Java练习之使用StringBuilder

package string.demo;

/*
 * 将数组变为字符串输出
 */
public class StringBuilderTest
{

    /**
     * @param args
     */
    public static void main(String[] args)
    {
        int[] arr = {2, 3, 41, 4};
        String str = arrayToString_2(arr);
        System.out.println(str);
        
    }
    
    private static String arrayToString_2(int[] arr)
    {
        StringBuilder sb = new StringBuilder("[");
        for (int i = 0; i < arr.length; i++)
        {
            if (i != arr.length - 1)
                sb.append(arr[i] + ", ");
            else
                sb.append(arr[i] + "]");
        }
        return sb.toString();
    }

    public static String arrayToString_1(int[] arr)
    {
        String str = "[";
        for (int i = 0; i < arr.length; i++)
        {
            if (i != arr.length - 1)
                str += arr[i] + ", ";
            else
                str += arr[i] + "]";
        }
        return str;
    }
}