Java: Get the character (Unicode code point) before the specified index within the String

Last update on May 21 2025 12:49:33 (UTC/GMT +8 hours)

3. Get Unicode Code Point Before Index

Write a Java program to get the character (Unicode code point) before the specified index within the string.

Sample Solution:

Java Code:

// Define a public class named Exercise3.
public class Exercise3 {
    // Define the main method.
    public static void main(String[] args) {
  
        // Declare and initialize a string variable "str" with the value "w3resource.com".
        String str = "w3resource.com";
        // Print the original string.
        System.out.println("Original String : " + str);
        
        // Retrieve the Unicode code point before the character at index 1 in the string.
        int val1 = str.codePointBefore(1);
    
        // Retrieve the Unicode code point before the character at index 9 in the string.
        int val2 = str.codePointBefore(9);
        
        // Print the Unicode code point representing the character before index 1 in the string.
        System.out.println("Character(unicode point) = " + val1);
        // Print the Unicode code point representing the character before index 9 in the string.
        System.out.println("Character(unicode point) = " + val2);
    }
}

Sample Output:

Original String : w3resource.com                                                                              
Character(unicode point) = 119                                                                                
Character(unicode point) = 99

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to display the Unicode code point of the character immediately before a given index, with error handling for index 0.
• Write a Java program that, for a given index, prints both the Unicode code point at that index and the one immediately before it.
• Write a Java program to extract the Unicode code point before a specified index and then perform a bitwise operation on it.
• Write a Java program to compare the Unicode code points of the characters before two distinct indices in the same string.

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