Java String Left left(String str, int length)

Description

left of string

License

Apache License

Parameter

Parameter	Description
str	a parameter
length	a parameter

Declaration

public static String left(String str, int length) 

Method Source Code

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

public class Main {
    /**/*from   w w  w .j  av  a 2 s  . c om*/
     * left of string 
     * @param str
     * @param length
     * @return
     */
    public static String left(String str, int length) {
        String rc = NVL(str);
        if (rc.length() <= length) {
            return str;
        }
        return rc.substring(0, length);
    }

    /**
     * NVL - fix null value
     * @param String value
     * @param replace with 
     * @return
     */
    public static String NVL(String str, String replace) {
        if (str == null || str.trim().equals("") || str.trim().toUpperCase().equals("NULL"))
            return replace;
        return str;
    }

    /**
     * NVL - fix null value 
     * @param string value 
     * @return
     */
    public static String NVL(String str) {
        return NVL(str, "");
    }

    /**
     * substring 
     * 
     * @param text
     * @param startPos
     * @param length
     * @return
     */
    public static String substring(String text, int startPos, int endPos) {
        String str = NVL(text);
        // enough length? 
        str = fill(str, endPos);
        // get substr 
        return str.substring(startPos, endPos).trim();
    }

    /**
     * fill
     * 
     * @param value
     * @param length
     * @param fillChar
     * @param isLeadingFill
     * @return
     */
    public static String fill(String value, int length, char fillChar, boolean isLeadingFill) {
        value = NVL(value);
        String rc = value;

        for (int i = 0; i < length - value.length(); i++) {
            if (isLeadingFill) {
                rc = fillChar + rc;
            } else {
                rc += fillChar;
            }
        }
        return rc;
    }

    /**
     * fill 
     * 
     * @param value
     * @param length
     * @param fillChar
     * @return
     */
    public static String fill(String value, int length, char fillChar) {
        return fill(value, length, fillChar, false);
    }

    /**
     * fill
     * 
     * @param value
     * @param length
     * @param isLeadingFill
     * @return
     */
    public static String fill(String value, int length, boolean isLeadingFill) {
        return fill(value, length, ' ', isLeadingFill);
    }

    /**
     * fill
     * 
     * @param value
     * @param length
     * @return
     */
    public static String fill(String value, int length) {
        return fill(value, length, ' ', false);
    }
}

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2. left(String str, int len)
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8. left(String text, int len)
9. left(String text, int max)