2016年java编写一个界面计算机实现

2016年10月28日

本程序基于Swing图形界面操作，创建图形界面步骤如下：

（1）.新建一个java项目
（2）.在新建的项目的包资源管理器中打开src，单击右键选择新建————》
     选择其他————》WindowBuilder————》Swing Designer————》
       JFrame————》点击下一步，输入名称————》点击完成。
（3）至此，完成了界面的搭建，接下来可以放置控件，进行后续步骤

一：从JTextFiled中获取数据

  变量名.getText();

二：往JTextFiled写入数据

  变量名.setText("字符串");
  String.valueOf(double型数据);//这是double型转为String类型

三：编程思路：

  1.放置10个按钮，分别为数字0~9，并为每个按钮设置监听器
  代码如下：
  package Hello;

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JList;
import javax.swing.JComboBox;
import javax.swing.JTextPane;

public class LoginFrame extends JFrame {

private JPanel contentPane;
private JTextField userNameC;
private JPasswordField passwordC;
private double num1=0;//要操作的第一个数字
private double num2=0;//要操作的第二个数字
private double count=0;//当有小数时，计数是第几位小数
private int dot=0;//监测是否输入了小数
private double result;//连个数操作的结果
private int sel=0;//选择器，选择进行了+、-、*、/、^中的那个操作，为0时表示还在输入第一位数
private boolean jisuan=false;//监测是否开始输入第二个数
private JTextField display;//定义显示窗口控件变量名为：display

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                LoginFrame frame = new LoginFrame();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

public  double zhishu(double x,double y){//正整数的指数次方
       if(y>0){
          return x*zhishu(x,y-1);
       }else if(y<0){
        return (x*zhishu(x,-y-1));
       }else{
       return 1;
       }
    }

public double fuzhishu(double x,double y){//负指数的指数次方
    double i=zhishu(x,y);
    return 1/i;
    }

public double x_n(double x,double y){//x^n计算
    if(y>0){
    return zhishu(x,y);
     }else if(y<0){
    return fuzhishu(x,y);
    }else{
    return 1;
    }
    }
public double jiecheng(double x){//计算阶乘
    if(x>1){
        return x*jiecheng(x-1);
    }
    else 
        return 1;
    }
public double deal_num1(double y){//对第一位操作数进行处理
        if(dot==0)
            num1=num1*10+y;
        else{
             count++;
             num1=num1+y/zhishu(10,count);
            }
        return 1;
}
public double deal_num2(double y){//对第二位数进行操作
if(jisuan==true){
    if(dot==0)
        num2=num2*10+y;
    else{
         count++;
         num2=num2+y/zhishu(10,count);
        }

}
return 1;

}

/**
 * Create the frame.
 */
public LoginFrame() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 450, 300);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    contentPane.setLayout(null);

    JLabel lblNewLabel = new JLabel("用户名");
    lblNewLabel.setBounds(10, 10, 54, 15);
    contentPane.add(lblNewLabel);

    userNameC = new JTextField();
    userNameC.setBounds(52, 7, 94, 21);
    contentPane.add(userNameC);
    userNameC.setColumns(10);

    JLabel lblNewLabel_1 = new JLabel("密 码");
    lblNewLabel_1.setBounds(10, 38, 54, 15);
    contentPane.add(lblNewLabel_1);

    passwordC = new JPasswordField();
    passwordC.setBounds(52, 35, 94, 21);
    contentPane.add(passwordC);

    JButton btnNewButton = new JButton("\u767B\u9646");
    btnNewButton.setBounds(20, 72, 64, 23);
    btnNewButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            System.out.println("单击了登陆按钮");
            System.out.println("输入的用户名是："+userNameC.getText());
            System.out.println("输入的密码是："+passwordC.getText());
        }
    });
    contentPane.add(btnNewButton);

    JButton btnNewButton_1 = new JButton("\u9000\u51FA");
    btnNewButton_1.setBounds(94, 72, 74, 23);
    btnNewButton_1.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            System.out.println("单击了退出按钮");
            System.out.println(userNameC.getText()+"成功退出了登陆！");
        }
    });
    contentPane.add(btnNewButton_1);

    JButton btnNewButton_2 = new JButton("1");//数字“1”按钮
    btnNewButton_2.setBounds(185, 6, 64, 23);
    btnNewButton_2.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
             deal_num2(1);//处理第二位数
            switch (sel){
            case 0:deal_num1(1);//处理第一位数
            System.out.println(num1);
                display.setText(String.valueOf(num1));
                break;
            case 1:display.setText(String.valueOf(num1+"+"+num2));break;
            case 2:display.setText(String.valueOf(num1+"-"+num2));break;
            case 3:display.setText(String.valueOf(num1+"*"+num2));break;
            case 4:display.setText(String.valueOf(num1+"/"+num2));break;
            case 5:display.setText(String.valueOf(num1+"^"+num2));break;
            }
        }
    });
    contentPane.add(btnNewButton_2);

