Java 中的数组到流
先决条件: 爪哇溪流
使用 Arrays.stream() :
语法:
public static <T> Stream<T> getStream(T[] arr)
{
return Arrays.stream(arr);
}
where, T represents generic type.
示例 1 : Arrays.stream()将字符串数组转换为流。
// Java code for converting string array
// to stream using Arrays.stream()
import java.util.*;
import java.util.stream.*;
class GFG {
public static void main(String[] args)
{
// Converting String array to stream
String[] arr = { "Geeks", "for", "Geeks" };
// Using Arrays.stream to convert an
// array into Stream
Stream<String> stm = Arrays.stream(arr);
// Displaying elements in Stream
stm.forEach(str -> System.out.print(str + " "));
}
}
Output:
Geeks for Geeks
示例 2 : Arrays.stream()将 int 数组转换为 stream。
// Java code for converting string array
// to stream using Arrays.stream()
import java.util.*;
import java.util.stream.*;
class GFG {
public static void main(String[] args)
{
// Converting int array to stream
int arr[] = { 1, 2, 3, 4, 5 };
IntStream stm = Arrays.stream(arr);
stm.forEach(a -> System.out.print(a + " "));
}
}
Output:
1 2 3 4 5
示例 3 : Arrays.stream()将长数组和双数组转换为 stream。
// Java code for converting string array
// to stream using Arrays.stream()
import java.util.*;
import java.util.stream.*;
class GFG {
public static void main(String[] args)
{ // Converting long array to stream
long[] arrL = { 3L, 5L, 6L, 8L, 9L };
LongStream stmL = Arrays.stream(arrL);
stmL.forEach(number -> System.out.print(number + " "));
System.out.println();
// Converting double array to stream
double[] arrD = { 1, 2, 3, 4, 5 };
DoubleStream stmD = Arrays.stream(arrD);
stmD.forEach(d -> System.out.print(d + " "));
}
}
输出:
Output:
3 5 6 8 9
1.0 2.0 3.0 4.0 5.0
使用()的流、的流、的流、的流、&的流、的流:
语法:
public static <T> Stream<T> getStream(T[] arr)
{
return Stream.of(arr);
}
where, T represents generic type.
Syntax of other functions is similar
注意:对于对象数组，Stream.of()内部使用 Arrays.stream()。
示例 1 : Arrays.stream()将字符串数组转换为流。
// Java code for converting string array
// to stream using Stream.of()
import java.util.*;
import java.util.stream.*;
class GFG {
public static void main(String[] args)
{
// Converting String array to stream
String[] arr = { "Geeks", "for", "Geeks" };
// Using Arrays.stream to convert an
// array into Stream
Stream<String> stm = Stream.of(arr);
// Displaying elements in Stream
stm.forEach(str -> System.out.print(str + " "));
}
}
Output:
Geeks for Geeks
示例 2 : Arrays.stream()将 int 数组转换为 stream。
// Java code for converting string array
// to stream using IntStream.of()
import java.util.*;
import java.util.stream.*;
class GFG {
public static void main(String[] args)
{
// Converting int array to stream
int arr[] = { 1, 2, 3, 4, 5 };
IntStream stm = IntStream.of(arr);
stm.forEach(a -> System.out.print(a + " "));
}
}
Output:
1 2 3 4 5
示例 3 : Arrays.stream()将长数组和双数组转换为 stream。
// Java code for converting string array
// to stream using DoubleStream.of()
import java.util.*;
import java.util.stream.*;
class GFG {
public static void main(String[] args)
{ // Converting long array to stream
long[] arrL = { 3L, 5L, 6L, 8L, 9L };
LongStream stmL = LongStream.of(arrL);
stmL.forEach(number -> System.out.print(number + " "));
System.out.println();
// Converting double array to stream
double[] arrD = { 1, 2, 3, 4, 5 };
DoubleStream stmD = DoubleStream.of(arrD);
stmD.forEach(d -> System.out.print(d + " "));
}
}
输出:
Output:
3 5 6 8 9
1.0 2.0 3.0 4.0 5.0
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