请问大家Integer.valueOf()在这是什么作用?

import java.util.Calendar;

public class Datereferance {
private int day;
private int month;
private int year;

private static boolean validDate(int d, int m, int y) {
return (d > 0 && d < 32 && m > 0 && m <13 && y > 0);
}

public Datereferance() {
day = month = year = 0;
}

public Datereferance(int d, int m, int y){
if (validDate(d,m,y)) {// validDate is static
day = d;
month = m;
year = y;
}
else
day = month = year = 0;
}

public Datereferance(int d, int m) { //day and month + current year
this(d,m,Calendar.getInstance().get(Calendar.YEAR));
}

public Datereferance(int d) { // day + current month and year
this(d,Calendar.getInstance().get(Calendar.MONTH));
}

private static int convertMonth(String m) {

int day = 0;

if (m.equa

VAL是什么 excel val Integer.toString() integer.parseInt() integer问题 val(text2.text) 关于VB中的VAL VB中Val是什么 val开头 英语单词 Dim a As Integer, b As Integer, c As Integer, aa As Integer, bb As Integer