Comparing String and Integer with equals

Question

The output of the below code is false

String str = \"3456\";
String str1 = \"3456\";
System.out.println(Integer.valueOf(str).equals(str1));
         


        

Answer 1

Usually, when implementing equals(), one of the first things to do is to check whether the objects are of one and the same type.

public boolean equals(Object obj) {
    if (!(obj instanceof SomeType)) return false;
    ...
}

This is also applied in the Integer and String classes, which answers the question why do you receive false as a result.