如何激活Java小程序中的“提交"按钮以总计所有总计并显示更改 [英] How do i activate the submit button in a java applet to add up all totals and display change

问题描述

我创建了一个提交按钮sButton；那应该从3个盒子中取出所有总数，如果那个总数大于1，那么应该从1中减去它，其余的应该显示为变化...这就是我所拥有的

Hi ,
I have created a submit button sButton; that should take all totals from 3 boxes and if that total is greater than 1, then it should be subtracted from 1 and the remainder is suppose to be displayed as change...this is what i have

if(evt.getSource()==sButton)
{
   change.setText(---'I DON'T KNOW WHAT TO PUT HERE')
   selections.setText('Vending....');
}

并在另一个课程中将我拥有的3个总数相加

and in another class to add up the 3 totals i have

public String total5()
{
    total5=total+total2+total3+total4;
    String blank =new String();
    blank=''+total5;
    return blank;
}

所以我的问题是我该如何使用total5来比较它是否大于或小于1并在"change.setText()"中显示它是否结束；

so my question is how do i use the total5 to compare if it''s over 1 or less and display if it''s over in the "change.setText( )"; text box?

推荐答案

如果更改total方法以返回数字:

If you change total method to return a number:

double getTotal()
{
   return (total+total2+total3+total4);
}

然后可以在事件处理程序中使用它:

You can then use it in your event handler:

if(evt.getSource()==sButton)
{
   double total = obj.getTotal();
   if (total < 1)
   {
      change.setText("Not enough");
      return;
   }

   change.setText("Change

" +(总计- 1 )； selections.setText(" ); }

" + (total-1); selections.setText("Vending...."); }

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