I genius the official free tutorial 27: Java Basic teaching Arrays class

Arrays Class

An array of tool classes that provide a number of static methods for manipulating arrays;
Not much to say, directly on the example

Example://Declaration Package package array;//Import Package//role: Tell the system, Arraysdemo class used to arrays class to java.util package to find arrays class import  java.util.arrays;/** *  common ways to demonstrate Arrays class  *  @author   Genius Alliance  -  Yukun  */public  class arraysdemo {public static void main (String[] args)  {//  Declares three arrays of int[] array1 = { 1, 2, 3 };int[] array2 = { 1,  2, 3 };int[] array3 = { 1, 2, 3, 6, 5, 4 }; System.out.println ("----------  compare two arrays  ----------");//Compare the contents of the array array1 and Array2 boolean  Compare12result = arrays.equals (array1, array2);//Compare the contents of the array array2 and Array3 boolean  Compare23result = arrays.equals (ARRAY1, ARRAY3); System.out.println ("Array1 and array2 the results of the comparison:" +compare12result); System.out.println ("Array2 and Array3 compare to:" +compare23result);/* *  first parameter: Incoming copied array, second parameter: new array length copied  *   When the length of the new array is greater than the old array length, the extra part is filled with the default value corresponding to the data type * ARRAY1:[1, 2, 3] Use the following code to copy after arraycopy:[1, 2, 3, 0, 0] */int[]  arraycopy = arrays.copyof (array1, 5); System.out.println ("-----------  original array  -----------");//traverse the original array arraytostring (ARRAY1); System.out.println ("-----------  copied array  -----------");//Iterate over the copied array arraytostring (arrayCopy); SYSTEM.OUT.PRINTLN ("array  ----------before----------  replace value");//iterate over the array array1arraytostring (ARRAY1) before replacing; System.out.println (array  ----------after----------  replace value);/* *  replaces all values in the array with the same value  *  First parameter: Replaced array  *  second parameter: Replaced value  */arrays.fill (ARRAY1, 10);//traversal of replaced array array1arraytostring (ARRAY1) ; System.out.println ("----------  array before sorting  ----------");//The array array3arraytostring (ARRAY3) before traversing the sort;// Sort the array array3 (only in ascending order) Arrays.sort (ARRAY3); System.out.println ("----------  sorted array  ----------");//Iterate through the sorted array array3arraytostring (ARRAY3); SYSTEM.OUT.PRINTLN ("-----  using dichotomy (binary) to find elements  -----");//using dichotomy to find elements in an array, the lookup array must be sorted in ascending order int  Index = arrays.binarysearch (array3, 4); System.out.println ("4 in the array array3 subscript is:"  + index);} /** *  converts an array to a string and outputs  */private static void arraytostring (Int[] array)  {//converts the contents of an array to a string  string arraystr = arrays.tostring (array); System.out.println (ARRAYSTR);}} Run Result:---------  compare two arrays  ---------array1 and Array2 compare to: false-----------  original array, truearray2 and Array3  -----------[1, 2, 3]-----------  copied arrays  -----------[1, 2, 3, 0, 0] Array before---------  replace value  ---------[1, 2, 3]---------  Replace value after the array  ---------[10, 10,  10]---------  array before sorting  ---------[1, 2, 3, 6, 5, 4]---------  sorted array  ----------[1, 2, 3, 4, 5, 6]-----  Find elements  -----using dichotomy (binary) 4 the subscript in the array array3 is: 3

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I genius the official free tutorial 27: Java Basic teaching Arrays class