difference between equals and == in java

// == operator
String str1 = new String("Hello");
String str2 = new String("Hello");
System.out.println(str1 == str2); // output : false


// equals method
String str1 = new String("Hello");
String str2 = new String("Hello");
System.out.println(str1.equals(str2)); // output : true

In general both equals() and == operator in Java are used to compare 
objects to check equality but here are some of the differences between the two:

1) .equals() and == is that one is a method and other is operator.
2) We can use == operator for reference comparison (address comparison) 
and .equals() method for content comparison. 
 -> == checks if both objects point to the same memory location 
 -> .equals() evaluates to the comparison of values in the objects.
3) If a class does not override the equals method, then by default it 
uses equals(Object o) method of the closest parent class 
that has overridden this method.

// Java program to understand  
// the concept of == operator 
public class Test { 
    public static void main(String[] args) 
    { 
        String s1 = new String("HELLO"); 
        String s2 = new String("HELLO"); 
        System.out.println(s1 == s2); 
        System.out.println(s1.equals(s2)); 
    } 
} 
Output:
false
true
  
Explanation: Here we are creating two (String) objects namely s1 and s2.
Both s1 and s2 refers to different objects.
 -> When we use == operator for s1 and s2 comparison then the result is false 
 as both have different addresses in memory.
 -> Using equals, the result is true because its only comparing the 
 values given in s1 and s2.

/*
Difference between == and .equals() method in Java
In general both equals() and “==” operator in Java are used to compare objects to check equality but here are some of the differences between the two:

1) Main difference between .equals() method and == operator is that one is method and other is operator.
2) We can use == operators for reference comparison (address comparison) and .equals() method for content comparison. In simple words, == checks if both objects point to the same memory location whereas .equals() evaluates to the comparison of values in the objects.
3) If a class does not override the equals method, then by default it uses equals(Object o) method of the closest parent class that has overridden this method. See this for detail
Coding Example: */
// Java program to understand 
// the concept of == operator 
public class Test { 
	public static void main(String[] args) 
	{ 
		String s1 = new String("HELLO"); 
		String s2 = new String("HELLO"); 
		System.out.println(s1 == s2); 
		System.out.println(s1.equals(s2)); 
	} 
} 

// Output:

// false
// true