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static File[] listRoots(); 
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Java code:
File[] f=File.listRoots();
for(File ff:f){
System.out.println(ff.getAbsolutePath());
}

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Java code:

public static void main(String[] args)
{
try {
File[] root=File.listRoots();
for(int i=0;i<root.length;i++)
{
System.out.println(root[i]);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}


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Java code
File[] f=File.listRoots();
for(File ff:f){