publicclassMain{publicstaticvoidmain(String[]args){Stringstr="hello world";chartarget='o';intsecondOccurrence=StringUtil.getSecondOccurrence(str,target);if(secondOccurrence!=-1){System.out.println("Character '"+target+"' second occurrence is at index "+secondOccurrence);}else{System.out.println(...
int indexOf(int ch): It returns the index within this string of the first occurrence of the specified character. int indexOf(int ch):它返回指定字符首次出现在此字符串中的索引。 int indexOf(String str, int fromIndex): It returns the index within this string of the first occurrence of the ...
The character'a'occurs multiple times in the"Learn Java"string. TheindexOf()method returns the index of the first occurrence of'a'(which is 2). If the empty string is passed,indexOf()returns 0 (found at the first position. It is because the empty string is a subset of every substring...
Manipulating Characters in a StringThe String class has a number of methods for examining the contents of strings, finding characters or substrings within a string, changing case, and other tasks. Getting Characters and Substrings by Index You can get the character at a particular index within ...
String letters = "abcdefghijklabcdefghijkl"; /*这里讲讲阅读源代码,control点击进入方法*/ System.out.println("'c'在第" + letters.indexOf('c') + "个"); /* indexOf(int ch, int fromIndex) Returns the index within this string of the first occurrence of the specified character, starting ...
Returns the character (Unicode code point) at the specified index. 返回指定位置的字符( 以unicode的形式返回 ),示例如下: public class TestString6 { public static void main(String[] args) { String s = "https://my.oschina.net/lujiapeng" ; ...
Finding a Character in a String TheindexOf()method returns theindex(the position) of the first occurrence of a specified text in a string (including whitespace): Example Stringtxt="Please locate where 'locate' occurs!";System.out.println(txt.indexOf("locate"));// Outputs 7 ...
int indexOf(String str):返回特定String中字符串str的索引。 int indexOf(String str, int fromIndex):返回给定字符串中指定索引fromIndex后,字符串str的索引。 如果在特定String中找不到指定的char/substring,则上述所有函数都返回 -1。 JavaString indexOf()方法示例 ...
String(char[] value) Allocates a new String so that it represents the sequence of characters currently contained in the character array argument. String(char[] value, int offset, int count) Allocates a new String that contains characters from a subarray of the character array argument....
The second method accepts theStringtypes. It searches the string for the specifiedtargetsubstring and replaces each occurrence with thereplacement. 2. Replace All Occurrences of a Character The following Java program replaces all occurrences of the letter ‘o’ (lower case) with the letter ‘O’...