error related to array index

Question

Below code has variable "name". This may contain first and last name or only first name. This code checks if there is any white space in variable "name". If space exists, then it splits.

However, I am getting the "Error : Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1 at Space.main(Space.java:9)" during below cases

• If there is a white space before "Richard"
• If there is a white space after "Richard" without second word or second string.
• If I have two spaces after "Richard" then it will not save the name in lname variable.

How to resolve this error.

public class Space {
    public static void main(String[] args) {
    String name = "Richard  rinse ";
    if(name.indexOf(' ') >= 0) {
        String[] temp;
        temp = name.split(" ");
        String fname = temp[0];
        String lname = temp[1];
        System.out.println(fname);
        System.out.println(lname);
    } else {
        System.out.println("Space does not exists");}
    }
}

Answer 1

你必须像这样使用“\\ s”拆分字符串

name.split("\\s+");

Answer 2

If there are two spaces temp[1] will be empty, given "Richard rinse" the array is split this way

1 Richard

2

3 rinse

You should trim() the string and do something like

while(name.contains("  "))
    name=name.replace("  "," ");

Answer 3

String[] parts = name.trim().split("\\s+");

if (parts.length == 2) {
    // print names out
} else {
    // either less than 2 names or more than 2 names
}

trim removes leading and trailing whitespace as this lead to either leading or trailing empty strings in the array

the token to split on is a regular expression meaning any series of characters made up of one or more whitespace characters (space, tabs, etc...).

Answer 4

Maybe that way:

public class Space {
    public static void main(String[] args) {
        String name = "Richard  rinse ";
        String tname = name.trim().replace("/(\\s\\s+)/g", " ");
        String[] temp;
        temp = name.split(" ");
        String fname = (temp.length > 0) ? temp[0] : null;
        String lname = (temp.length > 1) ? temp[1] : null;
        if (fname != null) System.out.println(fname);
        if (lname != null) System.out.println(lname);
    } else {
        System.out.println("Space does not exists");
    }
}

Answer 5

To trim the white spaces, use this.

public String trimSpaces(String s){
    String str = "";
    boolean spacesOmitted = false;
    for (int i=0; i<s.length; i++){
        char ch = s.chatAt(i);
        if (ch!=' '){
            spacesOmitted = true;
        }
        if (spacesOmitted){
            str+=ch;
        }
    }
    return str;
}

Then use the trimmed string in the place of name.