Reference class without importing : import « Java Source And Data Type « SCJP

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SCJP » Java Source And Data Type » import 
1.4.4.Reference class without importing
public class MainClass{
   java.util.Vector vec = new java.util.Vector();
}
1.4.import
1.4.1.You may import either an individual class from a package or the entire package.
1.4.2.White space and comments may appear before or after any of these elements.
1.4.3.To use classes with the same name in two different packages
1.4.4.Reference class without importing
1.4.5.Reference class with importing
1.4.6.Java compiler automatically imports all the classes in the java.lang package into every source file.
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