«Class»String-value: char[]+substring(int beginIndex) : String+substring(int beginIndex, int endIndex) : String+replace(char oldChar, char newChar) : String+replace(CharSequence target, CharSequence replacement) : String 在上图中,我们定义了String类,并展示了其包含的substring和replace两个方法。
为了比较substring方法和replace方法的性能,我们将对一个较长的字符串执行多次替换操作,并计算执行时间。 2.1 使用substring方法 Stringstr="Hello, World!";longstartTime=System.nanoTime();for(inti=0;i<10000;i++){str=str.substring(0,7)+"Java"+str.substring(12);}longendTime=System.nanoTime();Syste...
JAVA字符串简单处理--substring,replace,split 例如: String[] str={"222","555","111"};String[] str2=newString[3]; str2[0]="22"; str2[1]="44"; str2[2]="33"; System.out.print("str字符串:");for(inti=0;i<str.length;++i){ System.out.print(str[i]+","); } System.out.p...
The resulting string Since: 1.5 replaceFirst String java.lang.String.replaceFirst(String regex, String replacement) Replaces the first substring of this string that matches the given regular expression with the given replacement. An invocation of this method of the form str.replaceFirst(regex, repl...
Stringstring="how to do in java";StringupdatedString=string.replaceFirst("\\s","-");System.out.println(updatedString);//how-to do in java 3. Escaping Special Characters with Double Backslash Although we can pass the regex as a substring pattern to match, the original string may contain sp...
*/ public String replace(CharSequence target, CharSequence replacement) { return Pattern.compile(target.toString(),Pattern.LITERAL). matcher(this).replaceAll(Matcher.quoteReplacement(replacement.toString())); } ... /** * Replaces each substring of this string that matches the given regular ...
oldText - the substring to be replaced in the string newText - matching substrings are replaced with this string replace() Return Value The replace() method returns a new string where each occurrence of the matching character/text is replaced with the new character/text. Example 1: Java Str...
String#forEach 函数原型 : 代码语言:javascript 代码运行次数:0 运行 AI代码解释 /** * 在每个字符上执行给定的[动作]。 */publicinline fun CharSequence.forEach(action:(Char)->Unit):Unit{for(elementinthis)action(element)} 代码示例 : 代码语言:javascript ...
Thereplace()method does not change the original string. Note If you replace a value, only the first instance will be replaced. To replace all instances, use a regular expression with the g modifier set. Read more about regular expressions in our: ...
上面是API中给予的解释,在java.lang.String类里。其实就是一个字符串替换函数,使用例子如下:"aabbccaa".replace("aa", "dd");那么结果应该会是ddbbccdd这样。 0 0 0 桃花长相依 String s="123456(sss)";String substring = s.substring(s.indexOf("("), s.indexOf(")")+1);//replace(替换前内容...