java 如何从其他文本字段中获取文本字段中的 int 值

How to take int value in text field from other textfield

提问by Ank-It

I'm new to java. I create project where I have one textField and one button. I make function for button, where I start my other function and it's ok. But I need to take number value from textField as parameter for my function...

我是 Java 新手。我创建了一个项目，其中有一个 textField 和一个按钮。我为按钮创建功能，在那里我开始我的其他功能，没关系。但是我需要将 textField 中的数值作为我的函数的参数...

b1.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e)
            {
                 int price;
                 int quantity = Integer.parseInt(tf2.getText());
                 int totalamount = price*quantity;
              //need to insert this total amout into textfield tf4 //


             tf4.getText(totalamount); //showing error ;   

            }

        });

help me in please ,thank you in advance

请帮助我，提前谢谢

采纳答案by Sandip Armal Patil

This is simple...
You can get integer value from textfield like

这很简单......
您可以从文本字段中获取整数值，例如

int totalamount = Integer.parseInt(tf2.getText());

int totalamount = Integer.parseInt(tf2.getText());

getText() method are use to get value from textfield and If this value is integer the you can parse it like Integer.parseInt, If this value is string then you can get this value using toString() method.

getText() 方法用于从文本字段中获取值，如果该值是整数，则可以像 Integer.parseInt 一样解析它，如果该值是字符串，则可以使用 toString() 方法获取该值。

and you can set this value like

你可以像这样设置这个值

   tf4.setText(String.valueOf(totalamount));  

setText() method are use to set text to Textfield.

setText() 方法用于将文本设置为 Textfield。

You can use this value in function call as a parameter to call function like

您可以在函数调用中使用此值作为参数来调用函数，例如

myFunction(totalAmount);// function declaration

And use this value in Function Definition like

并在函数定义中使用此值，例如

 public void myFunction(int totalamount)// Function Defination

You have to read Basic Java. Here is link which help you

您必须阅读 Basic Java。这是可以帮助您的链接

回答by Freak

just replace your this line

只需更换您的这一行

tf4.getText(totalamount); 

by this one

通过这个

tf4.setText(Integer.toString(totalamount));

OR
tf4.setText(totalamount);
because TextFieldhave overloded methods for setting text for Stringsand int.

或者
tf4.setText(totalamount);
因为TextField已经覆盖了为Strings和设置文本的方法int。

Please keep in mind that You never pass a value(by convention of Java) from a getter method.Only parameters can be passed from setter methods (if we are considering them in Beans sense or any other as well).Please follow some basics of Java hereand here

请记住，你永远不会从 getter 方法传递值（按照 Java 的约定）。只有参数可以从 setter 方法传递（如果我们在 Beans 或任何其他意义上考虑它们）。请遵循一些基础知识Java在这里和这里

回答by Xiaoerge

b1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{ 
    //put the try catch here so if user didnt put an integer we can do something else
    try
    {
        int price;
        int quantity = Integer.parseInt(tf2.getText());
        int totalamount = price*quantity;

        //need to insert this total amout into textfield tf4 //

        tf4.setText(totalamount);
    }
    catch(NumberFormatException ex)
    {
          //do something like telling the user the input is not a number
    }   

}});

回答by Michael 'Maik' Ardan

 b1.addActionListener(new ActionListener(){ 
    public void actionPerformed(ActionEvent e) { 
       int price; 
       int quantity = Integer.parseInt(tf2.getText()); 
       //int totalamount = price*quantity; 
       //need to insert this total amout into textfield tf4 //

       tf4.setText(totalamount); //showing error ;   

    }

 });