题目
实现一个leftpad库，如果不知道什么是leftpad可以看样例
样例
leftpad("foo", 5)>> " foo"
leftpad("foobar", 6)>> "foobar"
leftpad("1", 2, "0")>> "01"
代码
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
int len = originalStr.length();
StringBuilder sb = new StringBuilder();
if (size <= len) return originalStr;
else {
for (int i = 0; i < size-len; i++) sb.append(" ");
sb.append(originalStr);
}
return sb.toString();
}
/**
* @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
int len = originalStr.length();
StringBuilder sb = new StringBuilder();
if (size <= len) return originalStr;
else {
for (int i = 0; i < size-len; i++) sb.append(padChar);
sb.append(originalStr);
}
return sb.toString();
}
}
