JAVA真的适合做图形界面吗？我今天连个简单的布局JAVA都似乎都不能实现，请问我这是哪里出了问题？

我想设计一个400*600的计算器界面，文本框占据400*200，按钮区域占400*400；于是我是用GridBagLayout布局，文本框使用一个名为TextField的panel，占1行1列。按钮区域是名为ButtonArea的panel，占2行1列。但是显示出来的效果两块区域的大小却都是一行一列，我的代码里面明明写得很清楚两个panel占用的大小是不一样的，为什么还会这样呢？问题出在哪里？
还有一个问题我想请问一下，我想把TextField区域的文本显示调整为右下角（现在只是水平居中，我想要的靠下右对齐），请问有办法做到吗？

package Calculator;  

  

import javax.swing.*;  

  

import java.awt.*;  

  

public class Calculator{  

  

  

    JFrame calculator;//整体框架  

    JPanel ButtonArea;//按扭区域  

    JPanel TextArea;//文字显示区域  

    JButton button[];//按钮数组  

    JTextField  textField;//文本框  

    GridBagLayout gridBagLayout;//GridBagLayout布局对象  

    GridBagConstraints gridBagConstraints;//GridBagLayout条件管理对象  

    String chars[]={"CE","C","DEL","/","7","8","9","*","4",  

            "5","6","-","1","2","3","+","0",".","=","SCI"};  

  

    Calculator(){  

        calculator = new JFrame("计算器");//整体框架  

        ButtonArea = new JPanel();//按扭区域  

        TextArea = new JPanel();//文字显示区域  

        button = new JButton[20];  

        textField=new JTextField("0");  

        for(int i=0;i<chars.length;i++){  

            button[i]=new JButton(chars[i]);  

        }  

        gridBagLayout=new GridBagLayout();  

        gridBagConstraints=new GridBagConstraints();  

        gridBagConstraints.fill=GridBagConstraints.BOTH;  

        gridBagConstraints.weightx=0.1;  

        gridBagConstraints.weighty=0.1;  

    }  

  

    void Run(){  

  

        calculator.setSize(400, 600);  

        calculator.setLayout(gridBagLayout);  

  

        //下面的用来对GridBayLayout进行布局管理  

  

        ButtonArea.setLayout(new GridLayout(5,4));  

        for(int i=0;i<chars.length;i++)  

          ButtonArea.add(button[i]);  

  

        TextArea.setLayout(gridBagLayout);  

        gridBagConstraints.gridx=0;  

        gridBagConstraints.gridy=0;  

        gridBagConstraints.gridwidth=1;  

        gridBagConstraints.gridheight=1;  

        gridBagLayout.setConstraints(textField,gridBagConstraints);  

  

        textField.setHorizontalAlignment(SwingConstants.RIGHT);  

        textField.setFont(new Font("微软雅黑",Font.BOLD,60));  

        TextArea.add(textField);  

  

        gridBagConstraints.gridx=0;  

        gridBagConstraints.gridy=0;  

        gridBagConstraints.gridwidth=1;  

        gridBagConstraints.gridheight=1;  

        gridBagLayout.setConstraints(TextArea,gridBagConstraints);  

        calculator.add(TextArea);  

  

        gridBagConstraints.gridx=0;  

        gridBagConstraints.gridy=1;  

        gridBagConstraints.gridwidth=1;  

        gridBagConstraints.gridheight=2;  

  

        gridBagLayout.setConstraints(ButtonArea,gridBagConstraints);  

        calculator.add(ButtonArea);  

  

        calculator.setVisible(true);  

    }  

    public static void main(String args[]) {  

        new Calculator().Run();  

        //Calculator  

    }  

}