本文整理匯總了Java中java.util.OptionalDouble.ifPresent方法的典型用法代碼示例。如果您正苦於以下問題：Java OptionalDouble.ifPresent方法的具體用法？Java OptionalDouble.ifPresent怎麽用？Java OptionalDouble.ifPresent使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類java.util.OptionalDouble的用法示例。
在下文中一共展示了OptionalDouble.ifPresent方法的4個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Java代碼示例。
示例1: usingJava8
import java.util.OptionalDouble; //導入方法依賴的package包/類
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2: testEmpty
import java.util.OptionalDouble; //導入方法依賴的package包/類
@Test(groups = "unit")
public void testEmpty() {
OptionalDouble empty = OptionalDouble.empty();
OptionalDouble present = OptionalDouble.of(1.0);
// empty
assertTrue(empty.equals(empty));
assertTrue(empty.equals(OptionalDouble.empty()));
assertTrue(!empty.equals(present));
assertTrue(0 == empty.hashCode());
assertTrue(!empty.toString().isEmpty());
assertTrue(!empty.isPresent());
empty.ifPresent(v -> { fail(); });
assertEquals(2.0, empty.orElse(2.0));
assertEquals(2.0, empty.orElseGet(()-> 2.0));
}
示例3: testPresent
import java.util.OptionalDouble; //導入方法依賴的package包/類
@Test(groups = "unit")
public void testPresent() {
OptionalDouble empty = OptionalDouble.empty();
OptionalDouble present = OptionalDouble.of(1.0);
// present
assertTrue(present.equals(present));
assertFalse(present.equals(OptionalDouble.of(0.0)));
assertTrue(present.equals(OptionalDouble.of(1.0)));
assertTrue(!present.equals(empty));
assertTrue(Double.hashCode(1.0) == present.hashCode());
assertFalse(present.toString().isEmpty());
assertTrue(-1 != present.toString().indexOf(Double.toString(present.getAsDouble()).toString()));
assertEquals(1.0, present.getAsDouble());
try {
present.ifPresent(v -> { throw new ObscureException(); });
fail();
} catch(ObscureException expected) {
}
assertEquals(1.0, present.orElse(2.0));
assertEquals(1.0, present.orElseGet(null));
assertEquals(1.0, present.orElseGet(()-> 2.0));
assertEquals(1.0, present.orElseGet(()-> 3.0));
assertEquals(1.0, present.<RuntimeException>orElseThrow(null));
assertEquals(1.0, present.<RuntimeException>orElseThrow(ObscureException::new));
}
示例4: testEmpty
import java.util.OptionalDouble; //導入方法依賴的package包/類
@Test(groups = "unit")
public void testEmpty() {
OptionalDouble empty = OptionalDouble.empty();
OptionalDouble present = OptionalDouble.of(1.0);
// empty
assertTrue(empty.equals(empty));
assertTrue(empty.equals(OptionalDouble.empty()));
assertTrue(!empty.equals(present));
assertTrue(0 == empty.hashCode());
assertTrue(!empty.toString().isEmpty());
assertTrue(!empty.isPresent());
empty.ifPresent(v -> { fail(); });
AtomicBoolean emptyCheck = new AtomicBoolean();
empty.ifPresentOrElse(v -> fail(), () -> emptyCheck.set(true));
assertTrue(emptyCheck.get());
try {
empty.ifPresentOrElse(v -> fail(), () -> { throw new ObscureException(); });
fail();
} catch (ObscureException expected) {
} catch (AssertionError e) {
throw e;
} catch (Throwable t) {
fail();
}
assertEquals(2.0, empty.orElse(2.0));
assertEquals(2.0, empty.orElseGet(()-> 2.0));
}