Sets an array to the specified length scraping or padding the end if necessary. - Java Collection Framework

Java examples for Collection Framework:Array Length

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Description

Sets an array to the specified length scraping or padding the end if necessary.

Demo Code


//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        double[] data = new double[] { 34.45, 35.45, 36.67, 37.78, 37.0000,
                37.1234, 67.2344, 68.34534, 69.87700 };
        int length = 2;
        System.out.println(java.util.Arrays
                .toString(setLengthFromBeginning(data, length)));
    }/*from w ww.  ja  va 2  s .  c  om*/

    /**
     * Sets an array to the specified length scraping or
     * padding the end if necessary.
     */
    public static double[] setLengthFromBeginning(double[] data, int length) {
        double[] ans = new double[length];
        int debut;
        if (length - data.length < 0)
            debut = data.length - length;
        else
            debut = 0;
        System.arraycopy(data, 0, ans, 0, data.length - debut);
        return (ans);
    }

    /**
     * Sets an array to the specified length scraping or
     * padding the end if necessary.
     */
    public static int[] setLengthFromBeginning(int[] data, int length) {
        int[] ans = new int[length];
        int debut;
        if (length - data.length < 0)
            debut = data.length - length;
        else
            debut = 0;
        System.arraycopy(data, 0, ans, 0, data.length - debut);
        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);
        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(int[][] 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();
    }
}

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