Java String Pad Right rightPad(String s, int minLength)

Description

Pads the string at the right with spaces until it reaches the desired length.

License

Open Source License

Parameter

Parameter	Description
s	the string that will be padded.
minLength	the length to reach.

Declaration

public static String rightPad(String s, int minLength) 

Method Source Code

//package com.java2s;

public class Main {
    /**/*from w w w  . jav a  2s  .c om*/
     * Pads the string at the right with spaces until it reaches the desired
     * length. If the string is longer than this length, then it returns the
     * unchanged string. 
     * 
     * @param s the string that will be padded.
     * @param minLength the length to reach.
     */
    public static String rightPad(String s, int minLength) {
        return rightPad(s, minLength, ' ');
    }

    /**
     * Pads the string at the right with the specified character until it
     * reaches the desired length. If the string is longer than this length,
     * then it returns the unchanged string.
     * 
     * @param s the string that will be padded.
     * @param minLength the length to reach.
     * @param filling the filling pattern.
     */
    public static String rightPad(String s, int minLength, char filling) {
        int ln = s.length();
        if (minLength <= ln) {
            return s;
        }

        StringBuffer res = new StringBuffer(minLength);

        res.append(s);

        int dif = minLength - ln;
        for (int i = 0; i < dif; i++) {
            res.append(filling);
        }

        return res.toString();
    }

    /**
     * Pads the string at the right with a filling pattern until it reaches the
     * desired length. If the string is longer than this length, then it returns
     * the unchanged string. For example: <code>rightPad('ABC', 9, '1234')</code>
     * returns <code>"ABC412341"</code>. Note that the filling pattern is
     * started as if you overlay <code>"123412341"</code> with the left-aligned
     * <code>"ABC"</code>, so it starts with <code>"4"</code>.
     * 
     * @param s the string that will be padded.
     * @param minLength the length to reach.
     * @param filling the filling pattern. Must be at least 1 characters long.
     *     Can't be <code>null</code>.
     */
    public static String rightPad(String s, int minLength, String filling) {
        int ln = s.length();
        if (minLength <= ln) {
            return s;
        }

        StringBuffer res = new StringBuffer(minLength);

        res.append(s);

        int dif = minLength - ln;
        int fln = filling.length();
        if (fln == 0) {
            throw new IllegalArgumentException("The \"filling\" argument can't be 0 length string.");
        }
        int start = ln % fln;
        int end = fln - start <= dif ? fln : start + dif;
        for (int i = start; i < end; i++) {
            res.append(filling.charAt(i));
        }
        dif -= end - start;
        int cnt = dif / fln;
        for (int i = 0; i < cnt; i++) {
            res.append(filling);
        }
        cnt = dif % fln;
        for (int i = 0; i < cnt; i++) {
            res.append(filling.charAt(i));
        }

        return res.toString();
    }
}

Related

1. rightPad(String originalText, int length, char fillChar)
2. rightPad(String ret, int limit)
3. rightPad(String s, int length)
4. rightPad(String s, int length)
5. rightPad(String s, int length)
6. rightPad(String s, int minLength, char filling)
7. rightPad(String s, int n)
8. rightPad(String s, int width)
9. rightPad(String s, int z)