strings

Java String Handling

Strings in Java are objects that represent sequences of characters. The String class provides various methods for string manipulation, such as concatenation, substring, and length.

String Concatenation

public class StringExample {
    public static void main(String[] args
    {
        String str1 = "Hello";
        String str2 = "World";
        
        // Concatenate strings
        String result = str1 + " " + str2;
        System.out.println("Concatenated String: " + result);
    }
}

In this example, the + operator is used to concatenate two strings str1 and str2.

String Length

public class StringExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        
        // Get the length of the string
        int length = str.length();
        System.out.println("Length of the string: " + length);
    }
}

The length() method returns the number of characters in the string, including spaces and punctuation.

Substring

public class StringExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        
        // Extract a substring
        String subStr = str.substring(7, 12);  // Extracts "World"
        System.out.println("Substring: " + subStr);
    }
}

The substring() method is used to extract a part of the string. In this example, it extracts the substring starting from index 7 to 12.