Object Superclass

public class S {
    private String x;
    public S(String x) { this.x = x; }
    public boolean equals(Object o) {
        if (!(o instanceof S)) return false;
        return ((S) o).x.equals(this.x);
    }
}
// ...
S a = new S("hi");
S b = new S("hi");
System.out.println(a.equals(b) + " " + b.equals(a));

• A

  true true

  check_circle
• B

  true false

• C

  false true

• D

  false false