Equality Operator

What Is Equality Operator In Apex?

If a value of X equals Y, the expression evaluates to true otherwise the expression evaluates to false.

• User-defined types are compared by reference which means that the 2 objects are equal if they reference the same location in the memory.
• You can override this default comparison behaviour by equals() and hashcode() methods in your class to compare object values instead.

Note:

• Unlike java(==), in apex it compares object value equality not reference equality except for user-defined types..
• String comparison using(==) is case insensitive.
• ID comparison using == is case-sensitive.

main() 
{ 
Integer a[] = new Integer[5]; 
Integer b[] = new Integer[5]; 
for(Integer i=0; i<5; i++) 
a[i]=i+1; 
System.debug(a); 
System.debug(b); 
System.debug(a==b); 
}

Note:

• Arrays(==) performs a deep check of all the values before returning its result. Likewise for collection and built-in apex objects.
• The comparison of any two values can never result in null though X and Y can be literal null.
• SOQL and SOSL use ‘=’ for their equality operator not ‘==’.

What Is Exact Equality Operator(===)?

If X and Y reference the exact same location in memory, the expression evaluates to true otherwise false.

main()
{
FirstClass fc = new FirstClass();
FirstClass fc2 = new FirstClass();
System.debug(if(fc===fc2));
}

What Is Exact Inequality Operator(!==)?

If X and Y do not reference the exact same location in memory, the expression evaluates to true otherwise false.

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