Usage of touppercase( in java

toUpperCase() is used to convert a string to uppercase. 1. Syntax: public String toUpperCase() 2. Return value: Returns a new string, all characters are uppercase.

Usage of toUpperCase() in Java

toUpperCase() in Java Method used to convert all characters in a string to uppercase letters.

Syntax:

<code class="java">public String toUpperCase()</code>

Return value:

Returns a new string in which all characters are converted to uppercase letter. The original string remains unchanged.

Usage example:

<code class="java">String str = "Hello World!";
String uppercaseStr = str.toUpperCase();

System.out.println(uppercaseStr); // 输出：HELLO WORLD!</code>

Notes:

• toUpperCase() method The original string is not modified, but a new string is returned.
• This method only works with Unicode characters.
• If the string does not contain any alphabetic characters, this method will return the original string. The
• toUpperCase() method is the opposite of the toLowerCase() method, which converts all characters in the string to lowercase letters.

Code snippet example:

The following code snippet shows the usage of the toUpperCase() method:

<code class="java">import java.util.Scanner;

public class ToUpperCaseExample {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // 提示用户输入一个字符串
        System.out.println("Enter a string: ");
        String inputString = scanner.nextLine();

        // 将字符串转换为大写
        String uppercaseString = inputString.toUpperCase();

        // 打印出转换后的字符串
        System.out.println("Uppercase string: " + uppercaseString);
    }
}</code>

This code allows the user to enter a string, then converts it to uppercase and prints it.

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