java简易计算器，计算器

package myPackage; import javax.swing.*; import java.awt.*; import java.awt.event.*; import javax.swing.event.*; import javax.swing.border.*; public class Calculator extends JFrame { int j=0,i=0, k=0;double sum=0;double[] a=new double[100];char[] b=new char[100]; public String str1="请输入计算公式（以等号结束）：",str2=""; JPanel p1=new JPanel(); JPanel p2=new JPanel(new BorderLayout()); public JTextField f=new JTextField(str1); public JButton jb1=new JButton(""+1); public JButton jb2=new JButton(""+2); public JButton jb3=new JButton(""+3); public JButton jb4=new JButton(""+4); public JButton jb5=new JButton(""+5); public JButton jb6=new JButton(""+6); public JButton jb7=new JButton(""+7); public JButton jb8=new JButton(""+8); public JButton jb9=new JButton(""+9); public JButton jb0=new JButton(""+0); public JButton jbAdd=new JButton("+"); public JButton jbSub=new JButton("-"); public JButton jbMul=new JButton("*"); public JButton jbDiv=new JButton("/"); public JButton jbIs=new JButton("="); public JButton jbRs=new JButton("Reset"); public Calculator() { ActionListener listener=new jbListener(); p1.setLayout(new GridLayout(4,4,10,10));//创建软键盘 p1.add(jb1); jb1.addActionListener(listener); p1.add(jb2); jb2.addActionListener(listener); p1.add(jb3); jb3.addActionListener(listener); p1.add(jb4); jb4.addActionListener(listener); p1.add(jb5); jb5.addActionListener(listener); p1.add(jb6); jb6.addActionListener(listener); p1.add(jb7); jb7.addActionListener(listener); p1.add(jb8); jb8.addActionListener(listener); p1.add(jb9); jb9.addActionListener(listener); p1.add(jb0); jb0.addActionListener(listener); p1.add(jbAdd);jbAdd.addActionListener(listener); p1.add(jbSub);jbSub.addActionListener(listener); p1.add(jbMul);jbMul.addActionListener(listener); p1.add(jbDiv);jbDiv.addActionListener(listener); p1.add(jbIs); jbIs.addActionListener(listener); p1.add(jbRs); jbRs.addActionListener(listener); p2.add(new JLabel("计算器面板"),BorderLayout.NORTH); p2.add(p1,BorderLayout.CENTER); add(p2,BorderLayout.EAST); add(f,BorderLayout.CENTER); } public void doCalculator(){ for(int p=0;p<100;p++) { a[p]=0; } str2=str2.trim(); for(i=0;i<str2.length();i++) { if(str2.charAt(i)<='9'&&str2.charAt(i)>='0') { a[j]=a[j]*10+(str2.charAt(i)-'0')+0.0; } else j=j+1; } for(i=0;i<str2.length();i++) { if(str2.charAt(i)>'9'||str2.charAt(i)<'0') { b[k]=str2.charAt(i); k=k+1; } } //for (i=0;i<=j;i++) //System.out.println(a[i]); //for (i=0;i<k;i++) //System.out.println(b[i]); //else //{ for(i=0;i<k;i++) { if(b[i]=='-') { a[i+1]=0-a[i+1]; b[i]='+'; } } if(b[0]=='*') { a[1]=a[0]*a[1]; a[0]=0.0; b[0]='+'; } else if(b[0]=='/') { a[1]=a[0]/a[1]; a[0]=0.0; b[0]='+'; } for(i=0;i<k;i++) { if(b[i]=='*') { a[i+1]=a[i]*a[i+1]; a[i]=0.0; b[i]='+'; } if(b[i]=='/') { a[i+1]=a[i]/a[i+1]; a[i]=0.0; b[i]='+'; } } for(i=0;i<99;i++) { sum+=a[i]; } //System.out.print(sum); str2=str2+'='+sum; f.setText(str2); } class jbListener implements ActionListener{ public void actionPerformed(ActionEvent e) { if(e.getSource()==jb1) { str2+="1"; f.setText(str2); return;} else if(e.getSource()==jb2) { str2+="2"; f.setText(str2); return;} else if(e.getSource()==jb3) { str2+="3"; f.setText(str2); return;} else if(e.getSource()==jb4) { str2+="4"; f.setText(str2);return;} else if(e.getSource()==jb5) { str2+="5"; f.setText(str2); return;} else if(e.getSource()==jb6) { str2+="6"; f.setText(str2); return;} else if(e.getSource()==jb7) { str2+="7"; f.setText(str2); return;} else if(e.getSource()==jb8) { str2+="8"; f.setText(str2); return;} else if(e.getSource()==jb9) { str2+="9"; f.setText(str2); return;} else if(e.getSource()==jb0) { str2+="0"; f.setText(str2); return;} else if(e.getSource()==jbAdd) { str2+="+"; f.setText(str2);return;} else if(e.getSource()==jbSub) { str2+="-"; f.setText(str2); return;} else if(e.getSource()==jbMul) { str2+="*"; f.setText(str2); return;} else if(e.getSource()==jbDiv) { str2+="/"; f.setText(str2); return;} else if (e.getSource()==jbIs) { f.setText(str2); doCalculator();return;} else {str2=" ";sum=0;j=0;k=0;f.setText(str2);} } } }