字符串 charat

String.charAt() function is a library function of String class, it is used to get/retrieve the specific character from a string. Where, the index starts from 0 and ends to String.lenght-1.

String.charAt()函數是String類的庫函數，用于從字符串中獲取/檢索特定字符。 其中，索引從0開始，到String.lenght-1結束。

For example, if there is string "Hello", its index will starts from 0 and end to 4.

例如，如果存在字符串“ Hello” ，則其索引將從0開始到4結束。

Note: If you try to access the character out of bounds, an exception StringIndexOutOfBoundsException will generate. So, be careful while using index in the string.

注意：如果您嘗試超出范圍訪問字符，則會生成異常StringIndexOutOfBoundsException 。 因此，在字符串中使用索引時要小心。

Example1:

范例1：

In this example, there is string initialized by "Hello world!" and we have to access its 0^th and 7^th character.

在此示例中，存在由“ Hello world！”初始化的字符串。 并且我們必須訪問其^第 0和^第 7 ^個字符。

public class Example1 {public static void main (String[] args) throws java.lang.Exception{String msg = "Hello world!";System.out.println("Character at 0th index: "+ msg.charAt(0));System.out.println("Character at 7th index: " + msg.charAt(7));} }

Output

輸出量

Character at 0th index: HCharacter at 7th index: o .minHeight{min-height: 250px;}@media (min-width: 1025px){.minHeight{min-height: 90px;}} .minHeight{min-height: 250px;}@media (min-width: 1025px){.minHeight{min-height: 90px;}}

Example2:

范例2：

In this example, we have to read a string and print it character by character

在此示例中，我們必須讀取字符串并逐個字符打印

import java.util.*;public class Example2 {public static void main (String[] args) throws java.lang.Exception{//string ObjectString msg = null;//Scanner class ObjectScanner scan = new Scanner(System.in);//input a stringSystem.out.println("Input a string: ");msg = scan.nextLine();//printing string character by characterSystem.out.println("Input string is: ");for(int loop =0; loop<msg.length(); loop++)System.out.print(msg.charAt(loop));} }

Output

輸出量

Input a string: I love programming.Input string is: I love programming.

翻譯自: https://www.includehelp.com/java/String-charAt-function-to-get-character-by-Index-from-string.aspx

字符串 charat

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