大二学生用java自编的简易计算器，全代码+.jar文件

import java.awt.*; import javax.swing.*; import java.awt.event.*; public class MainClass extends JFrame{ TextAreaButton textAreaButton=new TextAreaButton(); NumberButton numberButton=new NumberButton(); FuHaoButton fuHaoButton=new FuHaoButton(); JTextArea textArea=new JTextArea(1,30); JButton btn; JPanel panel; double i=0,num=0; char fuHao='='; public MainClass(String s){ super(s); Container contentPane=getContentPane(); numberButton.btn[0].addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ if(fuHao=='=') textAreaButton.textArea.setText(null); textAreaButton.textArea.setText(null); i=i*10+1; textAreaButton.textArea.append(""+i); } }); numberButton.btn[1].addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ if(fuHao=='=') textAreaButton.textArea.setText(""); textAreaButton.textArea.setText(null); i=i*10+2; textAreaButton.textArea.append(""+i); } }); numberButton.btn[2].addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ if(fuHao=='=') textAreaButton.textArea.setText(""); textAreaButton.textArea.setText(null); i=i*10+3; textAreaButton.textArea.append(""+i); } }); numberButton.btn[3].addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ if(fuHao=='=') textAreaButton.textArea.setText(""); textAreaButton.textArea.setText(null); i=i*10+4; textAreaButton.textArea.append(""+i); } }); numberButton.btn[4].addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ if(fuHao=='=') textAreaButton.textArea.setText(""); textAreaButton.textArea.setText(null); i=i*10+5; textAreaButton.textArea.append(""+i); } }); numberButton.btn[5].addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ if(fuHao=='=') textAreaButton.textArea.setText(""); textAreaButton.textArea.setText(null); i=i*10+6; textAreaButton.textArea.append(""+i); } }); numberButton.btn[6].addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ if(fuHao=='=') textAreaButton.textArea.setText(""); textAreaButton.textArea.setText(null); i=i*10+7; textAreaButton.textArea.append(""+i); } }); numberButton.btn[7].addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ if(fuHao=='=') textAreaButton.textArea.setText(""); textAreaButton.textArea.setText(null); i=i*10+8; textAreaButton.textArea.append(""+i); } }); numberButton.btn[8].addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ if(fuHao=='=') textAreaButton.textArea.setText(""); textAreaButton.textArea.setText(null); i=i*10+9; textAreaButton.textArea.append(""+i); } }); fuHaoButton.btn[0].addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ if(fuHao!='='){ fuHao='+'; //textAreaButton.textArea.setText(null); //textAreaButton.textArea.append("/"); } else{ //textAreaButton.textArea.setText(null); //textAreaButton.textArea.append("+"); num=i; i=0; fuHao='+'; } } }); fuHaoButton.btn[1].addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ if(fuHao!='='){ fuHao='-'; } else{ num=i; i=0; fuHao='-'; } } }); fuHaoButton.btn[2].addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ if(fuHao!='='){ fuHao='*'; } else{ num=i; i=0; fuHao='*'; } } }); fuHaoButton.btn[3].addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ if(fuHao!='='){ fuHao='/'; } else{ num=i; i=0; fuHao='/'; } } }); fuHaoButton.btn[4].addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ textAreaButton.textArea.setText(null); if(fuHao=='+'){ num=num+i; textAreaButton.textArea.append(""+num); i=0; num=0; fuHao='='; } if(fuHao=='-'){ num=num-i; textAreaButton.textArea.append(""+num); i=0; num=0; fuHao='='; } if(fuHao=='*'){ num=num*i; textAreaButton.textArea.append(""+num); i=0; num=0; fuHao='='; } if(fuHao=='/'){ num=num/i; textAreaButton.textArea.append(""+num); fuHao='='; } } }); textAreaButton.btn.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ i=0; num=0; textAreaButton.textArea.setText(null); fuHao='='; } }); contentPane.add(fuHaoButton,BorderLayout.EAST); contentPane.add(numberButton,BorderLayout.CENTER); contentPane.add(textAreaButton,BorderLayout.NORTH); setVisible(true); setSize(400,400); } public static void main(String []args){ MainClass x=new MainClass("王蒙做的计算器"); } }