Question

Why String.equls() returns true but Stringbuilder.equals() returns false?

    StringBuffer sb1 = new StringBuffer("Amit");
    StringBuffer sb2= new StringBuffer("Amit");
    String ss1 = "Amit";
    String ss2 = "Amit";

System.out.println(sb1.equals(sb2)); //returns false
System.out.println(ss1.equals(ss2)); //returns true

Thx

Answer 1

StringBuffer does not override Object’s equals() method, and thus, it returns true only when a StringBuffer object is compared with itself.

public boolean equals(Object obj) {
    return (this == obj);
}

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To compare two StringBuffers based on their contents, do something like this:

sb1.toString().equals(sb2.toString());