42 lines
973 B
Java
42 lines
973 B
Java
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import java.util.*;
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public class Pair<U extends Comparable<U>, V extends Comparable<V>> implements Comparable<Pair<U, V>> {
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final U u;
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final V v;
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public Pair(U u, V v) {
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this.u = u;
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this.v = v;
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}
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public int hashCode() {
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return (u == null ? 0 : u.hashCode() * 31) + (v == null ? 0 : v.hashCode());
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}
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public boolean equals(Object o) {
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if (this == o)
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return true;
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if (o == null || getClass() != o.getClass())
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return false;
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Pair<U, V> p = (Pair<U, V>) o;
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return (u == null ? p.u == null : u.equals(p.u)) && (v == null ? p.v == null : v.equals(p.v));
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}
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public int compareTo(Pair<U, V> b) {
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int cmpU = u.compareTo(b.u);
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return cmpU != 0 ? cmpU : v.compareTo(b.v);
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}
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// Usage example
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public static void main(String[] args) {
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Pair<Integer, Integer>[] a = new Pair[10];
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for (int i = 0; i < a.length; i++) {
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a[i] = new Pair(a.length - i, i);
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}
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Arrays.sort(a);
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for (Pair p : a) {
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System.out.println(p.u + " " + p.v);
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}
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}
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}
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