publicclassStringExample{publicstaticvoidmain(String[]args){Stringstr="Hello, World!";chartargetChar='o';intfirstIndex=str.indexOf(targetChar);System.out.println("第一个 'o' 出现在: "+firstIndex);// 查找下一个 'o' 的位置if(firstIndex!=-1){intsecondIndex=str.indexOf(targetChar,firstInd...
publicclassMain{publicstaticvoidmain(String[]args){Stringstr="Hello World!";charch='o';intindex=str.indexOf(ch);if(index!=-1){System.out.println("Character '"+ch+"' first appears at index: "+index);}else{System.out.println("Character '"+ch+"' does not appear in the string.");}...
publicclassMain{publicstaticvoidmain(String args[]){ Stringstring="aaa456ac"; System.out.println(string.indexOf("b"));// -1,"b"不存在// 从第四个字符位置开始往后继续查找,包含当前位置System.out.println(string.indexOf("a",3));// 6//a-97,b-98,c-99System.out.println(string.indexOf(...
String str = "Hello world, hello Java!"; String subStr = "hello"; int firstIndex = str.indexOf(subStr); System.out.println("First occurrence of 'hello' is at index: " + firstIndex); int secondIndex = str.indexOf(subStr, firstIndex + 1); System.out.println("Second occurrence of '...
public class AdvancedIndexOfExample {public static void main(String[] args) {String originalString = "Java is a powerful programming language. Java is fun.";// 从前往后查找第一个出现的Javaint firstIndex = originalString.indexOf("Java");System.out.println("第一个出现的Java位置:" + firstIndex...
一、String基本操作方法 首先说一下基本操作方法,字符串的基本操作方法中包含以下几种: (1)获取字符串长度length() (2)获取字符串中的第i个字符charAt(i) (3)获取指定位置的字符方法getChars(4个参数) 1、 获取字符串长度方法length() 格式:int length = str.length(); ...
今天浏览了一下java里的String类,发现一个静态方法有点意思,就是我们常用的indexOf(String str)的底层实现,先看下代码调用链。 public int indexOf(String str) { return indexOf(str, 0); } public int indexOf(String str, int fromIndex) {
The arrival of Java Card Development Kit 24.1 The Java Card team is excited to announce the general availability of the Java Card Development Kit v24.1. This significant update improves the Oracle comprehensive stand-alone development environment, which includes tools, a simulator and a plugin, enab...
Java String、StringBuffer 和 StringBuilder 的区别 String String:字符串常量,字符串长度不可变。Java 中 String 是 immutable(不可变)的。 String 类的包含如下定义: /** The value is used for character storage. */privatefinalcharvalue[];/** The offset is the first index of the storage that is ...
String sourceStr="There is a string accessing example.";//获得字符串长度int len=sourceStr.length();//获得索引位置16的字符char ch=sourceStr.charAt(16);//查找字符和子字符串int firstChar1=sourceStr.indexOf('r');int lastChar1=sourceStr.lastIndexOf('r');int firstStr1=sourceStr.indexOf("...