我在窗口中添加数字有问题吗？ [英] I have a problem to adding numbers in my window ?

问题描述

我的问题是我把两个数字放在TextField中，点击结果按钮后它不会给我两个数字的总和！

我不确定我添加到活动中的扫描仪，这只是我对JFrame中读取数字的看法。

这里是我的代码：











包calculator.addition;



import javax.swing。*;

import java.awt。*;

import java.awt.event。*;

import java.util.Scanner;







公共类CalculatorAddition {

public static int a;

public static int b; // globale var

public static int s;



public CalculatorAddition（）{



JFrame f = new JFrame（）;

JTextField t1 = new JTextField（ ）;

JTextField t2 = new JTextField（）;

JTextField t3 = new JTextField（）;

JButton b3 =新的JButton（结果）;



f.setSize（150,150）;

t1.addActionListener（（ActionEvent arg0） - >

{Scanner in = new Scanner（System.in）; //我添加Scanner方法来读取用户的数字

a = in.nextInt（）;

t3.setText（Integer.toString（a））;}）;







t2.addActionListener（（ActionEvent arg0） - > // event

{Scanner in = new Scanner（System.in）;

b = in.nextInt（） ;

}）;





b3.addActionListener（（ActionEvent） - >

{s = a + b;

t3.setText（Integer.toString（s））;

}）;









JPanel p = new JPanel（）;

p。 add（t1）;

p.add（t2）;

p.add（t3）;

p.add（b3）;

f.getContentPane（）。add（p，BorderLayout.CENTER）;

f.show（）;

}

public static void main（String ... arg）

{CalculatorAddition p = new CalculatorAddition（） ;

}}



我的尝试：



i将事件更改为新类但它保持不起作用！

My problem is whene i put the two number in the TextField , after clicking on the "Result" button it won't give me the total of two numbers !
and i m not sure about the Scanner that i add into the event, it s just my opinion about reading numbers in the JFrame .
here is my Code :





package calculator.addition;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Scanner;



public class CalculatorAddition {
public static int a ;
public static int b ;//globale var
public static int s ;

public CalculatorAddition(){

JFrame f = new JFrame();
JTextField t1 = new JTextField(" ");
JTextField t2 = new JTextField(" ");
JTextField t3 = new JTextField(" ");
JButton b3 = new JButton("result");

f.setSize(150,150);
t1.addActionListener((ActionEvent arg0) ->
{Scanner in = new Scanner(System.in);//i add Scanner method to read the numbers from user
a = in.nextInt();
t3.setText(Integer.toString(a));});



t2.addActionListener((ActionEvent arg0) -> //event
{Scanner in = new Scanner(System.in);
b = in.nextInt();
});


b3.addActionListener((ActionEvent) ->
{s = a+b ;
t3.setText(Integer.toString(s));
});




JPanel p = new JPanel();
p.add(t1);
p.add(t2);
p.add(t3);
p.add(b3);
f.getContentPane().add(p,BorderLayout.CENTER);
f.show();
}
public static void main(String...arg)
{ CalculatorAddition p = new CalculatorAddition();
}}

What I have tried:

i was change the event to new class but it keep doesn t work !

推荐答案

Scanner sc = new Scanner(System.in);

此行用于扫描程序从控制台读取输入。您希望它如何从 JTextField 中读取？



要从 JTextField 中检索值，它应该类似于

This line is used for scanner to read an input from the console. How would you expect it to read from the JTextField ?

To retrieve value from JTextField, it should be something like

int a = t1.getText();

如果你想增加 JTextField 的宽度，请使用< b> JTextField（5）而不是使用 JTextField（）。

If you want to increase the width of the JTextField, use JTextField(5) instead, don't use JTextField(" ").

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