Can we able to access the object in String pool which is does not not have any reference. Here is code :
String str ="abc";
str.toUpperCase();
System.out.println(str); // System.out.println(str.toUpperCase());
Output : abc
Here I am performing the toUpperCase() operation on str. In String pool one object will be created for this str.toUpperCase();. Can we able to access this object.? if yes how?
This is where java documentation is used .... Refer http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html#toUpperCase()
str.toUpperCase() returns a string converted to upper case, you have to assign it to another string variable or do a self assignment, so you can access it later.
toUppercase. Otherwise his question doesn’t make any sense. Feel free to provide a better answer if you disagree. I don’t see your answer yet.String str ="abc"; // 1
str.toUpperCase(); // 2
System.out.println(str); // 3
in above code
First line will create new Object of String with value "abc" and assign it to the reference variable str.
Second line will create the new Object of String because String class is immutable so original Object str will not change. but here we are not assigning the new object which is created in line 2 so it will be lost somewhere in Heap area.
That is why in line 3 printing value is "abc".
if you want to use the new Object created by str.toUpperCase() than have to assign that in a new reference variable.
or
alternative option is update the original String Object like this
str = str.toUpperCase();
but in above operation, the original Object str containing the value "abc" will be lost in the Heap area !!!!!
You can find details about working with String by example here.
str=str.toUpperCase();This has nothing to do with string pools.