java swing实现简单计算器

 

代码重复率太高了，应该优化一下的，没时间了，呵呵。

setActionCommand() 方法可以大大减少代码量。

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Test1 {
    public static void main(String[] args) {
        Calculator c = new Calculator();
        c.setVisible(true);
    }
}

class Calculator extends JFrame implements ActionListener {
    Container p;
    JSplitPane jsp;
    JTextField resultFiled = new JTextField("0");
    JPanel resultPane = new JPanel();
    JPanel btnPane = new JPanel();
    static float op1=0;
    static int len=0;
    static float op2=0;
    static String output = "";
    static String opp = "";
    static boolean flag1 = true;
    static boolean flag2 = true;
    String[] btnS = {"1", "2", "3", "+",
                                     "4", "5", "6", "-",
                                     "7", "8", "9", "*",
                                     "0", "=", ".", "/"};
    JButton[] btn = new JButton[16];

    public Calculator() {
        p = getContentPane();
        setBounds(100, 100, 300, 300);
        setTitle("计算器");
        setResizable(false);
        setIconImage(new ImageIcon("16.png").getImage());    //设置窗体显示的图标
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));  //设置鼠标形状
        this.setBackground(new Color(255, 0, 255));
        JButton cz = new JButton("reset");
        cz.setBounds(0,0,80,20);
        cz.setBackground(new Color(65, 105, 225));
        cz.setForeground(new Color(255, 0, 0));
        cz.addActionListener(this);
        resultFiled.setEditable(false);
        resultFiled.setHorizontalAlignment(JTextField.RIGHT);  //设置自右向左显示
        resultFiled.setColumns(12);
        resultFiled.setFont(new Font("", Font.PLAIN, 14));
        resultFiled.setBackground(new Color(0, 255, 127));
        resultFiled.setForeground(new Color(255, 0, 0));
        JButton qx = new JButton("cancel");
        qx.addActionListener(this);
        qx.setBackground(new Color(65, 105, 225));
        qx.setForeground(new Color(255, 0, 0));
        qx.setSize(80,20);
        resultPane.setLayout(new FlowLayout());
        resultPane.add(cz);
        resultPane.add(resultFiled);
        resultPane.add(qx);
        btnPane.setLayout(new GridLayout(4, 5, 7, 7));
        for(int i=0; i<16; i++) {
            btn[i] = new JButton(btnS[i]);
            btn[i].setBorderPainted(true);
            btn[i].setContentAreaFilled(true);
            btn[i].setFont(new Font("", Font.BOLD, 25));
            btn[i].setBackground(new Color(255,255,0));
            btn[i].setForeground(new Color(255,0,0));
            btn[i].addActionListener(this);
            btnPane.add(btn[i]);
        }
        jsp = new JSplitPane(JSplitPane.VERTICAL_SPLIT, resultPane, btnPane);
        jsp.setDividerSize(3);
        jsp.setDividerLocation(35);
        p.add(jsp, BorderLayout.CENTER);
    }
    public void actionPerformed(ActionEvent e) {
        if(flag1&&
          (e.getActionCommand()=="1" ||
           e.getActionCommand()=="2" ||
           e.getActionCommand()=="3" ||
           e.getActionCommand()=="4" ||
           e.getActionCommand()=="5" ||
           e.getActionCommand()=="6" ||
           e.getActionCommand()=="7" ||
           e.getActionCommand()=="8" ||
           e.getActionCommand()=="9" ||
           e.getActionCommand()=="0" ||
           e.getActionCommand()==".")) {
            output += e.getActionCommand();
            resultFiled.setText(output);
        }
        if(e.getActionCommand()=="=") {
            if(flag1){
                op2 = Float.parseFloat(resultFiled.getText().substring(len+1));
                output += e.getActionCommand();
                if(opp == "+") {
                    output += (op1+op2)+"";
                } if(opp == "-") {
                    output += (op1+op2)+"";
                } if(opp == "*") {
                    output += (op1*op2)+"";
                } if(opp == "/"){
                    if(op2-0.0 == 0) {
                        output += "error";
                    } else {
                        output += (op1/op2)+"";
                    }
                }
                resultFiled.setText(output);
                flag1 = false;
            }
        }
        if(e.getActionCommand() == "reset") {
            op1 = 0;
            op2 = 0;
            opp = "";
            output ="";
            flag1 = true;
            flag2 = true;
            resultFiled.setText("0");
        }
        if(e.getActionCommand() == "+" ||
           e.getActionCommand() == "-" ||
           e.getActionCommand() == "*" ||
           e.getActionCommand() == "/"){
            if(flag2) {
                op1 = Float.parseFloat(resultFiled.getText());
                len = resultFiled.getText().length();
                opp = e.getActionCommand();
                output += e.getActionCommand();
                resultFiled.setText(output);
                flag2 = false;
            }
        }
    }
}