== is used to compare the number type data types viz. int, float,double  and also the boolean datatypes.

e.g. int x=10;

if(x==10)

{

// your code

}

boolean flag = true;

if(flag==false)

{

// Action1

}

if(flag==ture)

{

//Action2

}

.equals() method is used to compare the String data types

viz.

String str = "Hello";

if(str.equals("Hello"))

{

// Your code of action

}