我这段java代码错在哪？

import javax.swing.*;
<br>import java.awt.*;
<br>public class JiSuanJi extends JFram{
<br> pritvate JTextField text1;
<br> pritvate JButton btnBackspace;
<br> pritvate JButton btnCE;
<br> pritvate JButton btnC;
<br> pritvate JButton btnMC;
<br> pritvate JButton btnMR;
<br> pritvate JButton btnMS;
<br> pritvate JButton btnM1;
<br> pritvate JButton btn1;
<br> pritvate JButton btn2;
<br> pritvate JButton btn3;
<br> pritvate JButton btn4;
<br> pritvate JButton btn5;
<br> pritvate JButton btn6;
<br> pritvate JButton btn7;
<br> pritvate JButton btn8;
<br> pritvate JButton btn9;
<br> pritvate JButton btn0;
<br>   pritvate JButton btnP;
<br> pritvate JButton btnM;
<br> pritvate JButton btnMu;
<br> pritvate JButton btnD;
<br> pritvate JButton btnQuYu;
<br> pritvate JButton btnDian;
<br> pritvate JButton btnDeng;
<br> pritvate JButton btnX;
<br> pritvate JButton btnSqrt;
<br> pritvate JButton btnMMu;
<br> private JPanel p1,p2,p3,p4,p5,p6;
<br>
<br>     public JiSuanJi(){
<br>         createComponents();
<br>         layoutComponents();
<br>         setTitle("第一个图形界面");
<br>         setDefaultCloseOperation(JFrame.EDXIT_ON_CLOSE);
<br>         pack();
<br>     }
<br>     
<br>     private void createComponention(){
<br> text1=new JTextField(10);
<br> btnBackspace=new JButton("backspace");
<br> btnCE=new JButton("CE");
<br> btnC=new JButton("C");
<br> btnMC=new JButton("MC");
<br> btnMR=new JButton("MR");
<br> btnMS=new JButton("MS");
<br> btnM1=new JButton("M+");
<br> btn1=new JButton("1");
<br> btn2=new JButton("2");
<br> btn3=new JButton("3");
<br> btn4=new JButton("4");
<br> btn5=new JButton("5");
<br> btn6=new JButton("6");
<br> btn7=new JButton("7");
<br> btn8=new JButton("8");
<br> btn9=new JButton("9");
<br> btn0=new JButton("0");
<br> btnP=new JButton("+");
<br> btnM=new JButton("-");
<br> btnMu=new JButton("*");
<br> btnD=new JButton("/");
<br> btnQuYu=new JButton("%");
<br> btnDian=new JButton(".");
<br> btnDeng=new JButton("=");
<br> btnX=new JButton("1/x");
<br> btnSqrt=new JButton("sqrt");
<br> btnMMu=new JButton("+/-");
<br> p1=new JPanel();
<br> p2=new JPanel();
<br> p3=new JPanel();
<br> p4=new JPanel();
<br> p5=new JPanel();
<br> p6=new JPanel();
<br>    }
<br>   
<br>
<br>    private void layoutComponents(){
<br> Container c=this.getContentPane();
<br> c.setLayout(new GridLayout(6,1));
<br> c.add(p1);
<br> c.add(p2);
<br> c.add(p3);
<br> c.add(p4);
<br> c.add(p5);
<br> c.add(p6);
<br> p1.add(text1);
<br> p2.add(btnBackspace,btnCE,btnC);
<br> p3.add(btnMC,btn7,btn8,btn9,btnD,btnSqrt);
<br> p4.add(btnMR,btn4,btn5,btn6,btnMu,btnQuYu);
<br> p5.add(btnMS,btn1,btn2,btn3,btnM,btnX);
<br> p6.add(btnM1,btn0,btnMMu,btnDian,btnM,btnDeng);
<br>   }      
<br>
<br>
<br>    public static void main(String[] args){
<br> JFrame.setDefaultLookAndFeelDecorated(true);
<br> JiSuanJi frame=new FirstJFrame();
<br> frame.setVisible(true);
<br>    }
<br>
<br>
<br>
<br>}
<br>错误提示 是 需要表式符（不是全角半角错误）

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