String constant pool and String comparision

StringTest.java

public class StringTest{

    String a = "a"; // String constant pool 
    String b = new String("a");  // heap
    a==b // not true becuase of different memory location based on the way they created
    a.equlas(b) // true
    
    //String b = "a"
    StringBuilder builder  = new StringBuilder();  // Extends the AbstractStringBuilder class - no thread saftey
    StringBuffer buffer = new StringBuffer(); // Extends the AbstractStringBuilder class but all the required methods are synchrnozed so its thread safe
    public static void main(String[] args) {

        StringTest stringTest = new StringTest();
        if(stringTest.a.equals(stringTest.b))
            System.out.println("true with equal");
        else if(stringTest.a == stringTest.b)
            System.out.println("true: with direct comparision ");
        else
            System.out.println("false");

    }
}