string charat

字符串charAt()方法 (String charAt() Method)

charAt() method is a String class method in Java, it is used to get the character from specified index from a given string.

charAt()方法是Java中的String類方法，用于從給定字符串的指定索引中獲取字符。

Syntax:

句法：

    char String.charAt(index);

It accepts an index and returns the characters from the specified position of the String.

它接受索引并從String的指定位置返回字符。

Note: If the index is out of range, the method returns "String index out of range" exception.

注意：如果索引超出范圍，則該方法將返回“字符串索引超出范圍”異常。

Example:

例：

    Input:
str = "includeHelp"
Function call:
str.charAt(0)
Output:
"i"

Code:

碼：

public class Main
{
public static void main(String[] args) {
String str = "includeHelp";
System.out.println("character at 0 index: " + str.charAt(0));
System.out.println("character at 1 index: " + str.charAt(1));
System.out.println("character at 2 index: " + str.charAt(2));
System.out.println("character at 3 index: " + str.charAt(3));
System.out.println("character at 4 index: " + str.charAt(4));
System.out.println("character at 5 index: " + str.charAt(5));
System.out.println("character at 6 index: " + str.charAt(6));
System.out.println("character at 7 index: " + str.charAt(7));
System.out.println("character at 8 index: " + str.charAt(8));
System.out.println("character at 9 index: " + str.charAt(9));
System.out.println("character at 10 index: " + str.charAt(10));
}
}

Output

輸出量

character at 0 index: i
character at 1 index: n
character at 2 index: c
character at 3 index: l
character at 4 index: u
character at 5 index: d
character at 6 index: e
character at 7 index: H
character at 8 index: e
character at 9 index: l
character at 10 index: p

翻譯自: https://www.includehelp.com/java/string-charAt-method-with-example.aspx

string charat