// Here are some random String utilities

class StringUtils {

    static String padding =
        "                                                                ";

    static String PadLeft (String s, int fieldwidth) {
        int length = s.length();
        if (length >= fieldwidth)
            return s;
        else
            return (padding.substring(0, fieldwidth - length)) + s;
    }
    
    static String PadLeft (int i, String s, String target) {
        int length = s.length();
        if (length >= i)
            return s;
        else
            for(int ilengh = 0; ilengh < i - ilengh; ilengh++) {
                target = s + target;                 
            }
            return target;
    }

    static String PadRight (String s, int fieldwidth) {
        int length = s.length();
        if (length >= fieldwidth)
            return s;
        else
            return s + (padding.substring(0, fieldwidth - length));
    }
    
    static String PadRight (int i, String s, String target) {
        int length = s.length();
        if (length >= i)
            return s;
        else
            for(int ilengh = 0; ilengh < i - ilengh; ilengh++) {
                target = target + s;                 
            }
            return target;
    }
}

public class StringPadLeft {
    public StringPadLeft() {
        // 処理対象となる文字列変数を宣言する
        String stTarget = "1234";
        // 6 文字になるまで先頭を半角スペースで埋める
        System.out.println("[" + StringUtils.PadLeft(stTarget, 6) + "]");
        // 8 文字になるまで先頭を "0" で埋める
        System.out.println("[" + StringUtils.PadLeft(8, "0", stTarget) + "]");
        // 6 文字になるまで末尾を半角スペースで埋める
        System.out.println("[" + StringUtils.PadRight(stTarget, 6) + "]");
        // 8 文字になるまで末尾を "0" で埋める
        System.out.println("[" + StringUtils.PadRight(9, "0", stTarget) + "]");

    }

    public static void main(String[] args) {
        StringPadLeft stringPadLeft = new StringPadLeft();
    }
}