Center a string by length - Java java.lang

Java examples for java.lang:String Format

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Description

Center a string by length

Demo Code


//package com.java2s;

public class Main {
    public static void main(String[] argv) {
        String str = "java2s.com";
        int size = 42;
        System.out.println(center(str, size));
    }// w w w .  ja va  2s . c o  m

    public static final String EMPTY_STRING = "";

    public static String center(String str, int size) {
        return center(str, size, ' ');
    }

    public static String center(String str, int size, char padChar) {
        if ((str == null) || (size <= 0)) {
            return str;
        }

        int strLen = str.length();
        int pads = size - strLen;

        if (pads <= 0) {
            return str;
        }

        str = alignRight(str, strLen + (pads / 2), padChar);
        str = alignLeft(str, size, padChar);
        return str;
    }

    public static String center(String str, int size, String padStr) {
        if ((str == null) || (size <= 0)) {
            return str;
        }

        if ((padStr == null) || (padStr.length() == 0)) {
            padStr = " ";
        }

        int strLen = str.length();
        int pads = size - strLen;

        if (pads <= 0) {
            return str;
        }

        str = alignRight(str, strLen + (pads / 2), padStr);
        str = alignLeft(str, size, padStr);
        return str;
    }

    public static String alignRight(String str, int size) {
        return alignRight(str, size, ' ');
    }

    public static String alignRight(String str, int size, char padChar) {
        if (str == null) {
            return null;
        }

        int pads = size - str.length();

        if (pads <= 0) {
            return str;
        }

        return alignRight(str, size, String.valueOf(padChar));
    }

    public static String alignRight(String str, int size, String padStr) {
        if (str == null) {
            return null;
        }

        if ((padStr == null) || (padStr.length() == 0)) {
            padStr = " ";
        }

        int padLen = padStr.length();
        int strLen = str.length();
        int pads = size - strLen;

        if (pads <= 0) {
            return str;
        }

        if (pads == padLen) {
            return padStr.concat(str);
        } else if (pads < padLen) {
            return padStr.substring(0, pads).concat(str);
        } else {
            char[] padding = new char[pads];
            char[] padChars = padStr.toCharArray();

            for (int i = 0; i < pads; i++) {
                padding[i] = padChars[i % padLen];
            }

            return new String(padding).concat(str);
        }
    }

    public static String alignLeft(String str, int size) {
        return alignLeft(str, size, ' ');
    }

    public static String alignLeft(String str, int size, char padChar) {
        if (str == null) {
            return null;
        }

        int pads = size - str.length();

        if (pads <= 0) {
            return str;
        }

        return alignLeft(str, size, String.valueOf(padChar));
    }

    public static String alignLeft(String str, int size, String padStr) {
        if (str == null) {
            return null;
        }

        if ((padStr == null) || (padStr.length() == 0)) {
            padStr = " ";
        }

        int padLen = padStr.length();
        int strLen = str.length();
        int pads = size - strLen;

        if (pads <= 0) {
            return str;
        }

        if (pads == padLen) {
            return str.concat(padStr);
        } else if (pads < padLen) {
            return str.concat(padStr.substring(0, pads));
        } else {
            char[] padding = new char[pads];
            char[] padChars = padStr.toCharArray();

            for (int i = 0; i < pads; i++) {
                padding[i] = padChars[i % padLen];
            }

            return str.concat(new String(padding));
        }
    }

    
}

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