比较一下String.split方法和indexOf + subString方法截取字符串

方法和indexOf + subString方法截取字符串"/>

比较一下String.split方法和indexOf + subString方法截取字符串

直接上代码

public static void main(String[] args) throws ParseException{String str = "AB123456";long start = System.currentTimeMillis();for(int i = 0 ; i < 10 * 10000 ; i ++){String[] lines = str.split("\\D+");}long end = System.currentTimeMillis();System.out.println("split time consumed:" + (end - start) / 1000.0 + "s");start = System.currentTimeMillis();int index = -1;for(int i = 0 ; i < 10 * 10000 ; i ++){index = -1;for(int k = 0 ; k < str.length() ; k ++){if(str.charAt(k) >= '0' && str.charAt(k) <= '9'){index = k;break;}}if(index > 0){String[] lines = new String[]{str.substring(0, index),str.substring(index)};}}end = System.currentTimeMillis();System.out.println("indexof time consumed:" + (end - start) / 1000.0 + "s");
}

以下是输出结果：

split time consumed:0.104s
indexof time consumed:0.007s

虽然表面上看，split比index + subString要简单很多，但后者性能是前者的将近15倍。