String being shortened suddenly

Question

I read a string from the user. Then, when I use the string, I see it's being shortened. I don't know how or why? I need the whole String, not just a part of it!

This is the code:

String exp=null;
System.out.println("Enter an expression without nested parenthesis");
try {
    exp=read.next();
    System.out.println("exp 1 : " + exp); 
}

An example run:

input: 13 + 45

The example output is:

exp 1 : 13

DevShark · Answer 1 · 2016-03-25T22:53:24.503

2

You need to read the whole line:

String exp = null;
System.out.println("Enter an expression without nested parenthesis");
try {
    exp = read.nextLine();
    System.out.println("exp 1 : "+exp);
}

read.next reads only until the first whitespace.

edited Mar 25 '16 at 22:53

answered Mar 25 '16 at 22:50

DevShark

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that really worked, but why did this problem happen?!, i always use the read.next(); and it always works!? – Duha Mar 25 '16 at 22:52
1

@Duha because `next()` only returns the text up to the next space in the input. – Louis Wasserman Mar 25 '16 at 22:53

score 0 · Answer 2 · answered Mar 25 '16 at 22:50

Using next() will only return what comes before a space

     String exp=null;
     System.out.println("Enter an expression without nested parenthesis");
     try {
        exp=read.nextLine(); //read line
        System.out.println("exp 1 : "+exp); 
     }

String being shortened suddenly

2 Answers2