30 lines
870 B
Java
30 lines
870 B
Java
package stream;
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import java.util.Comparator;
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import java.util.Optional;
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import java.util.stream.Stream;
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public class StreamExample05 {
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public static void main(String[] args) {
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// 计数
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long count = Stream.of(1, 2, 3, 4, 5, 6, 7, 8, 9)
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.count();
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System.out.println(count);// 9
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// 求和
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long sum = Stream.of(1, 2, 3, 4, 5, 6, 7, 8, 9)
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.mapToLong(Integer::longValue)
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.sum();
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System.out.println(sum);
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// 查找最小值
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Stream.of(1, 2, 3, 4, 5, 6, 7, 8, 9)
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.min(Comparator.comparing(i -> i))
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.ifPresent(System.out::println);
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// 查找最大值
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Optional<Integer> max = Stream.of(1, 2, 3, 4, 5, 6, 7, 8, 9)
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.max(Comparator.comparing(i -> i));
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System.out.println(max.get());
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}
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} |