Java 简易计算器代码(只能整数的简易运算)

package tools;

import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Arrays;

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

/*
 * 计算器
 */
public class Calculator extends JFrame {
    private String szz1 = "", szz2 = "";
    private String fuhao = "";
    private JTextField jtField;
    int a,b;
    Acbutton acbutton;

    public Calculator() {
        this.setTitle("计算器");
        this.setSize(280, 320);
        this.setLocation(300, 200);
        this.setResizable(false);
        this.setLayout(null);
        // 调用插入显示框方法
        this.addview();
        // 调用插入按钮方法
        this.addbutton();
        this.setVisible(true);

    }

    // 插入显示框
    private void addview() {
        jtField = new JTextField("0");
        jtField.setBounds(5, 5, 340, 50);
        // 设置不可编辑
        jtField.setEditable(false);
        // 设置背景和字体
        jtField.setBackground(new Color(241, 241, 241, 255));
        jtField.setFont(new Font("宋体", Font.BOLD, 16));
        add(jtField);

    }

    // 插入按钮
    private void addbutton() {
        acbutton = new Acbutton();
        JButton B1, B2, B3, B4, B5, B6, B7, B8, B9, B0, Bf1, Bf2, Bf3, Bf4, Bf5, bC;
        B1 = new JButton("1");
        B2 = new JButton("2");
        B3 = new JButton("3");
        B4 = new JButton("4");
        B5 = new JButton("5");
        B6 = new JButton("6");
        B7 = new JButton("7");
        B8 = new JButton("8");
        B9 = new JButton("9");
        B0 = new JButton("0");
        Bf1 = new JButton("+");
        Bf2 = new JButton("-");
        Bf3 = new JButton("*");
        Bf4 = new JButton("/");
        Bf5 = new JButton("=");
        bC = new JButton("C");
        B1.addActionListener(acbutton);
        B2.addActionListener(acbutton);
        B3.addActionListener(acbutton);
        B4.addActionListener(acbutton);
        B5.addActionListener(acbutton);
        B6.addActionListener(acbutton);
        B7.addActionListener(acbutton);
        B8.addActionListener(acbutton);
        B9.addActionListener(acbutton);
        B0.addActionListener(acbutton);
        Bf1.addActionListener(acbutton);
        Bf2.addActionListener(acbutton);
        Bf3.addActionListener(acbutton);
        Bf4.addActionListener(acbutton);
        Bf5.addActionListener(acbutton);
        bC.addActionListener(acbutton);
        // 第一排按键1,2,3,+
        B1.setBounds(5, 60, 60, 50);
        B2.setBounds(70, 60, 60, 50);
        B3.setBounds(135, 60, 60, 50);
        Bf1.setBounds(200, 60, 60, 50);
        // 第二排按键4,5,6,-
        B4.setBounds(5, 115, 60, 50);
        B5.setBounds(70, 115, 60, 50);
        B6.setBounds(135, 115, 60, 50);
        Bf2.setBounds(200, 115, 60, 50);
        // 第三排按键7,8,9,*
        B7.setBounds(5, 170, 60, 50);
        B8.setBounds(70, 170, 60, 50);
        B9.setBounds(135, 170, 60, 50);
        Bf3.setBounds(200, 170, 60, 50);
        // 第四排按键C(清空输入的内容),0,=,/
        bC.setBounds(5, 225, 60, 50);
        B0.setBounds(70, 225, 60, 50);
        Bf5.setBounds(135, 225, 60, 50);
        Bf4.setBounds(200, 225, 60, 50);
        add(B1);
        add(B2);
        add(B3);
        add(Bf1);
        add(B4);
        add(B5);
        add(B6);
        add(Bf2);
        add(B7);
        add(B8);
        add(B9);
        add(Bf3);
        add(bC);
        add(B0);
        add(Bf5);
        add(Bf4);
    }

