End while loop at end of string

Question

I want to end whileloop, regardless of the length. For python a (-1) is returned when the index exceeds the length of the string. But I can't find to work out how to do the same in java.

 while(true) {
        System.out.println("Letter nur " + (i+1) + " is " + name.charAt(i));
        if(name.charAt(i)==-1){
            break
        }
        i = i + 1;

Can I and if yes, how?

When iterating over a sequence of fixed length, use a for loop instead of a while loop. This is true for both Python and Java. — Code-Apprentice
– Code-Apprentice, Commented Jan 16, 2018 at 20:52
I don't see how you could get a -1 in Python. There is no charAt method on string, and indexing past the end would raise an exception. — Fred Larson
– Fred Larson, Commented Jan 16, 2018 at 20:55
@FredLarson Perhaps the OP is confused with slicing syntax where you can use -1 as an index? — Code-Apprentice
– Code-Apprentice, Commented Jan 16, 2018 at 20:57
@Code-Apprentice: Maybe, but that doesn't seem to relate well to this question. — Fred Larson
– Fred Larson, Commented Jan 16, 2018 at 20:58

shmosel · Accepted Answer · 2018-01-16 20:53:33Z

2

Use a for loop:

for (int i = 0; i < name.length(); i++) {
    System.out.println("Letter nur " + (i+1) + " is " + name.charAt(i));
}

answered Jan 16, 2018 at 20:53

shmosel

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7 Comments

Code-Apprentice Over a year ago

Can you do for (char c : s) in Java? It has been too long since I wrote any Java code.

shmosel Over a year ago

@Code-Apprentice You can do for (char c : s.toCharArray()). But then you can't print i+1.

Fred Larson Over a year ago

You could also just put the test part of this if in the while. But I think range-for is the best idea.

parvelmarv Over a year ago

Thanks! I'm doing an exercise where I'm suppose to compare the time for while and for loops. But if i were to compare while(i < name.length() and for(int i = 0; i < name.length(); i++) wouldnt that be almost the same thing?

shmosel Over a year ago

@parvelmarv Yes. The for loop is just more conventional.

|

ASG · Accepted Answer · 2018-01-16 21:21:02Z

0

You can easily use length() function for this purpose. But according to question, you want to end while loop at the end of string. This can be done as follows:

    int i=0;
    while(true){
        try{
            System.out.print(""+as.charAt(i));
            i++;
        }
        catch(java.lang.StringIndexOutOfBoundsException e){
            break;
        }
    }

answered Jan 16, 2018 at 21:21

ASG

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