java图形界面AWT编写计算器

import java.awt.BorderLayout; import java.awt.GridLayout; import java.awt.TextField; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import java.awt.Color;  public class JiSuanJi {      private JFrame frame;  //声明相关布局面板   private JPanel panelwest;   private JPanel panelcenter;   private JPanel paneleast;   private TextField tf;      private JButton buttonzero; //声明按钮控件   private JButton buttondot;   private JButton buttonequal;   private JButton buttonplus,buttonminus,buttonmultiple,buttondevision,buttonsin,buttontozero;   private JButton buttonone,buttontwo,buttonthree,buttonfour,buttonfive,buttonsix,buttonseven,buttoneight,buttonnine;       private ButtonListener listener;            //声明监听事件      public static void main(String args[]){     new JiSuanJi();   }    public JiSuanJi(){          initView();                    //实例化相关对象          setCenter();                    //布局添加控件及相关控件处理     setWest();     setEast();          addListener();                   //设置监听          setFrame();                    //对 frame设置布局及显示处理        }    class ButtonListener implements ActionListener{     int biaozhi=0;                   //初始化相关变量     double flag1=0,flag2=0,flag3=0;     //@Override     public void actionPerformed(ActionEvent e){       //(1)通过 e.getSource()，获取点击事件的按钮来源，作出相应处理        if(e.getSource()==buttondot){         tf.setText("0.");       }       if(e.getSource()==buttontozero){         tf.setText("");       }       if(e.getSource()==buttonzero){         tf.setText(tf.getText()+"0");         flag1=Double.parseDouble(tf.getText());       }       else if(e.getSource()==buttonone){         tf.setText(tf.getText()+"1");//文本框显示1、2、3.。。         flag1=Double.parseDouble(tf.getText());       }       else if(e.getSource()==buttontwo){         tf.setText(tf.getText()+"2");         flag1=Double.parseDouble(tf.getText());       }       else if(e.getSource()==buttonthree){         tf.setText(tf.getText()+"3");         flag1=Double.parseDouble(tf.getText());       }       else if(e.getSource()==buttonfour){         tf.setText(tf.getText()+"4");         flag1=Double.parseDouble(tf.getText());       }       else if(e.getSource()==buttonfive){         tf.setText(tf.getText()+"5");         flag1=Double.parseDouble(tf.getText());       }              else if(e.getSource()==buttonsix){         tf.setText(tf.getText()+"6");         flag1=Double.parseDouble(tf.getText());       }       else if(e.getSource()==buttonseven){         tf.setText(tf.getText()+"7");         flag1=Double.parseDouble(tf.getText());       }       else if(e.getSource()==buttoneight){         tf.setText(tf.getText()+"8");         flag1=Double.parseDouble(tf.getText());       }       else if(e.getSource()==buttonnine){         tf.setText(tf.getText()+"9");         flag1=Double.parseDouble(tf.getText());       }       if(e.getSource()==buttonplus){         tf.setText("");         flag2=flag1;         biaozhi=0;       }       if(e.getSource()==buttonminus){         tf.setText("");         flag2=flag1;         biaozhi=1;       }       if(e.getSource()==buttonmultiple){         tf.setText("");         flag2=flag1;         biaozhi=2;       }       if(e.getSource()==buttondevision){         tf.setText("");         flag2=flag1;         biaozhi=3;       }       if(e.getSource()==buttonsin){         flag3=Math.sin(flag1);         tf.setText(flag3+"");       }       if(e.getSource()==buttonequal){         if(biaozhi==0){           flag3=flag2+flag1;         }         if(biaozhi==1){           flag3=flag2-flag1;         }         if(biaozhi==2){           flag3=flag2*flag1;         }         if(biaozhi==3){           flag3=flag2/flag1;         }         tf.setText(flag3+"");       }     }   }      private void initView(){          /**      * 创建框架、小容器对象、按钮对象      */     tf = new TextField(30);//初始化界面宽度     frame = new JFrame("简易计算机");     panelcenter = new JPanel();     panelwest = new JPanel();     paneleast = new JPanel();          listener = new ButtonListener(); //实例化监听对象   }      private void setCenter(){          //(1)初始化控件显示值     buttonone=new JButton("1");     buttontwo=new JButton("2");     buttonthree=new JButton("3");     buttonfour=new JButton("4");     buttonfive=new JButton("5");     buttonsix=new JButton("6");     buttonseven=new JButton("7");     buttoneight=new JButton("8");     buttonnine=new JButton("9");          //(2)设置布局样式     panelcenter.setLayout(new GridLayout(3,3));//根据内容多少来布局          //(3)中央布局添加控件按钮     panelcenter.add(buttonone);     panelcenter.add(buttontwo);     panelcenter.add(buttonthree);     panelcenter.add(buttonfour);     panelcenter.add(buttonfive);     panelcenter.add(buttonsix);     panelcenter.add(buttonseven);     panelcenter.add(buttoneight);     panelcenter.add(buttonnine);   }      private void setEast(){          //(1)设置控件显示符号     buttonplus=new JButton("+");     buttonminus=new JButton("-");     buttonmultiple=new JButton("*");     buttondevision=new JButton("/");     buttonsin=new JButton("sin");     buttontozero=new JButton("清除");          //(2)设置布局样式     paneleast.setLayout(new GridLayout(3,2));          //(3)右布局添加相应按钮控件     paneleast.add(buttonplus);     paneleast.add(buttonminus);     paneleast.add(buttonmultiple);     paneleast.add(buttondevision);     paneleast.add(buttonsin);     paneleast.add(buttontozero);        }    private void setWest(){          //(1)初始化控件显示值     buttonzero=new JButton("0");     buttondot=new JButton(".");     buttonequal = new JButton("=");          //(2)对这三个按钮设置布局     panelwest.setLayout(new GridLayout(3,1));          //(3)左边布局添加按钮控件,将三个按钮添加入布局     panelwest.add(buttonzero);     panelwest.add(buttondot);     panelwest.add(buttonequal);        }    private void addListener(){          //(1)对 1-9对应的按钮添加监听     buttonone.addActionListener(listener);     buttontwo.addActionListener(listener);     buttonthree.addActionListener(listener);     buttonfour.addActionListener(listener);     buttonfive.addActionListener(listener);     buttonsix.addActionListener(listener);     buttonseven.addActionListener(listener);     buttoneight.addActionListener(listener);     buttonnine.addActionListener(listener);          //(2)对运算符对应的按钮添加监听     buttonplus.addActionListener(listener);     buttonminus.addActionListener(listener);     buttonmultiple.addActionListener(listener);     buttondevision.addActionListener(listener);     buttonsin.addActionListener(listener);     buttontozero.addActionListener(listener);          //(3)对其与的符号对应的按钮监听     buttonzero.addActionListener(listener);     buttondot.addActionListener(listener);     buttonequal.addActionListener(listener);        }    private void setFrame(){          frame.setLayout(new BorderLayout());     //将准备的不同方位的内容加入大框架     frame.add(paneleast,"East");     frame.add(tf,BorderLayout.NORTH);     frame.add(panelwest,BorderLayout.WEST);     frame.add(panelcenter,BorderLayout.CENTER);     //设置颜色     tf.setBackground(Color.green);     frame.pack();     //将框架展开     frame.setLocation(500,500);     //程序框架在屏幕的位置     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     //退出进程，不加此句，关闭页面但程序进程仍在后台运行     frame.setVisible(true);     //一个图形界面默认都是不可见的，setVisible是把图形界面设置为可见        } }