new tasks

Task/Assertions/Java/assertions.java

@@ -0,0 +1,8 @@
+public static void main(String[] args){
+   int a;
+   //...input or change a here
+   assert a == 42;//throws an AssertionError when a is not 42
+   assert a == 42 : "Error message"; //throws an AssertionError
+          //when a is not 42 with "Error message" for the message
+          //the error message can be any non-void expression
+}