Print array--arrays.tostring (a)

First Knowledge

The array was previously printed with a For loop. One day I saw someone using arrays.tostring (a) to print, wonderful.

Example

package com;

Import Java.util.Arrays;

/**
 * Created by Kenneth on 2017/4/6.
 *
/public class Test {public
    static void Main (string[] args) {
        int[] arr = {3, 2, 8,};
        System.out.println (arrays.tostring (arr));
    }

Source

public static String toString (int[] a) {
    if (a = = null) return
        "null";
    int iMax = a.length-1;
    if (IMax = = 1) return
        "[]";

    StringBuilder B = new StringBuilder ();
    B.append (' [');
    for (int i = 0;; i++) {
        b.append (a[i]);
        if (i = = IMax) return
            b.append ('] '). toString ();
        B.append (",");
    }
}

You can see that the source code also used for the loop to splice. Developers directly use Arrays.tostring (a) to reduce the amount of code.