Sets an array to the specified length scraping or padding the beginning 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 beginning 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(setLengthFromEnd(data,
                length)));//w  w  w .j  a  v a2 s  .co m
    }

    /**
     * Sets an array to the specified length scraping or
     * padding the beginning if necessary.
     */
    public static double[] setLengthFromEnd(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, debut, ans, -data.length + length + debut,
                data.length - debut);
        return (ans);
    }

    /**
     * Sets an array to the specified length scraping or
     * padding the beginning if necessary.
     */
    public static int[] setLengthFromEnd(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, debut, ans, -data.length + length + debut,
                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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