解释这个程序的作用import java.awt.Color;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

class JF extends JFrame{
    public JF(String s){
        super(s);
        this.setLayout(null);
        this.setSize(700,400);;//设置窗口的位置以及大小
        this.setBackground(Color.pink); //为窗体设置颜色
        ////设置退出应用程序
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}



class JP1 extends JPanel{
    public JP1 () {
        this.setSize(700,700);//设置画布的位置以及大小
        this.setBackground(Color.gray);
        init();
    }

    private void init() {
        // TODO Auto-generated method stub
        setLayout(null); //清空布局管理器

        //布局一
        JLabel title=new JLabel("SM4 + CBC算法加密解密演示");//设置标签
        title.setBounds(200,0,400,15);//设置title的位置，大小
        add(title);//添加进容器

        //分组1
        JLabel IV11=new JLabel("IV1");
        IV11.setBounds(0, 30, 20, 20);
        JTextField IV1=new JTextField(10);
        IV1.setBounds(25, 30, 100, 20);
        add(IV11);
        add(IV1);

        JLabel xor1=new JLabel("xor");
        xor1.setBounds(50, 50, 20, 20);
        add(xor1);

        JLabel string11=new JLabel("pt1");
        string11.setBounds(0, 70, 20, 20);
        JTextField string1=new JTextField(10);
        string1.setBounds(25, 70, 100, 20);
        add(string11);
        add(string1);

        JButton button1 = new JButton("加密1");
        button1.setBounds(30,110,80,20);
        add(button1);

        JLabel string55=new JLabel("ct1");
        string55.setBounds(0, 140, 20, 20);
        JTextField string5=new JTextField(10);
        string5.setBounds(25, 140, 100, 20);
        add(string55);
        add(string5);

        JButton button5 = new JButton("解密1");
        button5.setBounds(30,170,80,20);
        add(button5);

        JLabel xor5=new JLabel("xor");
        xor5.setBounds(50, 200, 20, 20);
        add(xor5);

        JLabel IV55=new JLabel("IV1");
        IV55.setBounds(50, 230, 20, 20);
        add(IV55);

        JLabel string99=new JLabel("pt1");
        string99.setBounds(0, 260, 20, 20);
        JTextField string9=new JTextField(10);
        string9.setBounds(25, 260, 100, 20);
        add(string99);
        add(string9);


        //分组2
        JLabel IV22=new JLabel("IV2");
        IV22.setBounds(150, 30, 20, 20);
        JTextField IV2=new JTextField(10);
        IV2.setBounds(175, 30, 100, 20);
        add(IV22);
        add(IV2);

        JLabel xor2=new JLabel("xor");
        xor2.setBounds(200, 50, 20, 20);
        add(xor2);

        JLabel string22=new JLabel("pt2");
        string22.setBounds(150, 70, 20, 20);
        JTextField string2=new JTextField(10);
        string2.setBounds(175, 70, 100, 20);
        add(string22);
        add(string2);

        JButton button2 = new JButton("加密2");
        button2.setBounds(180,110,80,20);
        add(button2);

        JLabel string66=new JLabel("ct2");
        string66.setBounds(150, 140, 20, 20);
        JTextField string6=new JTextField(10);
        string6.setBounds(175, 140, 100, 20);
        add(string66);
        add(string6);

        JButton button6 = new JButton("解密2");
        button6.setBounds(180,170,80,20);
        add(button6);

        JLabel xor6=new JLabel("xor");
        xor6.setBounds(200, 200, 20, 20);
        add(xor6);

        JLabel IV66=new JLabel("IV1");
        IV66.setBounds(200, 230, 20, 20);
        add(IV66);

        JLabel stringaa=new JLabel("pt2");
        stringaa.setBounds(150, 260, 20, 20);
        JTextField stringa=new JTextField(10);
        stringa.setBounds(175, 260, 100, 20);
        add(stringaa);
        add(stringa);


        //分组3
        JLabel IV33=new JLabel("IV3");
        IV33.setBounds(300, 30, 20, 20);
        JTextField IV3=new JTextField(10);
        IV3.setBounds(325, 30, 100, 20);
        add(IV33);
        add(IV3);

        JLabel xor3=new JLabel("xor");
        xor3.setBounds(350, 50, 20, 20);
        add(xor3);

        JLabel string33=new JLabel("pt3");
        string33.setBounds(300, 70, 20, 20);
        JTextField string3=new JTextField(10);
        string3.setBounds(325, 70, 100, 20);
        add(string33);
        add(string3);

        JButton button3 = new JButton("加密3");
        button3.setBounds(330,110,80,20);
        add(button3);

        JLabel string77=new JLabel("ct3");
        string77.setBounds(300, 140, 20, 20);
        JTextField string7=new JTextField(10);
        string7.setBounds(325, 140, 100, 20);
        add(string77);
        add(string7);

        JButton button7 = new JButton("解密3");
        button7.setBounds(330,170,80,20);
        add(button7);

        JLabel xor7=new JLabel("xor");
        xor7.setBounds(350, 200, 20, 20);
        add(xor7);

        JLabel IV77=new JLabel("IV1");
        IV77.setBounds(350, 230, 20, 20);
        add(IV77);

        JLabel stringbb=new JLabel("pt3");
        stringbb.setBounds(300, 260, 20, 20);
        JTextField stringb=new JTextField(10);
        stringb.setBounds(325, 260, 100, 20);
        add(stringbb);
        add(stringb);


        //分组4
        JLabel IV44=new JLabel("IV4");
        IV44.setBounds(450, 30, 20, 20);
        JTextField IV4=new JTextField(10);
        IV4.setBounds(475, 30, 100, 20);
        add(IV44);
        add(IV4);

