返回数组的副本。

//package com.nowjava;
/* 
*来 自
 N o w J a v a . c o m - 时代Java
*/


public class Main {

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

        int[] array = new int[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };

        System.out.println(java.util.Arrays.toString(copy(array)));

    }


    /**

     * Returns a copy of the array.

     */

    //a call to array.clone() may also work although this is a primitive type. I haven't checked

    //it even may be faster

    public static int[] copy(int[] array) {

        int[] result;

        result = new int[array.length];
        /* 
        *来 自
         时代Java - N o w  J a v a . c o m
        */

        System.arraycopy(array, 0, result, 0, array.length);

        return result;

    }


    /**

     * Returns a copy of the array.

     */

    //a call to array.clone() may also work although this is a primitive type. I haven't checked

    //it even may be faster

    public static long[] copy(long[] array) {

        long[] result;

        result = new long[array.length];

        System.arraycopy(array, 0, result, 0, array.length);

        return result;

    }


    /**

     * Returns a copy of the array.

     */

    //a call to array.clone() may also work although this is a primitive type. I haven't checked

    //it even may be faster

    public static float[] copy(float[] array) {

        float[] result;

        result = new float[array.length];

        System.arraycopy(array, 0, result, 0, array.length);

        return result;

    }


    /**

     * Returns a copy of the array.

     */

    //a call to array.clone() may also work although this is a primitive type. I haven't checked

    //it even may be faster

    public static double[] copy(double[] array) {

        double[] result;

        result = new double[array.length];

        System.arraycopy(array, 0, result, 0, array.length);

        return result;

    }


    /**

     * Returns a copy of the array.

     */

    public static double[][] copy(double[][] v) {

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

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

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

        return (ans);

    }


    /**

     * Returns a copy of the array.

     */

    public static int[][] copy(int[][] v) {

        int[][] ans = new int[v.length][];

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

            ans[k] = copy(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) {