Multiline paste in jshell

Question

I was trying out jshell and couldn't find option to paste multiple line expressions. Is it even possible to paste multiple lines in jshell. Similar to what scala offers with paste mode.

Answer 1

So if you have code like this:

 int c = 2;
 int j = 4;
 int x = 5; 

Copy and paste into jshell, only the first two statements are processed.

But if you have code like this:

  int c = 2; int j = 4; int x = 5;

And paste into jshell:

jshell> int c = 2; int j = 4; int x = 5;
        c ==> 2
        j ==> 4
        x ==> 5 

Even more lines of code like this:

HashMap<Integer, Integer> map2 = new HashMap<>(); for (int i = 0; i < 15; ++i) { map2.put(i, i);map2.put(i, i); } System.out.println(map2);

will actually work.

Why? Me don't know.

The only way I know that copy/paste will work is via (type it in jshell) :

/edit

and you can paste as much as you want.

Answer 2

Just in case people still end up here, a small tweak to paste in an entire code block to jshell is to wrap it around with braces {} as:

{
 int c = 2;
 int j = 4;
 int x = 5; 
 // access these only in this scope though
 System.out.println("c : " + c + ", j : " + j + ", x = " + x);
}

Sample screen: