Java OCA OCP Practice Question 1950

Question

What is the output of the following application? 

package mypkg; //from ww w .ja v  a  2s . c  o  m
import java.nio.file.*; 
public class Main { 
   public void m() { 
      Path p1 = Paths.get("mypkg/./p1/../m1.data")  
         .normalize(); 
      Path p2 = Paths.get("./mypkg/../p2/"); 
      p2 = p2.subpath(0, 2) 
            .resolve("m1.data") 
            .normalize(); 
      System.out.print(p1.equals(p2) 
            ? "Same!" : "Different!"); 
   } 
   public static void main(String... emerald) { 
      Main s = new Main(); 
      s.m(); 
   } 
}
  • A. Different!
  • B. Same!
  • C. The class does not compile.
  • D. The class compiles but throws an exception at runtime.


B.

Note

The program compiles and runs without issue, making Options C and D incorrect.

The first variable, p1, is created with normalize() being applied right away, leading to a value of mypkg/m1.data.

The second variable, p2, starts with a value of ./mypkg/../p2/.

The subpath() call reduces it to its first two components, ./mypkg.

The resolve() method then appends m1.data, resulting in a value of ./mypkg/m1.data.

Finally, normalize() further reduces the value to mypkg/m1.data.

Since this matches our first Path, the program prints Same!, and Option B is the correct answer.




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