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Java OptionalDouble.ifPresent方法代码示例

本文整理汇总了Java中java.util.OptionalDouble.ifPresent方法的典型用法代码示例。如果您正苦于以下问题:Java OptionalDouble.ifPresent方法的具体用法?Java OptionalDouble.ifPresent怎么用?Java OptionalDouble.ifPresent使用的例子?那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在java.util.OptionalDouble的用法示例。


在下文中一共展示了OptionalDouble.ifPresent方法的4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: usingJava8

import java.util.OptionalDouble; //导入方法依赖的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));

}
 
开发者ID:PacktPublishing,项目名称:Java-Data-Science-Made-Easy,代码行数:17,代码来源:Main.java

示例2: testEmpty

import java.util.OptionalDouble; //导入方法依赖的package包/类
@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));
}
 
开发者ID:lambdalab-mirror,项目名称:jdk8u-jdk,代码行数:17,代码来源:BasicDouble.java

示例3: testPresent

import java.util.OptionalDouble; //导入方法依赖的package包/类
@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));
}
 
开发者ID:lambdalab-mirror,项目名称:jdk8u-jdk,代码行数:28,代码来源:BasicDouble.java

示例4: testEmpty

import java.util.OptionalDouble; //导入方法依赖的package包/类
@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));
}
 
开发者ID:AdoptOpenJDK,项目名称:openjdk-jdk10,代码行数:33,代码来源:BasicDouble.java


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