当用户单击按钮 1/2 时 JVM 没有响应，它只是卡住了

Question

I am trying to make a program that user is able to enter a date like: 28 -03 - 2014 .

This and the program reads that, gives the date of tomorrow like: 29 - march - 2014 . The program must check about:

• String max 10.
• date of day(2 digit): 1 - 31
• String: -
• month (two digit): 1 - 12
• String: -
• year : four digits

Here is my code!

    public String month()
    {
            int month = 0;
            switch(month){
            case 1 :monthString = " Janauri";
                    break;
             case 2: monthString = "February"
    .......
    ublic String dateOfTomorrow(int day, int month, int year)

    {
    String Date =  day+ "-" + month+ "- " + year;
    day++;
    if(day > totalDaysInMonth(month));
    {// new  month
    day = 1;
    month++;
    if(month > 12)
    {//new year
    month= 1;
    year ++;
    }
  }
    return Date;

    }
        private boolean  totalDaysInMonth(int day)
        {
            if( day >= 1 && day < 31)
            {
                return true;
            }
            else {
                return false;
                }
        }


        public void actionPerformed(ActionEvent e)
            {
            for ( int i = 1; i<31;);
                String s = tf.getText();
                if ( e.getSource() == b1)
                {

                    l2.setText(s);

                }
                else if (e.getSource ()== b2)
                {
                    l2.setText(monthString);
                }

            }

Answer 1

I think your problem is in this loop:

for ( int i = 1; i<31;);

which will never end. Remove that empty loop or change it to:

for ( int i = 1; i<31;i++);

Answer 2

I don't really understand what you mean by 1/2 stack. But if you make a string of some variables

String Date =  day + "-" + month + "-" + year;

and then change the variables it doesn't have any effect on the string. So you will still get the same date back.

And a tip for better readability makes your variables camel cased. So instead of Date call it date.