37 lines
1.1 KiB
Java
37 lines
1.1 KiB
Java
// arrays/ComparatorTest.java
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// Implementing a Comparator for a class.
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import java.util.*;
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import onjava.*;
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class CompTypeComparator implements Comparator<CompType> {
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public int compare(CompType o1, CompType o2) {
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return (o1.j < o2.j ? -1 : (o1.j == o2.j ? 0 : 1));
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}
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}
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public class ComparatorTest {
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public static void main(String[] args) {
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CompType[] a = Generated.array(
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new CompType[12], CompType.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, new CompTypeComparator());
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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 = 68, j = 0], [i = 22, j = 7], [i = 11, j = 22]
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, [i = 88, j = 28], [i = 61, j = 29], [i = 16, j = 40]
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, [i = 58, j = 55], [i = 20, j = 58], [i = 93, j = 61]
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, [i = 98, j = 61], [i = 9, j = 78], [i = 51, j = 89]
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]
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*/
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