classMain{publicstaticvoidmain(String[] args){ String str1 ="java is fun";// extractsubstringfrom index 0 to 3System.out.println(str1.substring(0,4)); } }// Output: java 用法: 用法: string.substring(intstartIndex,
Example 1: Java substring() With Only Start Index classMain{publicstaticvoidmain(String[] args){ String str1 ="program";// 1st character to the last character System.out.println(str1.substring(0));// program // 4th character to the last characterSystem.out.println(str1.substring(3));/...
int indexOf(String str): It returns the index within this string of the first occurrence of the specified substring. int indexOf(String str):它返回指定子字符串首次出现在此字符串中的索引。 int indexOf(int ch, int fromIndex): It returns the index within this string of the first occurrence ...
String class in Java provides convenient method to see if a character or sub-string or a pattern exists in current String object. You can useindexOf()which will return position of character or String, if that exist in current String object or -1 if character doesn't exists in String.last...
string的s.chatAt(index) java.lang.String.charAt() 方法返回指定索引处的char值。 索引范围是从0到length() - 1。 对于数组索引,序列的第一个char值是在索引为0,索引1,依此类推。 以下是声明java.lang.String.charAt()方法 public char charAt(int index)...
IndexOutOfBoundsException- 如果索引参数为负数或不小于该字符串的长度。 示例 下面的例子展示了 java.lang.String.charAt() 方法的用法。 package com.tutorialspoint; import java.lang.*; public class StringDemo { public static void main(String[] args) { String str = "This is tutorialspoint"; // pr...
1. indexOf的参数是 String, startIndex: Number; indexOf的返回值为int, 2. Function indexOf 包含如下几个格式: 1). Strng.indexOf(substring) //搜索String中的substring,默认从0位开始; 2). String.indexOf(substring, int m) //搜索String中的substring, 默认从第m位开始; ...
Java String lastIndexOf Method - Learn how to use the lastIndexOf method in Java, which returns the index of the last occurrence of a specified character or substring within a string.
importjava.util.*;publicclassStringMethodExample{publicstaticvoidmain(Stringargs[]){Stringstr="w3resource";// index numbering starts form zero// 1st overloaded methodintx=str.lastIndexOf('s');System.out.println();System.out.println("s index position in str from last position: "+x);// 2nd...
Python中的字符串类型是"不可变"数据(immutable),即创建之后就不能修改 (同Java中的String一样). 因此我们在对字符串进行连接的时候往往创建了新的字符串. 例如 ('hello' + 'there') 使用hello、there创建了一个新的字符串hellothere. string中的字符可以使用标准[]进行访问, 同Java一样,python使用零开头的索...