将值数组转换为双数组

//package com.nowjava;


public class Main {// from 时 代 J a v a 公 众 号

    public static void main(String[] argv) throws Exception {

        float[] v = new float[] { 34.45f, 35.45f, 36.67f, 37.78f, 37.0000f,

                37.1234f, 67.2344f, 68.34534f, 69.87700f };

        System.out.println(java.util.Arrays.toString(toDouble(v)));

    }


    public static double[] toDouble(float[] v) {

        final double[] ans = new double[v.length];

        for (int k = 0; k < v.length; k++)

            ans[k] = (double) v[k];

        return (ans);

    }
    /**来自 
     时代Java - nowjava.com**/


    public static double[] toDouble(long[] v) {

        final double[] ans = new double[v.length];

        for (int k = 0; k < v.length; k++)

            ans[k] = (double) v[k];

        return (ans);

    }


    public static double[] toDouble(int[] v) {

        final double[] ans = new double[v.length];

        for (int k = 0; k < v.length; k++)

            ans[k] = (double) v[k];

        return (ans);

    }


    public static double[][] toDouble(float[][] v) {

        final double[][] ans = new double[v.length][];

        for (int k = 0; k < v.length; k++)

            ans[k] = toDouble(v[k]);

        return (ans);

    }


    public static double[][] toDouble(long[][] v) {

        final double[][] ans = new double[v.length][];

        for (int k = 0; k < v.length; k++)

            ans[k] = toDouble(v[k]);

        return (ans);

    }


    public static double[][] toDouble(int[][] v) {

        final double[][] ans = new double[v.length][];

        for (int k = 0; k < v.length; k++)

            ans[k] = toDouble(v[k]);

        return (ans);

    }


    /**

     * Returns a comma delimited string representing the value of the array.

     */

    public static String toString(double[] array) {


        StringBuffer buf = new StringBuffer(array.length);

        int i;

        for (i = 0; i < array.length - 1; i++) {

            buf.append(array[i]);

            buf.append(',');

        }

        buf.append(array[i]);

        return buf.toString();

    }


    /**

     * Returns a comma delimited string representing the value of the array.

     */

    public static String toString(double[][] array) {

        StringBuffer buf = new StringBuffer();

        for (int k = 0; k < array.length; k++) {

            buf.append(toString(array[k]));

            buf.append(System.getProperty("line.separator"));

        }

        return buf.toString();

    }


    /**

     * Returns a comma delimited string representing the value of the array.

     */

    public static String toString(int[] array) {

        StringBuffer buf = new StringBuffer(array.length);