Comparing two StringBuilders

Predict the outputMediumJava only

Main.java

public class Main {
    public static void main(String[] args) {
        StringBuilder a = new StringBuilder("abc");
        StringBuilder b = new StringBuilder("abc");
        System.out.println(a.equals(b));
        System.out.println(a.toString().equals(b.toString()));
        StringBuilder r = a.reverse();
        System.out.println(r);
        System.out.println(a);
        System.out.println(r == a);
    }
}

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