    JButton button = new JButton("2");//数字“2”按钮
    button.setBounds(259, 6, 64, 23);
    button.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            deal_num2(2);
            switch (sel){
            case 0:
                 deal_num1(2);
                display.setText(String.valueOf(num1));break;
            case 1:display.setText(String.valueOf(num1+"+"+num2));break;
            case 2:display.setText(String.valueOf(num1+"-"+num2));break;
            case 3:display.setText(String.valueOf(num1+"*"+num2));break;
            case 4:display.setText(String.valueOf(num1+"/"+num2));break;
            case 5:display.setText(String.valueOf(num1+"^"+num2));break;
            }
        }
    });
    contentPane.add(button);

    JButton button_1 = new JButton("3");//数字“3”按钮
    button_1.setBounds(332, 6, 64, 23);
    button_1.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            deal_num2(3);
            switch (sel){
            case 0: deal_num1(3);
            display.setText(String.valueOf(num1));break;
            case 1:display.setText(String.valueOf(num1+"+"+num2));break;
            case 2:display.setText(String.valueOf(num1+"-"+num2));break;
            case 3:display.setText(String.valueOf(num1+"*"+num2));break;
            case 4:display.setText(String.valueOf(num1+"/"+num2));break;
            case 5:display.setText(String.valueOf(num1+"^"+num2));break;
            }
        }
    });
    contentPane.add(button_1);

    JButton button_2 = new JButton("4");//数字“4”按钮
    button_2.setBounds(185, 46, 64, 23);
    button_2.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            deal_num2(4);
            switch (sel){
            case 0:deal_num1(4);
                   display.setText(String.valueOf(num1));break;
            case 1:display.setText(String.valueOf(num1+"+"+num2));break;
            case 2:display.setText(String.valueOf(num1+"-"+num2));break;
            case 3:display.setText(String.valueOf(num1+"*"+num2));break;
            case 4:display.setText(String.valueOf(num1+"/"+num2));break;
            case 5:display.setText(String.valueOf(num1+"^"+num2));break;
            }
        }
    });
    contentPane.add(button_2);

    JButton button_3 = new JButton("5");//数字“5”按钮
    button_3.setBounds(259, 46, 64, 23);
    button_3.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            deal_num2(5);
            switch (sel){
            case 0:
                deal_num1(5);
                display.setText(String.valueOf(num1));break;
            case 1:display.setText(String.valueOf(num1+"+"+num2));break;
            case 2:display.setText(String.valueOf(num1+"-"+num2));break;
            case 3:display.setText(String.valueOf(num1+"*"+num2));break;
            case 4:display.setText(String.valueOf(num1+"/"+num2));break;
            case 5:display.setText(String.valueOf(num1+"^"+num2));break;
            }
        }
    });
    contentPane.add(button_3);

    JButton button_4 = new JButton("6");//数字“6”按钮
    button_4.setBounds(332, 46, 64, 23);
    button_4.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            deal_num2(6);
            switch (sel){
            case 0:
                deal_num1(6);
                display.setText(String.valueOf(num1));break;
            case 1:display.setText(String.valueOf(num1+"+"+num2));break;
            case 2:display.setText(String.valueOf(num1+"-"+num2));break;
            case 3:display.setText(String.valueOf(num1+"*"+num2));break;
            case 4:display.setText(String.valueOf(num1+"/"+num2));break;
            case 5:display.setText(String.valueOf(num1+"^"+num2));break;
            }
        }
    });
    contentPane.add(button_4);

    JButton button_5 = new JButton("7");//数字“7”按钮
    button_5.setBounds(185, 86, 64, 23);
    button_5.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            deal_num2(7);
            switch (sel){
            case 0:
                deal_num1(7);                   display.setText(String.valueOf(num1));break;
            case 1:display.setText(String.valueOf(num1+"+"+num2));break;
            case 2:display.setText(String.valueOf(num1+"-"+num2));break;
            case 3:display.setText(String.valueOf(num1+"*"+num2));break;
            case 4:display.setText(String.valueOf(num1+"/"+num2));break;
            case 5:display.setText(String.valueOf(num1+"^"+num2));break;
            }
        }
    });
    contentPane.add(button_5);

    JButton button_6 = new JButton("8");//数字“8”按钮
    button_6.setBounds(259, 86, 64, 23);
    button_6.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            deal_num2(8);
            switch (sel){
            case 0:
                deal_num1(8);
                display.setText(String.valueOf(num1));break;
            case 1:display.setText(String.valueOf(num1+"+"+num2));break;
            case 2:display.setText(String.valueOf(num1+"-"+num2));break;
            case 3:display.setText(String.valueOf(num1+"*"+num2));break;
            case 4:display.setText(String.valueOf(num1+"/"+num2));break;
            case 5:display.setText(String.valueOf(num1+"^"+num2));break;
            }
        }
    });
    contentPane.add(button_6);

