有没有像Enumerable.Range(X,Y)在Java的东西吗? [英] Is there anything like Enumerable.Range(x,y) in Java?

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问题描述

有什么样的C#/。NET的

Is there something like C#/.NET's

IEnumerable<int> range = Enumerable.Range(0, 100); //.NET

在Java中?

in Java?

推荐答案

编辑:从Java 8,这是可能的 java.util.stream.IntStream.range(INT startInclusive,诠释endExclusive)

Edited: As Java 8, this is possible with java.util.stream.IntStream.range(int startInclusive, int endExclusive)

有没有这样的事情在Java中,但你可以有这样的事情:

There is not such thing in Java but you can have something like this:

import java.util.Iterator;

public class Range implements Iterable<Integer> {
    private int min;
    private int count;

    public Range(int min, int count) {
        this.min = min;
        this.count = count;
    }

    public Iterator<Integer> iterator() {
        return new Iterator<Integer>() {
            private int cur = min;
            private int count = Range.this.count;
            public boolean hasNext() {
                return count != 0;
            }

            public Integer next() {
                count--;
                return cur++; // first return the cur, then increase it.
            }

            public void remove() {
                throw new UnsupportedOperationException();
            }
        };
    }
}

例如,你可以使用范围通过这种方式:

For example you can use Range by this way:

public class TestRange {

    public static void main(String[] args) {
        for (int i : new Range(1, 10)) {
            System.out.println(i);
        }
    }

}

另外,如果你不喜欢使用新范围(1,10)直接,您可以使用工厂类的:

Also if you don't like use new Range(1, 10) directly, you can use factory class for it:

public final class RangeFactory {
    public static Iterable<Integer> range(int a, int b) {
        return new Range(a, b);
    }
}

这是我厂的测试:

public class TestRangeFactory {

    public static void main(String[] args) {
        for (int i : RangeFactory.range(1, 10)) {
            System.out.println(i);
        }
    }

}

我希望这将是有益的:)

I hope these will be useful :)

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