本文整理汇总了Java中java.util.OptionalDouble类的典型用法代码示例。如果您正苦于以下问题:Java OptionalDouble类的具体用法?Java OptionalDouble怎么用?Java OptionalDouble使用的例子?那么, 这里精选的类代码示例或许可以为您提供帮助。
OptionalDouble类属于java.util包,在下文中一共展示了OptionalDouble类的15个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: equals
import java.util.OptionalDouble; //导入依赖的package包/类
@Test
public void equals() {
ImmutableJdkOptionals o1 = ImmutableJdkOptionals.of()
.withV2("v2")
.withI1(1)
.withD1(1.0);
ImmutableJdkOptionals o2 = ImmutableJdkOptionals.of(
Optional.of("v2"),
OptionalInt.of(1),
OptionalLong.empty(),
OptionalDouble.of(1.0));
check(o1).is(o2);
check(o1.hashCode()).is(o2.hashCode());
}
示例2: usingJava8
import java.util.OptionalDouble; //导入依赖的package包/类
public void usingJava8() {
// Using Java 8 techniques to find mean
OptionalDouble mean = Arrays.stream(testData).average();
if (mean.isPresent()) {
out.println("The mean is " + mean.getAsDouble());
} else {
out.println("The stream was empty");
}
mean = Arrays.stream(testData).average();
mean.ifPresent(x -> out.println("The mean is " + x));
mean = Arrays.stream(testData).average();
out.println("The mean is " + mean.orElse(0));
}
示例3: testMaxColumn
import java.util.OptionalDouble; //导入依赖的package包/类
@Test(dataProvider = "parallel")
public void testMaxColumn(boolean parallel) {
final DataFrame<String,String> frame = TestDataFrames.random(Double.class, 100000, 10).applyDoubles(v -> Math.random() * 10d);
final DataFrameColumns<String,String> columns = parallel ? frame.cols().parallel() : frame.cols();
final Optional<DataFrameColumn<String,String>> colMatch = columns.max((col1, col2) -> {
final double diff1 = col1.getDouble("R5") - col1.getDouble("R8");
final double diff2 = col2.getDouble("R5") - col2.getDouble("R8");
return Double.compare(Math.abs(diff1), Math.abs(diff2));
});
assertTrue(colMatch.isPresent(), "Column was matched");
final DataFrameColumn<String,String> column = colMatch.get();
final OptionalDouble expectedMin = frame.cols().stream().mapToDouble(col -> Math.abs(col.getDouble("R5") - col.getDouble("R8"))).max();
final double actualMin = Math.abs(column.getDouble("R5") - column.getDouble("R8"));
assertTrue(expectedMin.isPresent());
System.out.println("Min diff for " + column.key() + " for row " + column.ordinal());
assertEquals(actualMin, expectedMin.getAsDouble(), 0.0001);
}
示例4: alignMFs
import java.util.OptionalDouble; //导入依赖的package包/类
private double[] alignMFs( List<MiniFacade> out, boolean onlyOneHard ) {
OptionalDouble left = out.stream().filter( m -> !m.softLeft && (onlyOneHard || !m.softRight)).mapToDouble( m -> m.left ).average();
if ( left.isPresent() )
lp = left.getAsDouble();
else if (!onlyOneHard)
return null;
else
lp = out.stream().mapToDouble( m -> m.left ).min().getAsDouble();
OptionalDouble right = out.stream().filter( m -> !m.softRight && (onlyOneHard || !m.softLeft) ).mapToDouble( m -> m.left + m.width ).average();
if ( right.isPresent() )
rp = right.getAsDouble();
else if (!onlyOneHard)
return null;
else
rp = out.stream().mapToDouble( m -> m.left + m.width ).max().getAsDouble();
return new double[] {lp, rp};
}
示例5: testMaxRow
import java.util.OptionalDouble; //导入依赖的package包/类
@Test(dataProvider = "parallel")
public void testMaxRow(boolean parallel) {
final DataFrame<String,String> frame = TestDataFrames.random(Double.class, 100000, 10).applyDoubles(v -> Math.random() * 10d);
final DataFrameRows<String,String> rows = parallel ? frame.rows().parallel() : frame.rows();
final Optional<DataFrameRow<String,String>> rowMatch = rows.max((row1, row2) -> {
final double diff1 = row1.getDouble("C5") - row1.getDouble("C8");
final double diff2 = row2.getDouble("C5") - row2.getDouble("C8");
return Double.compare(Math.abs(diff1), Math.abs(diff2));
});
assertTrue(rowMatch.isPresent(), "Row was matched");
final DataFrameRow<String,String> minRow = rowMatch.get();
final OptionalDouble expectedMin = frame.rows().stream().mapToDouble(row -> Math.abs(row.getDouble("C5") - row.getDouble("C8"))).max();
final double actualMin = Math.abs(minRow.getDouble("C5") - minRow.getDouble("C8"));
assertTrue(expectedMin.isPresent());
System.out.println("Min diff for " + minRow.key() + " for row " + minRow.ordinal());
assertEquals(actualMin, expectedMin.getAsDouble(), 0.0001);
}
示例6: average
import java.util.OptionalDouble; //导入依赖的package包/类
/**
* {@inheritDoc}
*
* @implNote The {@code double} format can represent all
* consecutive integers in the range -2<sup>53</sup> to
* 2<sup>53</sup>. If the pipeline has more than 2<sup>53</sup>
* values, the divisor in the average computation will saturate at
* 2<sup>53</sup>, leading to additional numerical errors.
