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Alexander Schott
8,318 PointsWhy first variable stored in res2, not in res1 at (7:09)?
As Craig cleared the screen and starts REPL again, the variables should be lost. He created a boolean variable res2 by using a method with return value and he doesnt explicit make one, so REPL overtakes this. Why is there no res1 created? I thought every variable is lost? Do you know what i mean? I am just curious, its not a conceptuel question.
2 Answers
Maciej Torbus
8,137 PointsHey Alexander!
Good thing that you are curious! Take a look at this example which I've just created on javarepl.com
http://oi61.tinypic.com/1e6lcn.jpg
It seems that the variables starts at res0, so in Craig's example the two ints ageOfBob (0) and ageOfMary(1) are res0 and res1 and that's why the boolean comes with res2.
And yes, all the variables were cleared and lost there. That's good point.
Hope it helps!
Craig Dennis
Treehouse TeacherIf you type :reset it will clear the variables. :clear just clears the screen, so will Ctrl+L
Also, don't pay too much attention to the variable names there, they are just part of the tool, in case you ever want to use them again.
Alexander Schott
8,318 PointsAlexander Schott
8,318 Pointsthank your for that fast reply! Ah so every variable gets internally also stored in res0-res... even if you declare the variable by names. But you cant access them by res0, for example if you created your first variable like String aStr = "something";.
Maciej Torbus
8,137 PointsMaciej Torbus
8,137 PointsThat sounds right. I'm not familiar with java-repl but notice that using res variables could teach you some bad practice. Notice in the example that "1 > 0" in normal case would give you an error because you should store it in some variable. Java REPL does that for you and creates res0. You can't access it, because you should name your variables. Good practice is writing: boolean check = 1 > 0;
In example you gave, you should always access your variable by using its name (aStr), remember those res are just for your help/learn
That's what I think I'm not sure I'm right all the way - never used Java REPL before