String Objects created

[dennis zined]

hello ranchers.
Is it correct to say there are two String objects created by this statement:
System.out.println("hello world".toUpperCase());

thanks.

[Vivek Nidhi]

Hello there
I think only One object is created. Used javap to conclude this
if am wrong please point out.
D:\javaprg>javap -c hi
Compiled from hi.java
public class hi extends java.lang.Object {
public hi();
public static void main(java.lang.String[]);
}
Method hi()
0 aload_0
1 invokespecial #1 <Method java.lang.Object()>
4 return
Method void main(java.lang.String[])
0 getstatic #2 <Field java.io.PrintStream out>
3 ldc #3 <String "hello world"> // Push Item from Constant Pool (The String is put in the Constant Pool)
5 invokevirtual #4 <Method java.lang.String toUpperCase()> // invoke the method to convert it to UpperCase
8 invokevirtual #5 <Method void println(java.lang.String)>
11 return
regs
Vivek Nidhi

[dennis zined]

thanks Vivek.

[Nathaniel Stoddard]

Um, well not to be a pain, but unless you're being very specific about your useage of the term "object" there are going to be 2 strings created.
The first will be "hello world" string placed in the constant string pool. After that, the toUpperCase method will return a separate string since strings are immutable.
So, 2 strings. Um, how many objects? Well, is a string placed in the constant memory pool an object? You did call toUpperCase on it, so I would venture to say that it is an object.
Of course, I didn't run across any questions on the exam that asked how many "string objects" are created by a segment of code. Only questions that just asked "how many strings".

[Vivek Nidhi]

Thanks for pointing out my mistake.
regs
Vivek Nidhi

[Nathaniel Stoddard]

My pleasure. String creation is one of the easier topics on the exam and a nice place to have the opportunity to pick up a few points without breaking a sweat.