        JLabel xor4=new JLabel("xor");
        xor4.setBounds(500, 50, 20, 20);
        add(xor4);

        JLabel string44=new JLabel("pt4");
        string44.setBounds(450, 70, 20, 20);
        JTextField string4=new JTextField(10);
        string4.setBounds(475, 70, 100, 20);
        add(string44);
        add(string4);

        JButton button4 = new JButton("加密4");
        button4.setBounds(480,110,80,20);
        add(button4);

        JLabel string88=new JLabel("ct4");
        string88.setBounds(450, 140, 20, 20);
        JTextField string8=new JTextField(10);
        string8.setBounds(475, 140, 100, 20);
        add(string88);
        add(string8);

        JButton button8 = new JButton("解密4");
        button8.setBounds(480,170,80,20);
        add(button8);

        JLabel xor8=new JLabel("xor");
        xor8.setBounds(500, 200, 20, 20);
        add(xor8);

        JLabel IV88=new JLabel("IV1");
        IV88.setBounds(500, 230, 20, 20);
        add(IV88);

        JLabel stringcc=new JLabel("pt4");
        stringcc.setBounds(450, 260, 20, 20);
        JTextField stringc=new JTextField(10);
        stringc.setBounds(475, 260, 100, 20);
        add(stringcc);
        add(stringc);


        //
        JLabel key1=new JLabel("key");
        key1.setBounds(575, 90, 20, 20);
        JTextField key=new JTextField(10);
        key.setBounds(600, 90, 100, 20);
        add(key);
        add(key1);


        //设置监听事件
        button1.addActionListener(E1->{
            byte[] KEY = key.getText().getBytes();//获取文本，转换成字节存储在数组KEY
            byte[] IV = IV1.getText().getBytes();
            SM4CBC ss1 = new SM4CBC(KEY,IV);
            byte[] input = string1.getText().getBytes();
            byte[] encript1 = ss1.encrypt(input);
            IV2.setText(hex(encript1));
            string5.setText(hex(encript1));

        });
        button5.addActionListener(E1->{
            byte[] KEY = key.getText().getBytes();
            byte[] IV = IV1.getText().getBytes();
            SM4CBC ss1 = new SM4CBC(KEY,IV);
            byte[] input = hexStringToBytes(string5.getText());//将文本转为16进制字节
            byte[] decript1 = ss1.decrypt(input);
            string9.setText(new String(decript1));

        });
        button2.addActionListener(E1->{
            byte[] KEY = key.getText().getBytes();
            byte[] IV = hexStringToBytes(IV2.getText());
            SM4CBC ss1 = new SM4CBC(KEY,IV);
            byte[] input = string2.getText().getBytes();
            byte[] encript1 = ss1.encrypt(input);
            IV3.setText(hex(encript1));
            string6.setText(hex(encript1));

        });
        button6.addActionListener(E1->{
            byte[] KEY = key.getText().getBytes();
            byte[] IV = hexStringToBytes(IV2.getText());
            SM4CBC ss1 = new SM4CBC(KEY,IV);
            byte[] input = hexStringToBytes(string6.getText());
            byte[] decript1 = ss1.decrypt(input);
            stringa.setText(new String(decript1));

        });
        button3.addActionListener(E1->{
            byte[] KEY = key.getText().getBytes();
            byte[] IV = hexStringToBytes(IV3.getText());
            SM4CBC ss1 = new SM4CBC(KEY,IV);
            byte[] input = string3.getText().getBytes();
            byte[] encript1 = ss1.encrypt(input);
            IV4.setText(hex(encript1));
            string7.setText(hex(encript1));

        });
        button7.addActionListener(E1->{
            byte[] KEY = key.getText().getBytes();
            byte[] IV = hexStringToBytes(IV3.getText());
            SM4CBC ss1 = new SM4CBC(KEY,IV);
            byte[] input = hexStringToBytes(string7.getText());
            byte[] decript1 = ss1.decrypt(input);
            stringb.setText(new String(decript1));

        });
        button4.addActionListener(E1->{
            byte[] KEY = key.getText().getBytes();
            byte[] IV = hexStringToBytes(IV4.getText());
            SM4CBC ss1 = new SM4CBC(KEY,IV);
            byte[] input = string4.getText().getBytes();
            byte[] encript1 = ss1.encrypt(input);
            string8.setText(hex(encript1));

        });
        button8.addActionListener(E1->{
            byte[] KEY = key.getText().getBytes();
            byte[] IV = hexStringToBytes(IV4.getText());
            SM4CBC ss1 = new SM4CBC(KEY,IV);
            byte[] input = hexStringToBytes(string8.getText());
            byte[] decript1 = ss1.decrypt(input);
            stringc.setText(new String(decript1));

        });

    }

    //
    public static String hex(byte[] bytes) {
        StringBuilder result = new StringBuilder();
        for (byte aByte : bytes) {
            result.append(String.format("%02x", aByte));

        }
        return result.toString();
    }

    //
    public static byte[] hexStringToBytes(String hex) {
        byte[] bytes = new byte[hex.length() / 2];
        for (int i = 0; i < bytes.length; i++) {
            bytes[i] = (byte) Integer.parseInt(hex.substring(i * 2, i * 2 + 2), 16);
        }
        return bytes;
    }
}



public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        //界面设计
        //创建窗口和画布
        JF jf1=new JF("SM4算法演示");
        JP1 jp=new JP1();
        jf1.add(jp);
        jf1.setVisible(true);
    }

}