
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System.out.println(Arrays.deepToString(md1));
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System.out.println("deepEquals(md1, md2): " +
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Arrays.deepEquals(md1, md2));
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System.out.println(
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"md1 == md2: " + Arrays.equals(md1, md2));
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md1[4][1] = "#$#$#$#";
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System.out.println(Arrays.deepToString(md1));
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System.out.println("deepEquals(md1, md2): " +
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Arrays.deepEquals(md1, md2));
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}
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}
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/* Output:
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a1 == a2: true
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a1 == a2: false
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a1w == a2w: true
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a1w == a2w: false
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[[], [btpenpc], [btpenpc, cuxszgv], [btpenpc, cuxszgv,
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gmeinne], [btpenpc, cuxszgv, gmeinne, eloztdv]]
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deepEquals(md1, md2): true
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md1 == md2: false
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[[], [btpenpc], [btpenpc, cuxszgv], [btpenpc, cuxszgv,
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gmeinne], [btpenpc, #$#$#$#, gmeinne, eloztdv]]
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deepEquals(md1, md2): false
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*/
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