计算器的初步实现（一）

窗口的实现要用到JFrame，计算的实现要通过ActionListener

1.窗口的实现

public class calculatorLBW522
{
    public void showUI()
    {
        CalucOfaction ual = new CalucOfaction();
        JFrame jf = new JFrame();
        jf.setTitle("calculator");
        jf.setSize(210,240);
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        jf.setLocation(500,300);
        FlowLayout flow = new FlowLayout();
        jf.setLayout(flow);

        JTextField cOUT = new JTextField(30);

        JButton btnAC = new JButton("A");
        JButton btnsp = new JButton("=");
        JButton btnadd = new JButton("+");
        JButton btnleft = new JButton("(");
        JButton btnright = new JButton(")");
        JButton btn0 = new JButton("0");
        JButton btnp = new JButton(".");
        JButton btnCOM = new JButton("%");




        JButton[] btnNUM = new JButton[12];
        String[] labelNUMSTR = {"1","2","3","-","4","5","6","*","7","8","9","\\"};
        for(int i =0;i<btnNUM.length;i++)
        {
            btnNUM[i] = new JButton(labelNUMSTR[i]);
        }

        jf.add(cOUT);
        jf.add(btnAC);
        jf.add(btnsp);
        jf.add(btnCOM);
        jf.add(btnadd);

        cOUT.addActionListener(ual);
        btnAC.addActionListener(ual);
        btnsp.addActionListener(ual);
        btnCOM.addActionListener(ual);
        btnadd.addActionListener(ual);


        for(int i = 0; i< labelNUMSTR.length; i++)
        {

            jf.add(btnNUM[i]);
            btnNUM[i].addActionListener(ual);


        }

        jf.add(btn0);
        jf.add(btnp);//"."
        jf.add(btnleft);
        jf.add(btnright);

        btn0.addActionListener(ual);
        btnp.addActionListener(ual);
        btnleft.addActionListener(ual);
        btnright.addActionListener(ual);



        jf.setVisible(true);
        jf.setResizable(false);




    }

    public static void main(String[] args)
    {
        calculatorLBW522 cal = new calculatorLBW522();
        cal.showUI();
    }


}

2.具体功能的实现

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.util.Arrays;
import java.util.Date;
import java.awt.event.ActionListener;
import java.util.ArrayList;


public class CalucOfaction implements ActionListener
{
    ArrayList<String> strcmputeArr = new ArrayList<>();
    int[] num = new int[100];

    public void actionPerformed(ActionEvent e)
    {
        strcmputeArr.add(e.getActionCommand());
        System.out.println(strcmputeArr);
        if(e.getActionCommand().equals("A"))
        {
            strcmputeArr.clear();
            System.out.println("已清除，请重新计算");
        }
        else if (e.getActionCommand().equals("="))
        {

            String[] strcmputeStr = strcmputeArr.toArray(new String[0]);
            int result = cmpute(strcmputeStr);
            System.out.println(result);

        }

    }

    int BaseCompute(int num1,int num2,char a)
    {
        switch (a)
        {
            case '+':
                return num1 + num2;
            case '-':
                return num1 - num2;
            case '*':
                return num1 * num2;
            case '/':
                return num1 / num2;
            case '%':
                return num1 % num2;
            default:
                return 0;
        }


    }

    int cmpute(String[] str)
    {
        int[] num = new int[100]; //存放的数字
        int[] temp = new int[100];//中间结果
        int numi = 0;
        int numii = 0;
        int tempi = 0;
        int tempii = 0;
        int i = 0;//i代表字符串的位置


            char c0;
            if(str[i].equals("("))
            {
                i++;//移动到“（”后的位置
                num[numi++] = Integer.parseInt(str[i++]);//将“（”后的数字传递给num

                char c1 = str[i].charAt(0);
                i++;//移动到符合后的位置
                num[numi++] = Integer.parseInt(str[i++]);
                i++;//跳到“）”后的位置
                temp[tempi++] = BaseCompute(num[numi - 2], num[numi - 1],c1);
                numi -=2;

            }

            c0 = str[i].charAt(0);
            i++;

            if(str[i].equals("("))
            {
                i++;//移动到“（”后的位置
                num[numi++] = Integer.parseInt(str[i++]);//将“（”后的数字传递给num

                char c1 = str[i].charAt(0);
                i++;//移动到符合后的位置
                num[numi++] = Integer.parseInt(str[i++]);//将数字传递给num后，后移
                i++;//跳到“）”后的位置
                temp[tempi++] = BaseCompute(num[numi - 2], num[numi - 1],c1);
                numi -=2;
            }
                temp[tempi++] = BaseCompute(temp[tempi-3],temp[tempi-2],c0);





        return temp[tempi-1];
    }

}

注：初学者能力有限，只能实现最最*100基本的功能，欢迎大佬指正。