Re: learning Java -- JAVA400-L

try:  if ( x.equals( y ) )...

On Sat, 15 Apr 2000 10:47:00 -0500, Joe Teff wrote:

>I have been spending a lot of time lately learning Java, but have run
>across a couple of things I don't understand. My background is RPG
>and I don't know C or C++.
>
>1. String x = "100"; String y = "100"; if (x == y) {};
>     In this case I thought x would not equal y since they refer to
>different
>     objects and different memory locations. The book says that they do
>     match because the compiler re-uses the same String object if it sees
>     the contents match. Is this true only for String objects or other
>objects
>     treated the same way? Is this true for only String objects in the same
>     class or does this optimization occur across classes?
>
> 2. String x = "abc"; String y = "abc"; x  += "def";
>     I assume that after the first two statements, both x and y point to the
>     same memory location. After the third statement, there are actually
>     two objects with different memory locations (x being "abcdef" and y
>     being "abc").
>
>Joe Teff
>
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