java-tutorials/guava21/src/test/java/ComparatorsUnitTests.java

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import com.google.common.collect.Comparators;
import org.junit.Assert;
import org.junit.Test;
import java.util.*;
import java.util.function.Function;
import java.util.function.ToDoubleFunction;
import java.util.function.ToIntFunction;
import java.util.function.ToLongFunction;
public class ComparatorsUnitTests {
@Test
public void isInOrderTest(){
List<Integer> numbers = Arrays.asList(1,2,3,4,4,6,7,8,9,10);
boolean isInAscendingOrder = Comparators.isInOrder(numbers, new AscendingOrderComparator<Number>());
Assert.assertTrue(isInAscendingOrder);
}
@Test
public void isInStrictOrderTest(){
List<Integer> numbers = Arrays.asList(1,2,3,4,3,6,7,8,9,10);
boolean isInAscendingOrder = Comparators.isInOrder(numbers, new AscendingOrderComparator<Number>());
Assert.assertFalse(isInAscendingOrder);
}
private class AscendingOrderComparator<I extends Number> implements Comparator<Integer>{
@Override
public int compare(Integer o1, Integer o2) {
return o1.compareTo(o2);
}
@Override
public Comparator<Integer> reversed() {
return null;
}
@Override
public Comparator<Integer> thenComparing(Comparator<? super Integer> other) {
return null;
}
@Override
public <U> Comparator<Integer> thenComparing(Function<? super Integer, ? extends U> keyExtractor, Comparator<? super U> keyComparator) {
return null;
}
@Override
public <U extends Comparable<? super U>> Comparator<Integer> thenComparing(Function<? super Integer, ? extends U> keyExtractor) {
return null;
}
@Override
public Comparator<Integer> thenComparingInt(ToIntFunction<? super Integer> keyExtractor) {
return null;
}
@Override
public Comparator<Integer> thenComparingLong(ToLongFunction<? super Integer> keyExtractor) {
return null;
}
@Override
public Comparator<Integer> thenComparingDouble(ToDoubleFunction<? super Integer> keyExtractor) {
return null;
}
}
}