How to compare Strings in Java tutorial | String pool in Java |Why we don't use == to compare String
ASSALAM o alaikum
Code:
/*
真主
穆罕默德 真主啊，为我们的大师穆罕默德和他的家人祈祷与和平 77 85 72 65 77 77 65 68 32
83 104 97 104 122 97 105 98
*/
public class StringsComparison
{
public static void main(String[] args)
{
/*
== operator compares the objects (references) of Strings. If the reference is same
it says true else false. It doesn't compare the values of Strings
Syntax:
String a==String b
*/
System.out.println("\n Using == and same object refernece : ");
String firstString="12"; ////////////// an object of String class with name "firstString" and value "12"
String secondString="12"; ///////////// same object of String class with new name "secondString" and value "12"
/// (new object didnt formed) as JVM checked that "12" value has an object in strings pool so it reused that object
if(firstString==secondString)
{
System.out.println("Both are same");
}
else
{
System.out.println("Both are different");
}
System.out.println("\n Using == and different object referneces : ");
String thirdString="12"; ///////////// an object of String class with name "thirdString" and value "12"
String fourthString= new String("12"); //////////// now a new object is formed as we specifically wrote "new String"
////////////// Both objects are now different one with name "thirdString" and one with "fourthString"
if(thirdString==fourthString) ///// It will always be false as now objects are different no matter values are same as == compares the objects
{
System.out.println("Both are same");
}
else
{
System.out.println("Both are different");
}
//// ------------------------------------------------------------------------------------------------------------///////
//// ------------------------------------------------------------------------------------------------------------///////
System.out.println("\n Using .equals() and different object referneces : ");
/*
.equals() operator/method compares the values of Strings. If the values are same
it says true else false.
Syntax:
String a.equals(String b)
*/
String fifthString="12"; /// an object of String class with name "fifthString" and value "12"
String sixthString=new String("12");//////////// now a new object is formed as we specifically wrote "new String"
////////////// Both objects are now different one with name "fifthString" and one with "sixthString"
if(fifthString.equals(sixthString)) ///// It will true as both objects have same values and .equals() compares Strings values
{
System.out.println("Both are same");
}
else
{
System.out.println("Both are different");
}
}
}
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