Add comments a bit to GettingCloserToTheTarget task. Change DTO to record class

Author: andrei-punko

src/main/java/by/andd3dfx/numeric/GettingCloserToTheTarget.java

@@ -32,14 +32,10 @@ public static boolean isPossibleToReachTheTarget(Condition condition) {
     }
 
     @Builder
-    public static class Condition {
+    public record Condition(double x0, double y0, double vx, double vy,
+                            double vRocket,
+                            double t, double distance
+    ) {
 
-        double x0;
-        double y0;
-        double vx;
-        double vy;
-        double vRocket;
-        double t;
-        double distance;
     }
 }

src/test/java/by/andd3dfx/numeric/GettingCloserToTheTargetTest.java

@@ -10,22 +10,22 @@ public class GettingCloserToTheTargetTest {
     @Test
     public void isPossibleToReachTheTarget() {
         Condition condition = Condition.builder()
-            .x0(1)
-            .y0(1)
+            .x0(1)  // 1 - 0.5*10 = 1-5 = -4
+            .y0(1)  // 1 + 0.5*10 = 1+5 = 6, hypotenuse: 4^2 + 6^2 = 52 = (7.xx)^2
             .vx(-0.5)
             .vy(0.5)
-            .vRocket(0.6)
+            .vRocket(0.6)   // need to compare: 6 and 7.2
             .t(10)
             .distance(1)
             .build();
         assertThat(GettingCloserToTheTarget.isPossibleToReachTheTarget(condition)).isFalse();
 
         Condition condition2 = Condition.builder()
-            .x0(1)
-            .y0(1)
+            .x0(1)  // 1 - 0.5*10 = 1-5 = -4
+            .y0(1)  // 1 + 0.5*10 = 1+5 = 6, hypotenuse: 4^2 + 6^2 = 52 = (7.xx)^2
             .vx(-0.5)
             .vy(0.5)
-            .vRocket(0.65)
+            .vRocket(0.65)   // need to compare: 6.5 and 7.2
             .t(10)
             .distance(1)
             .build();