Java 如何将其返回到数组或double列表中
我无法将其检索到数组或集合中,我该怎么做Java 如何将其返回到数组或double列表中,java,arrays,java-stream,flatmap,Java,Arrays,Java Stream,Flatmap,我无法将其检索到数组或集合中,我该怎么做 Stream<double[]> pyt = IntStream.rangeClosed(1, 100) .boxed().flatMap(a->IntStream.rangeClosed(a, 100) .mapToObj(b->new double[]{a,b,Math.sqrt(a*a+b*b)}) .filter(t-&
Stream<double[]> pyt = IntStream.rangeClosed(1, 100)
.boxed().flatMap(a->IntStream.rangeClosed(a, 100)
.mapToObj(b->new double[]{a,b,Math.sqrt(a*a+b*b)})
.filter(t->t[2]%1==0));
现在还不清楚你到底想要实现什么。目前,您有一个
双[]
数组流。如果要将它们收集到double[][
数组中,则需要编写:
double[][] arr = IntStream.rangeClosed(1, 100)
.boxed()
.flatMap(a->IntStream.rangeClosed(a, 100)
.mapToObj(b->new double[]{a,b,Math.sqrt(a*a+b*b)})
.filter(t->t[2]%1==0))
.toArray(double[][]::new);
如果要将其展平为double[]
array,则需要编写
double[] arr = IntStream.rangeClosed(1, 100)
.boxed()
.flatMap(a->IntStream.rangeClosed(a, 100)
.mapToObj(b->new double[]{a,b,Math.sqrt(a*a+b*b)})
.filter(t->t[2]%1==0))
.flatMapToDouble(Arrays::stream)
.toArray();
现在还不清楚你到底想要实现什么。目前,您有一个
双[]
数组流。如果要将它们收集到double[][
数组中,则需要编写:
double[][] arr = IntStream.rangeClosed(1, 100)
.boxed()
.flatMap(a->IntStream.rangeClosed(a, 100)
.mapToObj(b->new double[]{a,b,Math.sqrt(a*a+b*b)})
.filter(t->t[2]%1==0))
.toArray(double[][]::new);
如果要将其展平为double[]
array,则需要编写
double[] arr = IntStream.rangeClosed(1, 100)
.boxed()
.flatMap(a->IntStream.rangeClosed(a, 100)
.mapToObj(b->new double[]{a,b,Math.sqrt(a*a+b*b)})
.filter(t->t[2]%1==0))
.flatMapToDouble(Arrays::stream)
.toArray();