从Java中的计算器获取结果

发布于 2024-10-11 14:16:55 字数 628 浏览 4 评论 0原文

我必须从单独的 JTextfield 计算两个输入，在组合框中选择一个运算符并根据所选运算符计算结果。然而，我得到的答案是 0。如何计算结果而不得到0？

private void jButton1_actionPerformed(ActionEvent e) {

    int x = Integer.parseInt(jTextField1.getText());
    int y = Integer.parseInt(jTextField2.getText());

    String Result = "0";
    jLabel4.setText(Result);
    int total = Integer.parseInt(Result);

    if(Operator.equals("+")) {
        total = x + y;
    }
    else if(Operator.equals("-")) {
        total = x - y;
    }
    else if(Operator.equals("*")) {
        total = x * y;
    }
    else if(Operator.equals("/")) {
        total = x / y;

    }

}

原文

I have to calculate two inputs from separate JTextfields, pick an operator in a combobox and calculate the result based on the operator chosen. However, I get 0 as my answer. How can I calculate the result without getting 0?

private void jButton1_actionPerformed(ActionEvent e) {

    int x = Integer.parseInt(jTextField1.getText());
    int y = Integer.parseInt(jTextField2.getText());

    String Result = "0";
    jLabel4.setText(Result);
    int total = Integer.parseInt(Result);

    if(Operator.equals("+")) {
        total = x + y;
    }
    else if(Operator.equals("-")) {
        total = x - y;
    }
    else if(Operator.equals("*")) {
        total = x * y;
    }
    else if(Operator.equals("/")) {
        total = x / y;

    }

}

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青芜 2024-10-18 14:16:55

那是因为你在计算结果后没有更新jLabel4。

在 if 之后，您应该添加另一个 jLabel4.setText(Integer.toString(result));

回复收藏 0 原文

不知在何时 2024-10-18 14:16:55

在此代码中，jLabel4 是结果标签。

您要做的是首先将“0”分配给字符串结果，然后将其（“0”）设置为文本，然后进行计算。

你应该做的是先计算然后设置结果。

private void jButton1_actionPerformed(ActionEvent e) {

    int x = Integer.parseInt(jTextField1.getText());
    int y = Integer.parseInt(jTextField2.getText());

    int total = 0;

    if(Operator.equals("+")) {
        total = x + y;
    }
    else if(Operator.equals("-")) {
        total = x - y;
    }
    else if(Operator.equals("*")) {
        total = x * y;
    }
    else if(Operator.equals("/")) {
        total = x / y;

    }

    jLabel4.setText(String.valueOf(total));


}

From this code the jLabel4 is the result label.

What You are doing is first you assign to String Result with "0", and the you set this ("0") as text then you calculate.

What You should do is to calculate first and then set the result.

private void jButton1_actionPerformed(ActionEvent e) {

    int x = Integer.parseInt(jTextField1.getText());
    int y = Integer.parseInt(jTextField2.getText());

    int total = 0;

    if(Operator.equals("+")) {
        total = x + y;
    }
    else if(Operator.equals("-")) {
        total = x - y;
    }
    else if(Operator.equals("*")) {
        total = x * y;
    }
    else if(Operator.equals("/")) {
        total = x / y;

    }

    jLabel4.setText(String.valueOf(total));


}

回复收藏 0 原文

念三年u 2024-10-18 14:16:55

您应该将该方法分为两部分：一部分负责结果的计算，另一部分负责显示。除此之外，您可能应该使用 double，否则除法会给您带来意想不到的结果，即 0（例如，在 1/2 的情况下）。

private void jButton1_actionPerformed(ActionEvent e) {

     int x = Integer.parseInt(jTextField1.getText());
     int y = Integer.parseInt(jTextField2.getText());

     double result = calculateResult(operator, x, y)
     jLabel4.setText(String.valueOf(result));
}

private double calculateResult(String operator, int x, int y) {

     if(operator.equals("+")) {
         total = x + y;
     }
     else if(operator.equals("-")) {
         total = x - y;
     }
     else if(operator.equals("*")) {
         total = x * y;
     }
     else if(operator.equals("/")) {
         total = x / y;

     }
     return total;
 }

You should separate the method into two parts: one responsible for the calculation of the result and the other for displaying. In addition to that you probably should use double, otherwise the division will give you unexpected results, i.e. 0 (e.g. in case of 1/2).

private void jButton1_actionPerformed(ActionEvent e) {

     int x = Integer.parseInt(jTextField1.getText());
     int y = Integer.parseInt(jTextField2.getText());

     double result = calculateResult(operator, x, y)
     jLabel4.setText(String.valueOf(result));
}

private double calculateResult(String operator, int x, int y) {

     if(operator.equals("+")) {
         total = x + y;
     }
     else if(operator.equals("-")) {
         total = x - y;
     }
     else if(operator.equals("*")) {
         total = x * y;
     }
     else if(operator.equals("/")) {
         total = x / y;

     }
     return total;
 }

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