java 数组实现大数加减乘除运算

import java.awt.Color; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextArea; import java.io.*; import java.util.Date; public class WinFrame extends JFrame { public JPanel buttomjpanel; public JPanel leftpanel; public JPanel rightpanel; public JTextArea jtextareaa; public JTextArea jtextareab; public JTextArea jtextarearesult; public JLabel timeshow; int aLength = 1000,bLength = 900; BigNumber a = null; BigNumber b = null; public String result=""; public String time=""; public static long start,end;//时间 public static void setStartTime(long s){ start = s; } public static void setEndTime(long e){ end = e; } public WinFrame(){ super("大数运算器"); this.setBounds(200,200,680, 400); this.setLayout(null); this.init(); this.setVisible(true); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void init(){ this.buttomjpanel=new JPanel(); this.buttomjpanel.setBounds(0, 0, 680,400); this.buttomjpanel.setBackground(Color.white); this.buttomjpanel.setLayout(null); this.leftpanel=new JPanel(); this.leftpanel.setLayout(null); this.leftpanel.setBounds(0,0,550,400); this.leftpanel.setBackground(Color.white); JLabel abiao=new JLabel(); abiao.setText("大数a:"); abiao.setBounds(5,0,50,100); this.leftpanel.add(abiao); this.jtextareaa=new JTextArea(5,45); JScrollPane jspa=new JScrollPane(jtextareaa); this.jtextareaa.setEditable(false); this.jtextareaa.setLineWrap(true); jspa.setBounds(50,0,500,100); this.jtextareaa.setBackground(Color.white); jspa.setBackground(Color.white); this.leftpanel.add(jspa); JLabel bbiao=new JLabel(); bbiao.setText("大数b:"); bbiao.setBounds(5,100,50,100); this.leftpanel.add(bbiao); this.jtextareab=new JTextArea(5,45); JScrollPane jspb=new JScrollPane(jtextareab); jtextareab.setEditable(false); this.jtextareab.setLineWrap(true); jspb.setBounds(50,100,500,100); this.jtextareab.setBackground(Color.white); jspb.setBackground(Color.white); this.leftpanel.add(jspb); JLabel timebiao=new JLabel(); timebiao.setText("用时(秒):"); timebiao.setBounds(5,200,100,50); this.leftpanel.add(timebiao); this.timeshow=new JLabel(); timeshow.setBounds(100,200,100,50); this.leftpanel.add(this.timeshow); JLabel resultbiao=new JLabel(); resultbiao.setText("结果:"); resultbiao.setBounds(5,250,50,50); this.leftpanel.add(resultbiao); this.jtextarearesult=new JTextArea(5,45); JScrollPane jspr=new JScrollPane(jtextarearesult); jtextarearesult.setEditable(false); this.jtextarearesult.setLineWrap(true); jspr.setBounds(50,250,500,100); this.jtextarearesult.setBackground(Color.white); jspr.setBackground(Color.white); this.leftpanel.add(jspr); this.buttomjpanel.add(this.leftpanel); this.rightpanel=new JPanel(); this.rightpanel.setLayout(null); this.rightpanel.setBounds(550,0,100,500); this.rightpanel.setBackground(Color.white); JButton qingling=new JButton("清零"); qingling.setBounds(0,5,100,40); qingling.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent arg0) { jtextareaa.setText(""); jtextareab.setText(""); jtextarearesult.setText(""); timeshow.setText(""); } }); this.rightpanel.add(qingling); JButton bianhuan=new JButton("变数"); bianhuan.setBounds(0,55,100,40); bianhuan.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent arg0) { setStartTime(System.currentTimeMillis()); jtextareaa.setText((a=new BigNumber(1000)).toString()); jtextareab.setText((b=new BigNumber(900)).toString()); jtextarearesult.setText(""); setEndTime(System.currentTimeMillis()); timeshow.setText((end-start)+""); writeToFile("a:"+a.toString()); writeToFile("b:"+b.toString()); } }); this.rightpanel.add(bianhuan); JButton jia=new JButton("加"); jia.setBounds(0,105,100,40); jia.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent arg0) { if(null!=a&&null!=b){ setStartTime(System.currentTimeMillis()); try{ jtextarearesult.setText(a.plus(b).toString()); }catch(Exception e){ writeToFile(e.toString()); } setEndTime(System.currentTimeMillis()); timeshow.setText((end-start)+""); writeToFile("a+b:"+jtextarearesult.getText()); } } }); this.rightpanel.add(jia); JButton jian=new JButton("减"); jian.setBounds(0,155,100,40); jian.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent arg0) { if(null!=a&&null!=b){ setStartTime(System.currentTimeMillis()); try { jtextarearesult.setText(a.sub(b).toString()); } catch (Exception e) { writeToFile(e.toString()); } setEndTime(System.currentTimeMillis()); timeshow.setText((end-start)+""); writeToFile("a-b:"+jtextarearesult.getText()); } } }); this.rightpanel.add(jian); JButton cheng=new JButton("乘"); cheng.setBounds(0,205,100,40); cheng.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent arg0) { if(null!=a&&null!=b){ setStartTime(System.currentTimeMillis()); try { jtextarearesult.setText(a.multiply(b).toString()); } catch (Exception e) { writeToFile(e.toString()); } setEndTime(System.currentTimeMillis()); timeshow.setText((end-start)+""); writeToFile("a*b:"+jtextarearesult.getText()); } } }); this.rightpanel.add(cheng); JButton chu=new JButton("除"); chu.setBounds(0,255,100,40); chu.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent arg0) { if(null!=a&&null!=b){ setStartTime(System.currentTimeMillis()); //jtextarearesult.setText("尚未实现"); try { jtextarearesult.setText(a.divide(b).toString()); } catch (Exception e) { writeToFile(e.toString()); } setEndTime(System.currentTimeMillis()); timeshow.setText((end-start)+""); } } }); this.rightpanel.add(chu); this.buttomjpanel.add(this.rightpanel); this.add(this.buttomjpanel); } public void writeToFile(String s){ File f = new File("./log.txt"); Date d = new Date(); try{ BufferedWriter bf = new BufferedWriter(new FileWriter(f,true)); bf.write(d.toLocaleString()); bf.write(s); bf.close(); }catch(IOException e){ e.printStackTrace();} } public static void main(String args[]){ new WinFrame(); } }