[JAVA3D] [Java3D] Strange result in test code

[오승우\(Sengwoo Oh\)]

Hi,   I wanted to test Java3D Vector operation, but I found the strange thing in my code.   In following code, the first part is the same as the second part, so 'for''s computing time would be the same as the second 'for''s.   but the result is different as following.   I don't know why.    ok test 0's duration : 3968.0 test 1's duration : 1782.0 test 0's duration : 3937.0 test 1's duration : 1750.0  ok test 0's duration : 1734.0 test 1's duration : 1735.0 test 0's duration : 1812.0 test 1's duration : 1719.0   //////////////////   public void Test0()     {         double d0,d1;         double t0,t1,t2;         float a;                 // test defined variable         Vector3f v0 = new Vector3f(1.0f,2.0f,3.0f);         Vector3f v1 = new Vector3f(3.0f,2.0f,1.0f);         float[] f0 = new float[3];         float[] f1 = new float[3];                 f0[0] = 1.0f; f0[1] = 2.0f; f0[2] = 3.0f;         f1[0] = 3.0f; f1[1] = 2.0f; f1[2] = 1.0f;                 //         int j;         long i;                 System.out.println(" ok ");         for(j=0;j<2;j++)         {             t0 = System.currentTimeMillis();             // first test             for(i=0;i<100000000;i++)             {                 a = v0.dot(v1);             }             //             t1 = System.currentTimeMillis();             // second test             for(i=0;i<100000000;i++)             {                  a = v0.dot(v1);             }             //             t2 = System.currentTimeMillis();                         System.out.println("test 0's duration : "+ (t1-t0));             System.out.println("test 1's duration : "+ (t2-t1));         } // for j                 System.out.println(" ok ");                 for(j=0;j<2;j++)         {             t0 = System.currentTimeMillis();             // first test             for(i=0;i<100000000;i++)             {                 a = v0.dot(v1);             }             //             t1 = System.currentTimeMillis();             // second test             for(i=0;i<100000000;i++)             {                  a = v0.dot(v1);             }             //             t2 = System.currentTimeMillis();                         System.out.println("test 0's duration : "+ (t1-t0));             System.out.println("test 1's duration : "+ (t2-t1));         } // for j     }