String Equality: == vs .equals() and .equalsIgnoreCase()

Beginner12 min read•Updated: 2026-10-22

Study Materials

⚖️ String Equality: == vs .equals()

Introduction

The distinction between == and .equals() is the single most common mistake made by beginners in Java.

🆚 The Critical Distinction

Comparison	What It Compares
`==`	Memory Reference Identity: Checks if two variables point to the exact same memory address.
`.equals()`	Content Value: Checks if the characters inside both strings are identical.

1import java.util.Scanner;
2 
3public class StringComparisonDemo {
  public static void main(String[] args) {
      String predefinedPassword = "SecretPassWord";
6 
      Scanner scanner = new Scanner(System.in);
      System.out.print("Enter password: ");
      String enteredPassword = scanner.nextLine();
10 
      // ❌ WRONG: == compares heap memory references, NOT text!
      if (enteredPassword == predefinedPassword) {
          System.out.println("Never printed!");
      }
15 
      // ✅ CORRECT: .equals() compares character content
      if (enteredPassword.equals(predefinedPassword)) {
          System.out.println("Access Granted!");
      } else {
          System.out.println("Access Denied!");
      }
22 
      // Case-Insensitive Comparison:
      if (enteredPassword.equalsIgnoreCase("secretpassword")) {
          System.out.println("Password matched ignoring uppercase/lowercase.");
      }
27 
      scanner.close();
  }
30}

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Essential String Methods (substring, indexOf, replace, split, trim)

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String Creation, String Pool, and Immutability in Java	Essential String Methods (substring, indexOf, replace, split, trim)

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Essential String Methods (substring, indexOf, replace, split, trim)

String Equality: == vs .equals() and .equalsIgnoreCase()

Beginner12 min read•Updated: 2026-10-22

Study Materials

⚖️ String Equality: == vs .equals()

Introduction

The distinction between == and .equals() is the single most common mistake made by beginners in Java.

🆚 The Critical Distinction

Comparison	What It Compares
`==`	Memory Reference Identity: Checks if two variables point to the exact same memory address.
`.equals()`	Content Value: Checks if the characters inside both strings are identical.

1import java.util.Scanner;
2 
3public class StringComparisonDemo {
  public static void main(String[] args) {
      String predefinedPassword = "SecretPassWord";
6 
      Scanner scanner = new Scanner(System.in);
      System.out.print("Enter password: ");
      String enteredPassword = scanner.nextLine();
10 
      // ❌ WRONG: == compares heap memory references, NOT text!
      if (enteredPassword == predefinedPassword) {
          System.out.println("Never printed!");
      }
15 
      // ✅ CORRECT: .equals() compares character content
      if (enteredPassword.equals(predefinedPassword)) {
          System.out.println("Access Granted!");
      } else {
          System.out.println("Access Denied!");
      }
22 
      // Case-Insensitive Comparison:
      if (enteredPassword.equalsIgnoreCase("secretpassword")) {
          System.out.println("Password matched ignoring uppercase/lowercase.");
      }
27 
      scanner.close();
  }
30}

Next Lesson

Essential String Methods (substring, indexOf, replace, split, trim)

Continue learning with hands-on practice, examples, and exercises in the upcoming topic.

Related Lessons

Previous Lesson	Next Lesson
String Creation, String Pool, and Immutability in Java	Essential String Methods (substring, indexOf, replace, split, trim)

Practice Quiz

Test your understanding of this lesson with 1 questions. Each question has one correct answer.

Previous Next