都知道在大数据量情况下，使用String的split截取字符串效率很低，这种时候可以用substring，stringTokenizer 代替，效率会有一定的提高，而stringTokenizer中实际是通过调用substring实现的。
stringTokenizer中nextToken()代码如下:
public String nextToken() { /* * If next position already computed in hasMoreElements() and * delimiters have changed between the computation and this invocation, * then use the computed value. */ currentPosition = (newPosition >= 0 && !delimsChanged) ? newPosition : skipDelimiters(currentPosition); /* Reset these anyway */ delimsChanged = false; newPosition = -1; if (currentPosition >= maxPosition) throw new NoSuchElementException(); int start = currentPosition; currentPosition = scanToken(currentPosition); return str.substring(start, currentPosition); }
想要查看测试结果可以看这篇博客 点击打开链接 忽略其中的stringTokenizer部分。stringTokenizer应该并不会比substring高效。而且StringTokenizer是出于兼容性的原因而被保留的遗留类(在新代码中并不鼓励使用它)
