qt.afl.after.sales/src/test/java/SimpleTest.java

import java.text.DecimalFormat;
import java.text.SimpleDateFormat;

public class SimpleTest {

    private static final SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM");

    public static void main(String[] args) {
        Long a = 1L;
        DecimalFormat decimalFormat = new DecimalFormat("000000");
        String format = decimalFormat.format(a);
        System.out.println(format);


    }

}