java编程思想_008产生指定数组类

package wzs.test2;

import java.util.Arrays;

//产生指定数组类
public class Test
{
public static void main(String[] args)
{
int[] a1 = rang(10);
int[] a2 = rang(2, 10);
int[] a3 = rang(2, 10, 2);
System.out.println("a1:" + Arrays.toString(a1));
System.out.println("a2:" + Arrays.toString(a2));
System.out.println("a3:" + Arrays.toString(a3));
}

/**
* 0 -- n
* @param n
* @return
*/
public static int[] rang(int n)
{
int[] result = new int
;
for (int i = 0; i < n; i++)
{
result[i] = i;
}
return result;
}

/**
* start -- end
* @param start
* @param end
* @return
*/
public static int[] rang(int start, int end)
{
int size = end - start;
int[] result = new int[size];
for (int i = 0; i < size; i++)
{
result[i] = start + i;
}
return result;
}

/**
* start -- end 步长为step
* @param start
* @param end
* @param step
* @return
*/
public static int[] rang(int start, int end, int step)
{
int size = (end - start) / step;
int[] result = new int[size];
for (int i = 0; i < size; i++)
{
result[i] = start + i * step;
}
return result;
}
}