Java implements the method of changing the first letter of a string to uppercase

In Java, if you want to capitalize the initial letter of a string, you can use the substring and toUpperCase methods provided by the String class, or use the toUpperCase method of the Character class. Here are several implementation methods:

Method 1: Use substring and toUpperCase

public class Main {
    public static void main(String[] args) {
        String str = "hello world";
        String capitalized = (0, 1).toUpperCase() + (1);
        (capitalized); // Output: Hello world    }
}

Method 2: Use and StringBuilder

public class Main {
    public static void main(String[] args) {
        String str = "hello world";
        StringBuilder sb = new StringBuilder(str);
        (0, ((0)));
        String capitalized = ();
        (capitalized); // Output: Hello world    }
}

Method 3: Use the Apache Commons Lang library (if you can use external libraries)

First, make sure that the Apache Commons Lang library has been added to your project. Then, you can use the method:

import .;
public class Main {
    public static void main(String[] args) {
        String str = "hello world";
        String capitalized = (str);
        (capitalized); // Output: Hello world    }
}

Method 4: Use mapToUpper with Java 8 and above (only capitalization of the initial letter)

If you just want to make sure the initials of the entire string are capitalized and the other letters remain as they are (this may not be strictly "capsular" in some scenarios, but it is also a common requirement), you can use Java 8's streaming operations:

public class Main {
    public static void main(String[] args) {
        String str = "hello world";
        String capitalized = ((0)).toUpperCase() + (1);
        (capitalized); // Output: Hello world    }
}

This approach is actually similar to the first one, but it more explicitly shows that capitalizes only the first character. Which method to choose depends on your specific needs and preferences. If you only need initials, the first and fourth methods are the most straightforward. If you need more complex string operations, such as capitalizing the initials plus capitalizing of other words (for example, converting "hello world" to "Hello World"), then the second method or the Apache Commons Lang library method may be more appropriate.

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