524. 左填充

524. 左填充 

•  描述
•  笔记
•  数据
•  评测

实现一个leftpad库，如果不知道什么是leftpad可以看样例

您在真实的面试中是否遇到过这个题？ 

Yes

样例

leftpad("foo", 5)
>> "  foo"

leftpad("foobar", 6)
>> "foobar"

leftpad("1", 2, "0")
>> "01"

public class StringUtils {
    /**
     * @param originalStr the string we want to append to with spaces
     * @param size the target length of the string
     * @return a string
     */
    static public String leftPad(String originalStr, int size) {
        // Write your code here
        String a = "";
        for(int i = 0; i < size-originalStr.length() ;i++){
            a= a+" ";
        }
        return a+originalStr;
    }

    /**
     * @param originalStr the string we want to append to
     * @param size the target length of the string
     * @param padChar the character to pad to the left side of the string
     * @return a string
     */
    static public String leftPad(String originalStr, int size, char padChar) {
        // Write your code here
        String a = "";
        for(int i = 0; i < size-originalStr.length() ;i++){
            a= a+padChar;
        }
        return a+originalStr;
    }
}