JavaSE8基础 Arrays.toString 将一维int数组转成字符串输出

package jizuiku2;

import java.util.Arrays;

public class Demo100 {
	public static void main(String[] args) {

		String str = Arrays.toString(new int[] { 1, 2, 3, 4, 5 });
		System.out.println(str);
	}
}

    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(", ");
        }
    }