Question

我是Java新手，很抱歉这个愚蠢的问题。

我创建了一个名为Age的课程，作为退休计划课程的一部分。在该程序的主要方法中，如何使用JOptionPane通过创建的Age类中的setStartingAge和setRetirementAge方法来询问和设置其当前年龄和所需的退休年龄。

例如，这是创建的Age类：

public class Age
{
private int yearsToRetirement;
private int STARTING_AGE;
private int RETIREMENT_AGE;

public Age()
{
  STARTING_AGE = 0;
  RETIREMENT_AGE = 0;
}

// Parameterized Constructor
public Age(int sa, int ra)
{
    setStartingAge(sa);
  setRetirementAge(ra);
}   
public int getStartingAge()
{
    return STARTING_AGE;
}

public int getRetirementAge()
{
    return RETIREMENT_AGE;
}

public int getYearsToRetire()
{
  yearsToRetirement = RETIREMENT_AGE - STARTING_AGE;
  return yearsToRetirement;
}

public void setStartingAge(int sa)
{
    if (sa > 0)
    {   
        STARTING_AGE = sa;
    }
    else
    {
        STARTING_AGE = 0;
    }
}

public void setRetirementAge(int ra)
{
    if (ra > STARTING_AGE)
    {   
        RETIREMENT_AGE = ra;
    }
    else
    {
        RETIREMENT_AGE = 0;
    }
}

public String toString()
{
    return "Starting Age: " + getStartingAge()
  + "\nRetirement Age: " + getRetirementAge()
  + "\nYears until retirement: " + getYearsToRetire();
}
}

在主要方法中，我想做类似

的事情

  Age age = new Age();
  JOptionPane.showInputDialog("Enter your current age in years(ex: 21):");
  JOptionPane.showInputDialog("Enter the age you wish to retire at:");
  JOptionPane.showMessageDialog(null, age);

如何修改上面的代码以使两个输入对话框将用户的输入传递给Age类中的setStarting age和setRetirementAge？

-RR

Answer 1

JOptionPane.showInputDialog返回您输入的字符串。您只需获取此字符串并将其转换为整数（如果可能）。

public static void main(String[] args) {
    Age age = new Age();
    String startingAgeAsString = JOptionPane.showInputDialog("Enter your current age in years(ex: 21):");
    String retirementAgeAsString = JOptionPane.showInputDialog("Enter the age you wish to retire at:");
    try {
        age.setStartingAge(Integer.parseInt(startingAgeAsString));
    } catch (NumberFormatException e) {}
    try {
        age.setRetirementAge(Integer.parseInt(retirementAgeAsString));
    } catch (NumberFormatException e) {}
    JOptionPane.showMessageDialog(null, age);
}

如何将JOptionPane.showInputDialog与我创建的类一起使用？

1 个答案: