Align string to left by length - Java java.lang

Java examples for java.lang:String Format

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Description

Align string to left 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(alignLeft(str, size));
    }/*from   w w w . ja  v a  2  s. c  om*/

    public static final String EMPTY_STRING = "";

    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));
        }
    }

    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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