58 lines
1.7 KiB
Java
58 lines
1.7 KiB
Java
// arrays/CompType.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://mindviewinc.com/Books/OnJava/ for more book information.
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// Implementing Comparable in a class.
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import java.util.*;
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import java.util.function.*;
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import onjava.*;
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public class CompType implements Comparable<CompType> {
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int i;
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int j;
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private static int count = 1;
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public CompType(int n1, int n2) {
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i = n1;
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j = n2;
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}
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@Override
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public String toString() {
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String result = "[i = " + i + ", j = " + j + "]";
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if(count++ % 3 == 0)
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result += "\n";
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return result;
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}
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@Override
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public int compareTo(CompType rv) {
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return (i < rv.i ? -1 : (i == rv.i ? 0 : 1));
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}
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private static Random r = new Random(47);
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public static Supplier<CompType> generator() {
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return () ->
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new CompType(r.nextInt(100), r.nextInt(100));
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}
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public static void main(String[] args) {
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CompType[] a =
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Generated.array(new CompType[12], generator());
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System.out.println("before sorting:");
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System.out.println(Arrays.toString(a));
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Arrays.sort(a);
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System.out.println("after sorting:");
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System.out.println(Arrays.toString(a));
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}
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}
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/* Output:
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before sorting:
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[[i = 58, j = 55], [i = 93, j = 61], [i = 61, j = 29]
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, [i = 68, j = 0], [i = 22, j = 7], [i = 88, j = 28]
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, [i = 51, j = 89], [i = 9, j = 78], [i = 98, j = 61]
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, [i = 20, j = 58], [i = 16, j = 40], [i = 11, j = 22]
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]
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after sorting:
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[[i = 9, j = 78], [i = 11, j = 22], [i = 16, j = 40]
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, [i = 20, j = 58], [i = 22, j = 7], [i = 51, j = 89]
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, [i = 58, j = 55], [i = 61, j = 29], [i = 68, j = 0]
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, [i = 88, j = 28], [i = 93, j = 61], [i = 98, j = 61]
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]
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*/
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