Arrays#setAll
To quote the Javadoc:
使用提供的生成器函数来计算每个元素,设置指定数组的所有元素.
Set all elements of the specified array, using the provided generator function to compute each element.
i->Math.random()
部分提供了我们的生成器功能.
The i -> Math.random()
part is providing our generator function.
import java.util.Arrays;
public class Main {
public static void main(String[] args) {
double[] numList = new double[50];
Arrays.setAll(numList, i -> Math.random());
System.out.println(Arrays.toString(numList));
}
}
示例运行的输出:
[0.43553825429447723、0.808120954335018、0.12393048842865151,0.8280050339559442,0.13046729109938549,0.46971055415131957,0.0847544966916538,0.9514556138831699,0.0027874719368471412,0.2826487547173526,0.9613735880245629,0.511374218080356,0.4181880179563505,0.6794710449125567,0.11245752761803662,0.7441683829312368,0.18231946738188654,0.033135972701688,0.6768385881323342,0.05649510937114155,0.7119571752891306,0.4948538317612915,0.5744063857753579,0.09744198319274944,0.5855447565472038,0.8802179102691605,0.2335661700783871,0.1223125934194853,0.21850974856355443,0.0729073196898683,0.6466093693534394,0.2427728538560776,0.6909697855419995,0.5490190380915355,0.9021970128518985,0.18252974719305692,0.8189241745090639,0.7901262001450492,0.1732578238075676,0.7133774337961251,0.40475245364411927,0.549448711998736,0.2489547800535582,0.03336023605789973,0.22881799744124198,0.16306093388668053,0.09097495280977719,0.966965444050888,0.7512014132665311,0.3568509914370782]
[0.43553825429447723, 0.808120954335018, 0.12393048842865151,
0.8280050339559442, 0.13046729109938549, 0.46971055415131957, 0.0847544966916538, 0.9514556138831699, 0.0027874719368471412, 0.2826487547173526, 0.9613735880245629, 0.511374218080356, 0.4181880179563505, 0.6794710449125567, 0.11245752761803662, 0.7441683829312368, 0.18231946738188654, 0.033135972701688, 0.6768385881323342, 0.05649510937114155, 0.7119571752891306, 0.4948538317612915, 0.5744063857753579, 0.09744198319274944, 0.5855447565472038, 0.8802179102691605, 0.2335661700783871, 0.1223125934194853, 0.21850974856355443, 0.0729073196898683, 0.6466093693534394, 0.2427728538560776, 0.6909697855419995, 0.5490190380915355, 0.9021970128518985, 0.18252974719305692, 0.8189241745090639, 0.7901262001450492, 0.1732578238075676, 0.7133774337961251, 0.40475245364411927, 0.549448711998736, 0.2489547800535582, 0.03336023605789973, 0.22881799744124198, 0.16306093388668053, 0.09097495280977719, 0.966965444050888, 0.7512014132665311, 0.3568509914370782]
或者,
import java.util.Arrays;
import java.util.stream.IntStream;
public class Main {
public static void main(String[] args) {
double[] numList = IntStream.range(0, 50)
.mapToDouble(i -> Math.random()).toArray();
System.out.println(Arrays.toString(numList));
}
}
或者,
import java.util.Arrays;
import java.util.Random;
public class Main {
public static void main(String[] args) {
double[] array = new Random().doubles(50).toArray();
System.out.println(Arrays.toString(array));
}
}
或者,
import java.util.Arrays;
import java.util.concurrent.ThreadLocalRandom;
public class Main {
public static void main(String[] args) {
double[] array = ThreadLocalRandom.current().doubles(50).toArray();
System.out.println(Arrays.toString(array));
}
}
或者,
import java.util.Arrays;
import java.util.concurrent.ThreadLocalRandom;
public class Main {
public static void main(String[] args) {
final int SIZE = 50;
double[] array = new double[SIZE];
for (int i = 0; i < SIZE; i++) {
array[i] = ThreadLocalRandom.current().nextDouble();
}
System.out.println(Arrays.toString(array));
}
}
或者,
import java.util.Arrays;
import java.util.stream.Stream;
public class Main {
public static void main(String[] args) {
Double[] array = Stream.generate(Math::random).limit(50).toArray(Double[]::new);
System.out.println(Arrays.toString(array));
}
}
或者,
import java.util.Arrays;
import java.util.stream.Stream;
public class Main {
public static void main(String[] args) {
double[] array = Stream.generate(Math::random).limit(50).mapToDouble(Double::valueOf).toArray();
System.out.println(Arrays.toString(array));
}
}
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