*/
@Override
public final OptionalDouble average() {
/*
* In the arrays allocated for the collect operation, index 0
* holds the high-order bits of the running sum, index 1 holds
* the low-order bits of the sum computed via compensated
* summation, index 2 holds the number of values seen, index 3
* holds the simple sum.
*/
double[] avg = collect(() -> new double[4],
(ll, d) -> {
ll[2]++;
Collectors.sumWithCompensation(ll, d);
ll[3] += d;
},
(ll, rr) -> {
Collectors.sumWithCompensation(ll, rr[0]);
Collectors.sumWithCompensation(ll, rr[1]);
ll[2] += rr[2];
ll[3] += rr[3];
});
return avg[2] > 0
? OptionalDouble.of(Collectors.computeFinalSum(avg) / avg[2])
: OptionalDouble.empty();
}
示例7: testMinRow
import java.util.OptionalDouble; //导入依赖的package包/类
@Test(dataProvider = "parallel")
public void testMinRow(boolean parallel) {
final DataFrame<String,String> frame = TestDataFrames.random(Double.class, 100000, 10).applyDoubles(v -> Math.random() * 10d);
final DataFrameRows<String,String> rows = parallel ? frame.rows().parallel() : frame.rows();
final Optional<DataFrameRow<String,String>> rowMatch = rows.min((row1, row2) -> {
final double diff1 = row1.getDouble("C5") - row1.getDouble("C8");
final double diff2 = row2.getDouble("C5") - row2.getDouble("C8");
return Double.compare(Math.abs(diff1), Math.abs(diff2));
});
assertTrue(rowMatch.isPresent(), "Row was matched");
final DataFrameRow<String,String> minRow = rowMatch.get();
final OptionalDouble expectedMin = frame.rows().stream().mapToDouble(row -> Math.abs(row.getDouble("C5") - row.getDouble("C8"))).min();
final double actualMin = Math.abs(minRow.getDouble("C5") - minRow.getDouble("C8"));
assertTrue(expectedMin.isPresent());
System.out.println("Min diff for " + minRow.key() + " for row " + minRow.ordinal());
assertEquals(actualMin, expectedMin.getAsDouble(), 0.0001);
}
示例8: serializeOptionalPrimitive
import java.util.OptionalDouble; //导入依赖的package包/类
@Test
public void serializeOptionalPrimitive() {
final OptionalPrimitiveTestEntity entity = new OptionalPrimitiveTestEntity();
entity.d = OptionalDouble.of(69.5);
entity.i = OptionalInt.of(69);
entity.l = OptionalLong.of(69L);
final VPackSlice vpack = vp.serialize(entity);
assertThat(vpack, is(notNullValue()));
assertThat(vpack.isObject(), is(true));
assertThat(vpack.get("d").isDouble(), is(true));
assertThat(vpack.get("d").getAsDouble(), is(69.5));
assertThat(vpack.get("i").isInteger(), is(true));
assertThat(vpack.get("i").getAsInt(), is(69));
assertThat(vpack.get("l").isInteger(), is(true));
assertThat(vpack.get("l").getAsLong(), is(69L));
}
示例9: test02
import java.util.OptionalDouble; //导入依赖的package包/类
@Test
public void test02() throws Exception {
try (SqlAgent agent = config.agent()) {
agent.required(() -> {
PropertyMapperTestEntity test1 = new PropertyMapperTestEntity(1);
test1.intValue = OptionalInt.empty();
test1.longValue = OptionalLong.empty();
test1.doubleValue = OptionalDouble.empty();
test1.dateValue = null;
test1.datetimeValue = null;
test1.enumValue = null;
test1.bigIntValue = null;
agent.insert(test1);
PropertyMapperTestEntity data = agent.find(PropertyMapperTestEntity.class, 1).orElse(null);
