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Does reuse variable make program faster or save some memories?

807580Sep 1 2010 — edited Sep 11 2010
If I have code like: 
public void test(){
    Map m1 = new HashMap();
    ....
    Map m2 = new HashMap();
    ....
}
public void test(){
    Map m1 = new HashMap();
    ....
    m1 = new HashMap();
    ....
}
Does second code make program run slightly faster or save some memories?
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Locked on Oct 9 2010
Added on Sep 1 2010
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