Java 中的 IntStream max()，示例
原文:https://www . geesforgeks . org/int stream-max-in-Java-with-examples/
Java 8 中的 java.util.stream.IntStream 处理原语 int。它以一种新的方式解决了求数组中的最大值、求数组中的最小值、求数组中所有元素的和、求数组中所有值的平均值等问题。 IntStream max() 返回描述该流最大元素的 OptionalInt，如果该流为空，则返回空的 optional int。
语法:
OptionalInt() max()
Where, OptionalInt is a container object which
may or may not contain a int value.
例 1 :
// Java code for IntStream max()
import java.util.*;
import java.util.stream.IntStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// creating a stream
IntStream stream = IntStream.of(-9, -18, 54, 8, 7, 14, 3);
// OptionalInt is a container object
// which may or may not contain a
// int value.
OptionalInt obj = stream.max();
// If a value is present, isPresent() will
// return true and getAsInt() will
// return the value
if (obj.isPresent()) {
System.out.println(obj.getAsInt());
}
else {
System.out.println("-1");
}
}
}
输出:
54
例 2 :
// Java code for IntStream max()
// to get the maximum value in range
// excluding the last element
import java.util.*;
import java.util.stream.IntStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// To find maximum in given range
IntStream stream = IntStream.range(50, 75);
// storing the maximum value in variable
// if it is present, else show -1.
int maximum = stream.max().orElse(-1);
// displaying the maximum value
System.out.println(maximum);
}
}
输出:
74
例 3 :
// Java code for IntStream max()
// to get the maximum value in range
// excluding the last element
import java.util.*;
import java.util.stream.IntStream;
class GFG {
// Driver code
public static void main(String[] args)
{
// To find maximum in given range
IntStream stream = IntStream.range(50, 50);
// storing the maximum value in variable
// if it is present, else show -1.
int maximum = stream.max().orElse(-1);
// displaying the maximum value
System.out.println(maximum);
}
}
输出:
-1
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