技術標籤：Java swing入門之路javaswing前端

package pageDesign;

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

public class calPage {
    public void getInfo(String infoAll,JLabel jl){
        for (int i =0;i<count;i++
 
) {
            infoAll = infoAll + click.get(i);
        }
        jl.setText(infoAll);
    }//獲取陣列資訊並顯示在JLabel中
    public void getValue(JButton jb,JLabel jl){
        jb.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String infoAll =
 
 "";
                ArrayList<Double> intNone = new ArrayList<>();//空Double陣列，方便置零
                ArrayList<String> none = new ArrayList<>();//空String陣列，方便置零
                String input = jb.getText();//獲取點選按鈕的文字
                if (input == "CE") {
                    click =
 
 none;
                    infoAll = "";
                    jl.setText(infoAll);
                }//按到清空鍵後的函式
                else if(input == "Del") {
                    if(count>0)//當陣列內有資料
                    {
                        infoAll="";
                        click.remove(--count);
                        getInfo(infoAll,jl);
                    }
                    else {//當陣列內無資料
                        jl.setText("目前輸入為空");
                    }
                }//按到刪除鍵後的函式
                else if(input != "Del"&&input!="CE"&&input!="+"&&input!="-"&&input!="*"&&input!="/"&&input!="="){
                    click.add(input);
                    count++;
                     getInfo(infoAll,jl);
                }//正常識別數字按鈕數值
                else if(input=="+"||input=="-"||input=="*"||input=="/"){
                click.add(input);
                double s = 0;
                String extra="";
                for(int i = count-1;i>=0;i--)
                {
                    extra = extra + click.get(i);
                }//獲取前一段數字
                    s = Double.parseDouble(extra);
                cal.add(s);
                count1 = count;
                count++;
                getInfo(infoAll,jl);
            }//加減乘除四則運算
                else if(input == "="){
                    double s = 0;
                    String extra="";
                    for(int i = count1+1;i<count;i++)
                    {
                        extra = extra + click.get(i);
                    }//獲取後一段數字
                    s = Double.parseDouble(extra);
                    cal.add(s);
                    switch (click.get(count1))
                    {
                        case "+":s = cal.get(0)+cal.get(1);break;
                        case "-":s = cal.get(0)-cal.get(1);break;
                        case "*":s = cal.get(0)*cal.get(1);break;
                        case "/":s = cal.get(0)/cal.get(1);break;
                    }//switch判斷加減乘除符號
                    infoAll = Double.toString(s);
                    jl.setText(infoAll);
                    cal=intNone;
                    click=none;
                    count = 0;
                    count1 = 0;//全部置零
                }//等於鍵得數值
            }//新增按鈕監聽內容
        });
    }//獲取按鈕數值並進行進一步的計算

    int count = 0;
    int count1 = 0;
    static public ArrayList<Double> cal = new ArrayList<Double>();//需要計算的數值
    private JFrame calAll = new JFrame("計算器 作者：大W的幻想");//主容器
    private JPanel numberScr = new JPanel();//顯示數字屏
    private JPanel buttonScr = new JPanel();//顯示按鈕屏
    private JLabel screen = new JLabel();//顯示計算公式
    static public ArrayList<String> click = new ArrayList<String>();//儲存點選後的資料
    static public String[] sign = {"7","8","9","+","Del","4","5","6","-","CE","1","2","3","*","(","0",".","=","/",")"};//按鈕對應數值
    static private JButton buList = new JButton();//按鈕樣式
    public calPage(){
        calAll.setBounds(300,200,350,300);
        buttonScr.setLayout(new GridLayout(4,5,5,5));
        for(String info:sign){
            buList = new JButton(info);
            buttonScr.add(buList);
            getValue(buList,screen);
        }//構造所有按鈕
        numberScr.add(screen);
        calAll.add(numberScr,BorderLayout.NORTH);
        calAll.add(buttonScr, BorderLayout.SOUTH);
        calAll.setVisible(true);
        calAll.setResizable(false);
        calAll.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }//構造

}

差點忘了，這是主函式的內容

package com.company;
import pageDesign.calPage;
public class Main {
    public static void main(String[] args) {
       new calPage();
    }
}

因為我兩個函式分開來寫的

程式碼如上，一些新功能的新增會放在後面的部落格中。這個計算器還有（）的功能未加入，不過我會適時的修改以達到正常的使用