java实现oracle函数rpad和lpad

import junit.framework.TestCase;

public class StringTest extends TestCase{
public void ntestRpad(){
System.out.println(rpad("1",3,"0"));
}
public void testLpad(){
System.out.println(lpad("1",3,"0"));
}
private String lpad(String s, int n, String replace) {
while (s.length() < n) {
s = replace+s;
}
return s;
}
private String rpad(String s, int n, String replace) {
while (s.length() < n) {
s = s+replace;
}
return s;
}
}