    class Acbutton implements ActionListener {
        // 监控按键被触发
        public void actionPerformed(ActionEvent e) {
            JButton btn = (JButton) e.getSource();
            String Sbin = btn.getText();
            String[] sz = { "1", "2", "3", "4", "5", "6", "7", "8", "9" };
            long i = Arrays.binarySearch(sz, Sbin);
            if (i >= 0) { // 点击按键为1~9的数字将数字加入字符串1
                szz1 = szz1 + Sbin;
            } else if (szz1 != "" && Sbin.equals("0")) { // 值为空时不能输入零
                szz1 = szz1 + "0";
            } else if (Sbin.equals("+") || Sbin.equals("-") || Sbin.equals("*") || Sbin.equals("/")) { // 判断输入是否运算符
                if (fuhao.equals("")) { // 输入运算符时,运算符字符串为空则将输入的运算符赋值给运算符字符串,将字符串1的值赋值给字符串2,并清空字符串1,
                    szz2 = szz1;
                    szz1 = "";
                    fuhao = Sbin;
                } else if (fuhao.equals("+") || fuhao.equals("-") || fuhao.equals("*") || fuhao.equals("/")) { // 判断输入运算符时运算符字符串不为空
                    if (szz1.equals("")) { // 判断字符串1为空,将新输入运算符替换原运算符字符串字符
                        fuhao = Sbin;
                    } else if (szz2.equals("")) { // 字符串1不为空,字符串2为空,将字符串2值作为0进行运算
                        a = 0;
                        b = Integer.parseInt(szz1);
                        szz1 = "";
                        if (fuhao.equals("+")) {
                            szz2 = (a + b) + "";
                        } else if (fuhao.equals("-")) {
                            szz2 = (a - b) + "";
                        } else if (fuhao.equals("*")) {
                            szz2 = (a * b) + "";
                        } else if (fuhao.equals("/")) {
                            szz2 = (a / b) + "";
                        }
                        a=0;
                        b=0;
                        fuhao = Sbin;
                    } else { // 字符串1,2不为空,运算符字符串有字符,将原式运算后值存入字符串2,将新输入运算符存入运算符字符串,
                        a = Integer.parseInt(szz2);
                        b = Integer.parseInt(szz1);
                        szz1 = "";
                        if (fuhao.equals("+")) {
                            szz2 = (a + b) + "";
                        } else if (fuhao.equals("-")) {
                            szz2 = (a - b) + "";
                        } else if (fuhao.equals("*")) {
                            szz2 = (a * b) + "";
                        } else if (fuhao.equals("/")) {
                            szz2 = (a / b) + "";
                        }
                        a=0;
                        b=0;
                        fuhao = Sbin;
                    }
                }
            } else if (Sbin.equals("=")) { // =按钮被点击监控,
                if (fuhao.equals("")) { // =被点击时判断有没有运算符号被存入;有运算符号根据输入的运算符号进行计算
                } else if (fuhao.equals("+") || fuhao.equals("-") || fuhao.equals("*") || fuhao.equals("/")) {
                    if (szz1.equals("")) { // 字符串1没有值时,将字符串2值赋值给字符串1值输出
                        szz1 = szz2;
                        szz2 = "";
                        fuhao = "";
                    } else if (szz2.equals("")) { // 字符串2为空,将字符串2值作为0进行运算
                        a = 0;
                        b = Integer.parseInt(szz1);
                        szz2 = "";
                        if (fuhao.equals("+")) { // 根据输入的运算符号进行计算
                            szz1 = (a + b) + "";
                        } else if (fuhao.equals("-")) {
                            szz1 = (a - b) + "";
                        } else if (fuhao.equals("*")) {
                            szz1 = (a * b) + "";
                        } else if (fuhao.equals("/")) {
                            szz1 = (a / b) + "";
                        }
                        a=0;
                        b=0;
                        fuhao="";
                    } else {
                        a = Integer.parseInt(szz2);
                        b = Integer.parseInt(szz1);
                        szz2 = "";
                        if (fuhao.equals("+")) { // 根据输入的运算符号进行计算
                            szz1 = (a + b) + "";
                        } else if (fuhao.equals("-")) {
                            szz1 = (a - b) + "";
                        } else if (fuhao.equals("*")) {
                            szz1 = (a * b) + "";
                        } else if (fuhao.equals("/")) {
                            szz1 = (a / b) + "";
                        }
                        a=0;
                        b=0;
                        fuhao="";
                    }
                }
            } else if (Sbin.equals("C")) { // C按钮监控,清空所有内容
                szz1 = "";
                szz2 = "";
                fuhao = "";
            }
            jtField.setText(szz1);
        }
    }

    public static void main(String[] args) {
        new Calculator();
    }
}