尝试将类集成到同一目录下“

reset

collaboration/jjcc.java

@@ -0,0 +1,26 @@
+
+public class jjcc {
+    public static void main(String[] args)
+    {
+        System.out.println(add(1,2));
+        System.out.println(sub(1,2));
+        System.out.println(mul(1,2));
+        System.out.println(div(1,2));
+    }
+    public static double add(double a,double b)
+    {
+        return a+b;
+    }
+    public static double sub(double a,double b)
+    {
+        return a-b;
+    }
+    public static double mul(double a,double b)
+    {
+        return a*b;
+    }
+    public static double div(double a,double b)
+    {
+        return (double)a/b;
+    }
+}