String declaration in java [duplicate]

Question

What is the difference between these two string declarations?

String s1 = "tis is sample";
String s2 = new String ("tis is sample");

When I check s1==s2 it says false.

Why is it false?

Could you also explain the working behind these two declarations. I am so confused with it. Which one should I use to declare a String?

You should try searching existing questions first, there are many same answered questions. — Himanshu Bhardwaj
– Himanshu Bhardwaj, Commented Oct 1, 2017 at 4:48
Actually it appears to be a nested duplicate because that one was also marked duplicate — RSon1234
– RSon1234, Commented Oct 1, 2017 at 4:49
And try to write proper words with nice punctuation and grammar. — Ashvin Sharma
– Ashvin Sharma, Commented Oct 1, 2017 at 4:50

Am_I_Helpful · Accepted Answer · 2017-10-01 06:43:02Z

1

While string comparison, you have to use

if ( s1.equals(s2) ) {
  do something; 
}

not use ==

// These two have the same value
s1.equals(s2) // --> true 

// ... but they are not the same object
s1 == s2 // --> false 

// ... neither are these
new String("test") == new String("test") // --> false 

// ... but these are because literals are interned by 
// the compiler and thus refer to the same object
"tis is sample" == "tis is sample" // --> true 

// ... but you should really just call Objects.equals()
Objects.equals(s1, new String("tis is sample")) // --> true
Objects.equals(null, "tis is sample") // --> false

In addition you can check details from below code http://rextester.com/GUR44534

edited Oct 1, 2017 at 6:43

Am_I_Helpful

19.2k7 gold badges53 silver badges76 bronze badges

answered Oct 1, 2017 at 4:49

Dr. X

2,9402 gold badges18 silver badges37 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

String declaration in java [duplicate]

1 Answer 1

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Linked

Related