package?你好;
public?class?Date?{
private?int?day,month,year;
??Date(int?i,int?j,int?k){
??day=i;
??month=j;
??year=k;
??}
??Date(){
??day=1;
??month=1;
??year=1998;
??}
??
??Date(Date?d){
??day=d.day;
??month=d.month;
??year=d.year;
??}
??public?void?printDate(){
??System.out.print(day+"/"+month+"/"+year);
??}
??public?Date?tomorrow(){
??Date?d=new?Date(this);//創(chuàng)建對(duì)象，對(duì)象名為d
??d.day++;
??if(d.day>d.dayInMonth()){
??d.day=1;
??d.month++;
??if(d.month>12){
??d.month=1;
??d.year++;
??
??}
??}
??return?d;
??}
??
??public?int?dayInMonth(){
??switch(month){
??case?1:case?3:case?5:case?7:
??case?8:case?10:case?12:
??return?31;
??case?4:case?6:case?9:case?11:
??return?30;
??default:
??if(year%100!=0?&&?year%4==0){
??return?29;
??}
???
??else?return?28 ;??
??}
??}
??
?public?static?void?main(String[]?args)?{
?
?Date?d1=new?Date();
?System.out.print("The?current?date?is?(dd/mm/yy):");
d1.printDate();
System.out.println();
System.out.print("The?current?date?is?(dd/mm/yy):");
d1.tomorrow().printDate();
System.out.println();
Date?d2=new?Date(28,2,1964);
System.out.print("The?current?date?is?(dd/mm/yy):");
d2.printDate();
System.out.println();
System.out.print("The?current?date?is?(dd/mm/yy):");
d2.tomorrow().printDate();
System.out.println();
}?
}
D:\a>javac?Date.java
D:\a>java?Date
錯(cuò)誤:?找不到或無法加載主類?Date
D:\a>
大神，這是下為啥呢？
qq_小杜_(tái)1
2017-04-21 11:01:00
