Java: Get the canonical representation of the string object

Last update on May 21 2025 12:50:45 (UTC/GMT +8 hours)

20. Get Canonical Representation

Write a Java program to get the Canonical representation of the string object.

Sample Solution:

Java Code:

// Define a public class named Exercise20.
public class Exercise20 {
    // Define the main method.
    public static void main(String[] args) {
        // Create three strings in three different ways.
        String str1 = "Java Exercises"; // Creating a string using string literal
        String str2 = new StringBuffer("Java").append(" Exercises").toString(); // Creating a string using StringBuffer and converting it to string
        String str3 = str2.intern(); // Creating a string by interning str2

        // Determine which strings are equivalent using the ==
        // operator (as compared to calling equals(), which is
        // a more expensive operation.
        System.out.println("str1 == str2? " + (str1 == str2)); // Checking if str1 and str2 reference the same object
        System.out.println("str1 == str3? " + (str1 == str3)); // Checking if str1 and str3 reference the same object
    }
}

Sample Output:

str1 == str2? false                                                                                           
str1 == str3? true

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to compare the canonical representations of two strings after normalization.
• Write a Java program to convert a string to its canonical form and check equality with another string.
• Write a Java program to demonstrate canonical representation by comparing interned and non-interned strings.
• Write a Java program to generate canonical representations of strings and sort them lexicographically.

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• Java String Exercises Home ↩
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