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yenerm/OptionalSample.java

Created June 16, 2020 18:56
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Optional Sample
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OptionalSample.java
<!-- Copyright 2019 Google LLC.
SPDX-License-Identifier: Apache-2.0 -->
Optional<String> opt = Optional.of("Java 8");
if (opt.isPresent()){ //true
//...
}
opt = Optional.ofNullable(null);
if (opt.isEmpty()){ //true
//…
}
opt.ifPresent(str -> System.out.println(str)); //false, doesn’t print
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