String Equals vs == Operator Example in Java

2 min read Updated May 29, 2026

Introduction

Comparing strings is one of the most common tasks in Java, but beginners often confuse the == operator with the equals() method. This program demonstrates both and explains when each is appropriate.

Key Difference

Operator / Method	Compares
`==`	Whether two references point to the same object in memory
`equals()`	Whether two strings have the same character sequence
`equalsIgnoreCase()`	Same as `equals()` but ignores letter case

Example Program

java

public class StringCompareDemo {
    public static void main(String[] args) {
        String a = new String("Java");
        String b = new String("Java");
        String c = "Java";
        String d = "Java";

        System.out.println("a == b        : " + (a == b));
        System.out.println("a.equals(b)   : " + a.equals(b));
        System.out.println("c == d        : " + (c == d));
        System.out.println("c.equals(d)   : " + c.equals(d));

        String s1 = "hello";
        String s2 = "HELLO";
        System.out.println("s1.equals(s2)            : " + s1.equals(s2));
        System.out.println("s1.equalsIgnoreCase(s2)  : " + s1.equalsIgnoreCase(s2));
    }
}

Sample Output

plaintext

a == b        : false
a.equals(b)   : true
c == d        : true
c.equals(d)   : true
s1.equals(s2)            : false
s1.equalsIgnoreCase(s2)  : true

How It Works

new String("Java") creates distinct objects on the heap, so a == b is false even though the text matches.
String literals "Java" are interned in the string pool; c and d refer to the same pooled object, so c == d is true.
For content comparison, always prefer equals() or equalsIgnoreCase().

Best Practices

Common Mistakes

Frequently Asked Questions

Does == compare string characters in Java?

No. == compares object references (memory addresses). Two String variables can point to different objects with the same text, so == may return false even when the content matches.

When should I use equalsIgnoreCase()?

Use equalsIgnoreCase() when comparing user input or case-insensitive identifiers such as command names or email domains.