在程序中,我们可以分别使用replace和replaceAll方法替换一个较长的字符串,然后使用System.nanoTime()来计算执行时间。 publicclassReplaceTest{publicstaticvoidmain(String[]args){Stringstr="This is a test string. We will replace some characters in it.";longstartTime=System.nanoTime();str.replace("e","E...
另外转一个java 的string的replace和replaceAll作为备忘: JAVA中string.replace()和string.replaceAll()的区别及用法 乍一看,字面上理解好像replace只替换第一个出现的字符(受javascript的影响),replaceall替换所有的字符,其实大不然,只是替换的用途不一样。 public String replace(char oldChar,char newChar) 1. 返回一...
String replaceFirst(String regex,String replacement) Replaces the first substring of this string that matches the givenregular expression with the given replacement. String toLowerCase() Converts all of the characters in this String to lower case using the rules of the default locale. StringtoLower...
The String class does have four methods for replacing found characters or substrings, however. They are: Methods in the String Class for Manipulating Strings MethodDescription String replace(char oldChar, char newChar) Returns a new string resulting from replacing all occurrences of oldChar in this...
If you need to match substring containing these metacharacters, you can either escape these characters using\or use thereplace()method. // Program to replace the + characterclassMain{publicstaticvoidmain(String[] args){ String str1 ="+a-+b";// replace "+" with "#" using replaceAll()//...
string.replace(CharSequence oldText, CharSequence newText) Here, string is an object of the String class. replace() Parameters To replace a single character, the replace() method takes these two parameters: oldChar - the character to be replaced in the string newChar - matching characters are...
publicstaticvoidmain(String[] args) { //创建可变字符串,开辟了一个默认是长度为0,容量为16个字符的空间 StringBuffer sb = newStringBuffer(); System.out.println("输出可变字符串的长度:" + sb.length()+ "输出可变字符串的容量:" + sb.capacity()); ...
{/**The value is used for character storage.*/privatefinalcharvalue[];/**The offset is the first index of the storage that is used.*/privatefinalintoffset;/**The count is the number of characters in the String.*/privatefinalintcount;/**Cache the hash code for the string*/privateinthas...
对于 Java 初学者， 对于 String 是不可变对象总是存有疑惑。例如如下代码：Strings="ABCabc";System....
StringBuilder&StringBuffer底层:非常重要的两个属性: /**该值用于字符存储 * The value is used for character storage. */char[] value;/**计数是使用的字符数 * The count is the number of characters used. */intcount; 每个字符串生成器都有一定的容量。只要字符串生成器所包含的字符序列的长度没有超出...