43 lines
1.3 KiB
Java
43 lines
1.3 KiB
Java
package cn.bunny.stream;
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import org.junit.jupiter.api.Test;
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import java.math.BigInteger;
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import java.util.List;
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import java.util.stream.Stream;
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public class StreamTest {
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@Test
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void testStream() {
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// 产生随机数字流，会一直输出
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Stream<Double> stream = Stream.generate(Math::random);
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stream.forEach(System.out::println);
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}
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@Test
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void internalStream() {
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// 一直循环添加
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Stream<BigInteger> stream = Stream.iterate(BigInteger.ZERO, n -> n.add(BigInteger.ONE));
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stream.forEach(System.out::println);
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}
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@Test
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void testGeneratorLimit() {
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// 创建指定长度随机数
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List<Double> list = Stream.generate(Math::random).limit(10).toList();
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list.forEach(System.out::println);
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// 创建不好喊任何元素的流
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Stream<Object> empty = Stream.empty();
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empty.forEach(System.out::println);
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// 创建一个给定值的流
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Stream<Integer> integerStream = Stream.of(1, 2, 3, 4, 5, 6);
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integerStream.forEach(System.out::println);
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// 使用 ofNullable 创建一个流，如果值为 null 则创建一个空流
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Stream<String> stream = Stream.ofNullable("hello");
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stream.forEach(System.out::println);
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}
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}
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