Strings - General Questions

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        String a = "hello";
        String b = "hello";
        System.out.println(a == b);
    }
}

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        String s = "  Hi  ";
        System.out.println("[" + s.trim() + "]");
    }
}

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        System.out.println("ha".repeat(3));
    }
}

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        StringBuilder sb = new StringBuilder("abc");
        sb.reverse().append("!");
        System.out.println(sb);
    }
}

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        System.out.println("apple".compareTo("banana") < 0);
    }
}