Java String Sub String substringBefore(String str, String separator)

Description

substring Before

License

Apache License

Declaration

public static String substringBefore(String str, String separator) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

public class Main {
    private static final String EMPTY = "";

    public static String substringBefore(String str, String separator) {
        if (isEmpty(str) || separator == null) {
            return str;
        }//from  w w  w. j a  v a  2 s  .  com
        if (separator.length() == 0) {
            return EMPTY;
        }
        int pos = str.indexOf(separator);
        if (pos == -1) {
            return str;
        }
        return str.substring(0, pos);
    }

    public static boolean isEmpty(String str) {
        return str == null || str.length() == 0;
    }

    public static String substring(String str, int start) {
        if (str == null) {
            return null;
        }

        // handle negatives, which means last n characters
        if (start < 0) {
            start = str.length() + start; // remember start is negative
        }

        if (start < 0) {
            start = 0;
        }
        if (start > str.length()) {
            return EMPTY;
        }

        return str.substring(start);
    }
}

Related

1. substringBefore(String input, String sub)
2. substringBefore(String s, char c)
3. substringBefore(String str, int endChar)
4. substringBefore(String str, String separator)
5. substringBefore(String str, String separator)
6. substringBefore(String string, String delimiter)
7. substringBefore(String text, String str)
8. substringBeforeChar(String str, int separator)
9. substringBeforeFirst(String string, String delimiter)