== and .equals difference?

Question

Sololearn told me to use == to test if something was equal to something. But a error happened so I asked chatgpt and it said I should use .equals? If(variable == (1)) is wrong! It was, if(variable.equals (1))

Answer 1

== checks the equality of a reference in memory; equals() checks the equality of values.

provide the complete code and task instruction.

Answer 2

Be careful, if the variable is of type Object, such as String or Integer, then equals() is recommended.

// try
Integer x,y;

x=128; y=128;
System.out.println(x == y);

x=127; y=127;
System.out.println(x == y);

Answer 3

== compares the memory address
.equals() compares its content

For example, assume the user enters "a" as input
```
Scanner sc = new Scanner(System.in);
String userInput = sc.nextLine();

if (userInput == "a"){
System.out.println("Doesn't print anything because this compares the addresses");
}

if (userInput.equals("a"){
System.out.println("This prints because the contents are being compared and both are equal");
}
```