small changes

.gitignore

@@ -14,7 +14,7 @@ local.properties
 .settings/
 .loadpath
 .recommenders
-
+META-INF/
 # External tool builders
 .externalToolBuilders/
 
@@ -122,3 +122,4 @@ https://github.com/joeblau/gitignore.io/issues/360
 .idea/
 *.iml
 # End of https://www.gitignore.io/api/eclipse,intellij+all
+out/

src/Main.java

@@ -1,6 +1,21 @@
+import java.io.Console;
+
 public class Main {
 
     public static void main(String[] args) {
         System.out.println("Hello World!");
+        Console console = System.console();
+        double input = Double.parseDouble(console.readLine("Enter your %d (th) passport number: ", 2));
+        System.out.println(input);
+        System.out.println((int)input);
+    }
+
+    private static int minRadius = 50;
+    private static double radius;
+    public static void setRadius(double radius2) {
+        if (radius2 < minRadius) {
+            throw new IllegalArgumentException("Radius is smaller than " + minRadius);
+        }
+        radius = radius2;
     }
 }

src/Worm.java

@@ -10,7 +10,7 @@ public class Worm {
 
     // shape
     private double radius;
-    private double minRadius;
+    private final double minRadius;
     // mass
     private double mass;
 
@@ -104,7 +104,7 @@ public class Worm {
 
     public void setRadius(double radius) {
         if (radius < this.minRadius) {
-            throw new IllegalArgumentException();
+            throw new IllegalArgumentException("Radius is smaller than " + this.minRadius);
         }
         this.radius = radius;
         setMass(radius);
@@ -114,10 +114,6 @@ public class Worm {
         return this.minRadius;
     }
 
-    public void setMinRadius(double minRadius) {
-        this.minRadius = minRadius;
-    }
-
     public double getMass() {
         return this.mass;
     }