对齐输出

JDK自带了对齐输出：

import java.util.Formatter;

public class FormatterTest {
    public static void main(String[] args) {
        Formatter fmt = new Formatter();
        fmt.format("|%-40s|", "dd");
        System.out.println(fmt);
        fmt = new Formatter();
        fmt.format("|%-40s|\t\n|%-40s|", "dddddd", "mmm");
        System.out.println(fmt);
        fmt = new Formatter();
        fmt.format("|%-40s|", "ddaaaa");
        System.out.println(fmt);
    }
}