replace substring only Once - Java java.lang

Java examples for java.lang:String Replace

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Description

replace substring only Once

Demo Code


//package com.java2s;

public class Main {
    public static void main(String[] argv) {
        String text = "java2s.com";
        String repl = "o";
        String with = "O";
        System.out.println(replaceOnce(text, repl, with));
    }/*ww w .j  a  va2 s.  c  o m*/

    public static final String EMPTY_STRING = "";

    public static String replaceOnce(String text, String repl, String with) {
        return replace(text, repl, with, 1);
    }

    public static String replace(String text, String repl, String with) {
        return replace(text, repl, with, -1);
    }

    public static String replace(String text, String repl, String with,
            int max) {
        if ((text == null) || (repl == null) || (with == null)
                || (repl.length() == 0) || (max == 0)) {
            return text;
        }

        StringBuffer buf = new StringBuffer(text.length());
        int start = 0;
        int end = 0;

        while ((end = text.indexOf(repl, start)) != -1) {
            buf.append(text.substring(start, end)).append(with);
            start = end + repl.length();

            if (--max == 0) {
                break;
            }
        }

        buf.append(text.substring(start));
        return buf.toString();
    }

    public static int indexOf(String str, char searchChar) {
        if ((str == null) || (str.length() == 0)) {
            return -1;
        }

        return str.indexOf(searchChar);
    }

    public static int indexOf(String str, char searchChar, int startPos) {
        if ((str == null) || (str.length() == 0)) {
            return -1;
        }

        return str.indexOf(searchChar, startPos);
    }

    public static int indexOf(String str, String searchStr) {
        if ((str == null) || (searchStr == null)) {
            return -1;
        }

        return str.indexOf(searchStr);
    }

    public static int indexOf(String str, String searchStr, int startPos) {
        if ((str == null) || (searchStr == null)) {
            return -1;
        }

        // JDK1.3????????bug?????????????????
        if ((searchStr.length() == 0) && (startPos >= str.length())) {
            return str.length();
        }

        return str.indexOf(searchStr, startPos);
    }

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

        if (start < 0) {
            start = str.length() + start;
        }

        if (start < 0) {
            start = 0;
        }

        if (start > str.length()) {
            return EMPTY_STRING;
        }

        return str.substring(start);
    }

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

        if (end < 0) {
            end = str.length() + end;
        }

        if (start < 0) {
            start = str.length() + start;
        }

        if (end > str.length()) {
            end = str.length();
        }

        if (start > end) {
            return EMPTY_STRING;
        }

        if (start < 0) {
            start = 0;
        }

        if (end < 0) {
            end = 0;
        }

        return str.substring(start, end);
    }
}

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