How can one retrieve a specific character from a location in Java?

In Java, you can use the charAt() method to retrieve a character at a specified position. This method takes an integer parameter that indicates the position of the character to be retrieved, and it returns the character at that position.

Below is an example code to retrieve a specific character at a given position:

String str = "Hello, World!";
char ch = str.charAt(7);
System.out.println(ch);  // 输出结果为 'W'

In the above code, we first define a string variable named str. Then we use the charAt() method to retrieve the character at index 7 and assign it to the variable ch. Finally, printing ch will give us the character at the specified position.

It is important to note that the index of a string starts at 0, so when getting the first character, you need to use index 0. If the specified position is outside the range of the string’s length, a StringIndexOutOfBoundsException exception will be thrown. Therefore, before using the charAt() method to get a character, make sure the specified position is valid.

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