I'm studying about String in Java and I wonder, what is difference between:
String hello = "Hello Java";
System.out.println(hello);
and only use this:
System.out.println("Hello Java");
Are they the same ? Both go in string pool ? Thanks !
Second example:
if("dog" == "cat")
return true;
Are this literals stored in java memory ? If they are store what are the references?
String hello = "Hello Java";
"Hello Java" is the java literal. It's put into the String Poolhello is the java reference to the value from String PoolString hello = new String("Hello Java");
"Hello Java" is the java literal. It's put into the String Poolhello is the java reference to the Object from Hash that has a value from String PoolString helloNew = hello.intern(); put the string from hello to the String Pool, release new String("Hello Java") and retrieves a reference to the value from String Pool. System.out.println("Hello Java");
"Hello Java" is the java literal. It's put into the String PoolString hello = "Hello Java" or simple "Hello Java", every string literal goes to the String Pool.
"Hello Java" will be stored in the String Poll not depending on did you make a reference to it or not.
"dog" == "cat", keep in mind this is not how strings are compared, this is solely comparing the memory addresses of the two values. That said, they'll be different simply by being different strings. If you were to do "dog" == "dog", you'd get true, but "dog" == new String("dog") would return false.String hello = "Hello Java";
I think this String variable hello will be in the string pool.
System.out.println("Hello Java");
Here argument passed in the argument of println method will not be stored permanently. It will be stored temporarily inside println method only and then removed after the method call completes.
For indepth analysis, you can go through 1.
For second question, objects are stored on string pool
String one = new String("one"); String one2 = new String("one");is a possible memory leak and should bestatic final String ONE = "one";.