如何在升级中一次使用JOptionPane.showMessageDialog

Question

How many times have you used the statement: JOptionPane.showMessageDialog? If your answer is more than once go back and revise your code so that you only use ONE JOptionPane.showMessageDialog

Hint: consider using a variable of type String named output

Code

if(credit >= 120)

  {

     JOptionPane.showMessageDialog(null,"You've graduated!");

  }//end if

  else if(credit >= 90)

  {

     JOptionPane.showMessageDialog(null,"You're a senior.");

  }//end if

  else if(credit >= 60)

  {

     JOptionPane.showMessageDialog(null,"You're a junior.");

  }//end if

  else if(credit >= 30)

  {

     JOptionPane.showMessageDialog(null,"You're a sophomore.");

  }//end if

  else if(credit >=0)

  {

     JOptionPane.showMessageDialog(null,"You're a freshment.");

  }//end if


  else

  {
     JOptionPane.showMessageDialog(null,"invalid input");

Answer 1

使用if-else语句生成要显示的String，然后使用一行使用String调用showMessageDialog() 。

Answer 2

//don't forget to import the JOptionPane library

//also I have no clue how you used your credit variable public class prograde { public void showJoption(String position) { JOptionPane.showMessageDialog(null, position); }

public static void main(String[] args)
{
    //this is the class object that you can use to call the showJoption() method.
    prograde display = new prograde();

    if(credit >= 120)
    {
        display.showJoption("You've graduated!");
    }
    else if (credit >= 90)
    {
        display.showJoption("You're a senior.");
    }
    else if (credit >= 60)
    {
        display.showJoption("You're a junior.");
    }
    else if (credit >= 30)
    {
        display.showJoption("You're a sophomore.");
    }
    else if (credit >= 0)
    {
        display.showJoption("You're a freshment.");
    }
    else {
        display.showJoption("invalid input");
    }
}   

}