java界面编程初探

java界面编程初探

一个简易计算器的实现，只能对整数进行加减乘除运算（写的很乱）

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

public class ButtonTest {
    public static void main(String[] args) {
        int[] num = new int[100];
        boolean isys=false;
        Event event=new Event();
        event.btn_event();
    }
}

class Event
{
    private boolean isys=false;
    private int[] num=new int[100];
    Interface f=new Interface();
    int ysfh=-1;
    public void btn_event()
    {
        f.btn[0].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                f.num.setText(f.num.getText()+"1");
                if(!isys)
                    num[0]=Integer.parseInt(f.num.getText());
                else num[1]=Integer.parseInt(f.num.getText());
            }
        });
        f.btn[1].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                f.num.setText(f.num.getText()+"2");
                if(!isys)
                    num[0]=Integer.parseInt(f.num.getText());
                else num[1]=Integer.parseInt(f.num.getText());
            }
        });
        f.btn[2].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                f.num.setText(f.num.getText()+"3");
                if(!isys)
                    num[0]=Integer.parseInt(f.num.getText());
                else num[1]=Integer.parseInt(f.num.getText());
            }
        });
        //加
        f.btn[3].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                f.num.setText("");
                isys=true;
                ysfh=1;

            }
        });
        f.btn[4].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                f.num.setText(f.num.getText()+"4");
                if(!isys)
                    num[0]=Integer.parseInt(f.num.getText());
                else num[1]=Integer.parseInt(f.num.getText());
            }
        });
        f.btn[5].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                f.num.setText(f.num.getText()+"5");
                if(!isys)
                    num[0]=Integer.parseInt(f.num.getText());
                else num[1]=Integer.parseInt(f.num.getText());
            }
        });
        f.btn[6].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                f.num.setText(f.num.getText()+"6");
                if(!isys)
                    num[0]=Integer.parseInt(f.num.getText());
                else num[1]=Integer.parseInt(f.num.getText());
            }
        });
        //减
        f.btn[7].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                f.num.setText("");
                isys=true;
                ysfh=2;
            }
        });
        f.btn[8].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                f.num.setText(f.num.getText()+"7");
                if(!isys)
                    num[0]=Integer.parseInt(f.num.getText());
                else num[1]=Integer.parseInt(f.num.getText());
            }
        });
        f.btn[9].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                f.num.setText(f.num.getText()+"8");
                if(!isys)
                    num[0]=Integer.parseInt(f.num.getText());
                else num[1]=Integer.parseInt(f.num.getText());
            }
        });
        f.btn[10].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                f.num.setText(f.num.getText()+"9");
                if(!isys)
                    num[0]=Integer.parseInt(f.num.getText());
                else num[1]=Integer.parseInt(f.num.getText());
            }
        });
        //乘
        f.btn[11].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                f.num.setText("");
                isys=true;
                ysfh=3;
            }
        });
        f.btn[12].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                f.num.setText(f.num.getText()+"0");
                if(!isys)
                    num[0]=Integer.parseInt(f.num.getText());
                else num[1]=Integer.parseInt(f.num.getText());
            }
        });
        //清除
        f.btn[13].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                f.num.setText("");
                num[0]=0;
                num[1]=0;
                ysfh=-1;
                isys=false;
            }
        });
        //等于
        f.btn[14].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {            
                if(isys)
                {
                    switch(ysfh)
                    {
                    case 1:{f.num.setText(Integer.toString(num[0]+num[1]));num[0]=0;num[1]=0;ysfh=-1;isys=false;}
                    case 2:{f.num.setText(Integer.toString(num[0]-num[1]));num[0]=0;num[1]=0;ysfh=-1;isys=false;}
                    case 3:{f.num.setText(Integer.toString(num[0]*num[1]));num[0]=0;num[1]=0;ysfh=-1;isys=false;}
                    case 4:{f.num.setText(Float.toString(num[0]/num[1]));num[0]=0;num[1]=0;ysfh=-1;isys=false;}
                    }                                   
                }
            }
        });
        //除
        f.btn[15].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                f.num.setText("");
                isys=true;
                ysfh=4;
            }
        });



        f.show();
    }


}

class Interface
{
    public JButton[] btn = new JButton[20];
    public JTextArea num=new JTextArea(1, 30);
    private JFrame frame= new JFrame("My First Frame");
    public Interface()
    {

        JPanel panel_input=new JPanel();//输入区域
        JPanel panel_numbers=new JPanel();//数字区域
        String[] str={"1","2","3","+","4","5","6","-","7","8","9","×","0","C","=","÷"}; 
        //初始化窗体
        frame.setSize(400, 300);
        frame.setLayout(null);  
        //创建文本区域

        num.setFont(new Font("黑体",4, 25));
        panel_input.setBounds(0, 0, 400, 30);
        panel_input.add(num,BorderLayout.WEST); 
        //按钮
        for(int i=0;i<str.length;i++)
        {
            btn[i]=new JButton(str[i]);
            panel_numbers.add(btn[i]);
        }
        panel_numbers.setBounds(0, 4``, 375, 250);
        panel_numbers.setLayout(new GridLayout(5,4));
        panel_numbers.setVisible(true);
        frame.add(panel_input);
        frame.add(panel_numbers);

    }
    public void show()
    {
        frame.setVisible(true);
    }
}

运行截图：