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Confused in console please help

Rajat kumar jain

Joined: Dec 22, 2011
Posts: 25
Hello all please help me in one of my doubt

actually i was writing a program in which a program has to take 3 numbers from the user and if i will not enter the third number and just press enter key then it should multiply first two numbers else it should multiply all the three numbers and show the result.
Now the problem is that
i use following statement
DataInputStream dis=new DataInputStream(;
String r=dis.readLine();

now the problem is that if i dont write anything on the console and simply press enter then what would it consider it whether it will consider it as null string(r==null) or anything else as in the following code it always excecutes if statement please reply asap guys

Ankit Garg

Joined: Aug 03, 2008
Posts: 9327

Did you try add && r.length() > 0 to your if condition?

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It is sorta covered in the JavaRanch Style Guide.
subject: Confused in console please help