assertThat(data, is(test1));
});
}
}
示例10: testMinColumn
import java.util.OptionalDouble; //导入依赖的package包/类
@Test(dataProvider = "parallel")
public void testMinColumn(boolean parallel) {
final DataFrame<String,String> frame = TestDataFrames.random(Double.class, 100000, 10).applyDoubles(v -> Math.random() * 10d);
final DataFrameColumns<String,String> columns = parallel ? frame.cols().parallel() : frame.cols();
final Optional<DataFrameColumn<String,String>> colMatch = columns.min((col1, col2) -> {
final double diff1 = col1.getDouble("R5") - col1.getDouble("R8");
final double diff2 = col2.getDouble("R5") - col2.getDouble("R8");
return Double.compare(Math.abs(diff1), Math.abs(diff2));
});
assertTrue(colMatch.isPresent(), "Column was matched");
final DataFrameColumn<String,String> column = colMatch.get();
final OptionalDouble expectedMin = frame.cols().stream().mapToDouble(col -> Math.abs(col.getDouble("R5") - col.getDouble("R8"))).min();
final double actualMin = Math.abs(column.getDouble("R5") - column.getDouble("R8"));
assertTrue(expectedMin.isPresent());
System.out.println("Min diff for " + column.key() + " for row " + column.ordinal());
assertEquals(actualMin, expectedMin.getAsDouble(), 0.0001);
}
示例11: testFindLast_doubleStream
import java.util.OptionalDouble; //导入依赖的package包/类
public void testFindLast_doubleStream() {
Truth.assertThat(findLast(DoubleStream.of())).isEqualTo(OptionalDouble.empty());
Truth.assertThat(findLast(DoubleStream.of(1, 2, 3, 4, 5))).isEqualTo(OptionalDouble.of(5));
// test with a large, not-subsized Spliterator
List<Long> list =
LongStream.rangeClosed(0, 10000).boxed().collect(Collectors.toCollection(LinkedList::new));
Truth.assertThat(findLast(list.stream().mapToDouble(i -> i)))
.isEqualTo(OptionalDouble.of(10000));
// no way to find out the stream is empty without walking its spliterator
Truth.assertThat(findLast(list.stream().mapToDouble(i -> i).filter(i -> i < 0)))
.isEqualTo(OptionalDouble.empty());
}
示例12: parseDouble
import java.util.OptionalDouble; //导入依赖的package包/类
private static OptionalDouble parseDouble(String text) {
try {
return OptionalDouble.of(Double.parseDouble(text));
} catch (NumberFormatException e) {
return OptionalDouble.empty();
}
}
示例13: should_verify_an_actual_optional_double_is_conform_to_an_expected_result
import java.util.OptionalDouble; //导入依赖的package包/类
@Test
public void should_verify_an_actual_optional_double_is_conform_to_an_expected_result() {
assertThat(resultOf(() -> {
gwtMock.whenAnEventHappensInRelationToAnActionOfTheConsumer();
return OptionalDouble.of(123);
}).isPresent()).hasSameClassAs(assertThat(OptionalDouble.empty()));
}
示例14: parseFloat
import java.util.OptionalDouble; //导入依赖的package包/类
@Nonnull
public static OptionalDouble parseFloat(@Nonnull String s) {
try {
return OptionalDouble.of(Float.parseFloat(s));
} catch (NumberFormatException e) {
return OptionalDouble.empty();
}
}
示例15: parseDouble
import java.util.OptionalDouble; //导入依赖的package包/类
@Nonnull
public static OptionalDouble parseDouble(@Nonnull String s) {
try {
return OptionalDouble.of(Double.parseDouble(s));
} catch (NumberFormatException e) {
return OptionalDouble.empty();
}
}