    JButton button_7 = new JButton("9");//数字“9”按钮
    button_7.setBounds(332, 86, 64, 23);
    button_7.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            deal_num2(9);
            switch (sel){
            case 0:
                deal_num1(9);
                display.setText(String.valueOf(num1));break;
            case 1:display.setText(String.valueOf(num1+"+"+num2));break;
            case 2:display.setText(String.valueOf(num1+"-"+num2));break;
            case 3:display.setText(String.valueOf(num1+"*"+num2));break;
            case 4:display.setText(String.valueOf(num1+"/"+num2));break;
            case 5:display.setText(String.valueOf(num1+"^"+num2));break;
            }
        }
    });
    contentPane.add(button_7);

    JButton button_8 = new JButton("0");//“0”数字按钮
    button_8.setBounds(185, 119, 64, 23);
    button_8.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            deal_num2(0);
            switch (sel){
            case 0:
                deal_num1(0);
                display.setText(String.valueOf(num1));break;
            case 1:display.setText(String.valueOf(num1+"+"+num2));break;
            case 2:display.setText(String.valueOf(num1+"-"+num2));break;
            case 3:display.setText(String.valueOf(num1+"*"+num2));break;
            case 4:display.setText(String.valueOf(num1+"/"+num2));break;
            case 5:display.setText(String.valueOf(num1+"^"+num2));break;
            }
        }
    });
    contentPane.add(button_8);

    JButton button_9 = new JButton("+");//加法按钮
    button_9.setBounds(332, 119, 64, 23);
    button_9.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            display.setText(num1+"+");
            sel=1;
            dot=0;
            jisuan=true;
            count=0;
        }
    });
    contentPane.add(button_9);

    JButton button_10 = new JButton("-");//减法按钮
    button_10.setBounds(332, 152, 64, 23);
    button_10.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            display.setText(num1+"-");
            sel=2;dot=0;jisuan=true;
            count=0;
        }
    });
    contentPane.add(button_10);

    JButton button_11 = new JButton("=");//等于结果按钮
    button_11.setBounds(185, 152, 64, 42);
    button_11.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            switch (sel){
            case 0:display.setText(String.valueOf(result));break;
            case 1:result=num1+num2;display.setText(String.valueOf(num1+"+"+num2+"="+result));break;
            case 2:result=num1-num2;display.setText(String.valueOf(num1+"-"+num2+"="+result));break;
            case 3:result=num1*num2;display.setText(String.valueOf(num1+"*"+num2+"="+result));break;
            case 4:result=(double)num1/num2;display.setText(String.valueOf(num1+"/"+num2+"="+result));break;
            case 5:result=x_n(num1,num2);display.setText(String.valueOf(num1+"^"+num2+"="+result));break;
            }
            num1=num2=0;
            sel=0;
            dot=0;jisuan=false;count=0;
        }
    });
    contentPane.add(button_11);

    JButton button_12 = new JButton("/");//除法按钮
    button_12.setBounds(332, 218, 64, 23);
    button_12.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            display.setText(num1+"/");
            sel=4;
            dot=0;jisuan=true;
            count=0;
        }
    });
    contentPane.add(button_12);

    JButton button_13 = new JButton("*");//乘法按钮
    button_13.setBounds(332, 185, 64, 23);
    button_13.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            display.setText(num1+"*");
            sel=3;
            dot=0;
            jisuan=true;
            count=0;
        }
    });
    contentPane.add(button_13);

    JButton btnNewButton_3 = new JButton("C");//清空显示窗口按钮
    btnNewButton_3.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            display.setText("");
            num1=num2=0;
            jisuan=false;
            count=0;
            dot=0;
        }
    });
    btnNewButton_3.setBounds(185, 204, 64, 36);
    contentPane.add(btnNewButton_3);

    display = new JTextField();//显示输入、输出和结果的控件
    display.setBounds(10, 115, 158, 51);
    contentPane.add(display);
    display.setColumns(10);

    JButton sqrtC = new JButton("sqrt");//开平方操作
    sqrtC.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            result=Math.sqrt(num1);
            display.setText(String.valueOf("sqrt("+num1+")"+"="+result));
            num1=0;
            count=0;
            dot=0;
        }
    });
    sqrtC.setBounds(259, 152, 64, 23);
    contentPane.add(sqrtC);

    JButton btnNewButton_5 = new JButton("x^n");//任意次方操作
    btnNewButton_5.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            display.setText(num1+"^");
            sel=5;
            dot=0;
            count=0;
            jisuan=true;
        }
    });
    btnNewButton_5.setBounds(259, 182, 64, 23);
    contentPane.add(btnNewButton_5);

    JButton btnNewButton_4 = new JButton(".");//小数点
    btnNewButton_4.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            dot=1;
        }
    });
    btnNewButton_4.setBounds(259, 119, 64, 23);
    contentPane.add(btnNewButton_4);

    JButton btnNewButton_6 = new JButton("!");//阶乘运算
    btnNewButton_6.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            result=jiecheng(num1);
            display.setText(String.valueOf(num1+"!"+"="+result));
            num1=0;
            dot=0;
            count=0;
        }
    });
    btnNewButton_6.setBounds(259, 218, 64, 23);
    contentPane.add(btnNewButton_6);
}

}