Delete 'com.java'

5 months ago · e3dba94a85
parent 7993c0a869
commit e3dba94a85
1 changed files with 0 additions and 118 deletions
--- a/com.java
+++ b/com.java
@ -1,118 +0,0 @@
 package computer;
 import javax.swing.*;
 import java.awt.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.text.MessageFormat;
 import java.util.Arrays;
 public class com {
    public static void main(String[] args) {
        new JS();
    }
 }
 class JS extends JFrame implements ActionListener {
    private final StringBuilder sBuilder = new StringBuilder();
    JTextArea text = new JTextArea();
    double a, b;
    Double sum;
    String lastOperator = "=";
    public JS() {
        setBounds(100, 100, 400, 400);
        setTitle("计算器");
        JMenuBar menubar = new JMenuBar();
        this.setJMenuBar(menubar);
        this.setLayout(new BorderLayout());
        JPanel p1 = new JPanel();
        JPanel p2 = new JPanel();
        text.setPreferredSize(new Dimension(370, 60));
        p2.setLayout(new FlowLayout());
        p1.add(text);
        this.add(p1, BorderLayout.NORTH);
        p2.setLayout(new GridLayout(5, 4));
        JButton[] button = new JButton[20];
        button[0] = new JButton("C");
        button[1] = new JButton("CE");
        button[2] = new JButton("%");
        button[3] = new JButton("÷");
        button[4] = new JButton("7");
        button[5] = new JButton("8");
        button[6] = new JButton("9");
        button[7] = new JButton("*");
        button[8] = new JButton("4");
        button[9] = new JButton("5");
        button[10] = new JButton("6");
        button[11] = new JButton("-");
        button[12] = new JButton("1");
        button[13] = new JButton("2");
        button[14] = new JButton("3");
        button[15] = new JButton("+");
        button[16] = new JButton(" ");
        button[17] = new JButton("0");
        button[18] = new JButton(".");
        button[19] = new JButton("=");
        Arrays.stream(button).forEach(p2::add);
        this.add(p2, BorderLayout.CENTER);
        for (JButton jButton : button) {
            jButton.addActionListener(this);
        }
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    public void actionPerformed(ActionEvent e) {
        String lab = e.getActionCommand();
        if (Character.isDigit(lab.charAt(0)) || lab.equals(".")) {
            sBuilder.append(lab);
            text.setText(sBuilder.toString());
        } else if (lab.equals("CE")) {
            sBuilder.deleteCharAt(sBuilder.length() - 1);
            text.setText(sBuilder.toString());
        } else if (lab.equals("C")) {
            sBuilder.setLength(0);
            text.setText("");
        } else if (lab.equals("+") || lab.equals("-") || lab.equals("*") || lab.equals("÷") || lab.equals("%")) {
            if (sBuilder.length() > 0) {
                a = Double.parseDouble(sBuilder.toString());
                sBuilder.setLength(0);
                lastOperator = lab;
                text.setText(MessageFormat.format("{0} {1} ", a, lastOperator));
            }
        } else if (lab.equals("=")) {
            if (lastOperator != null && !lastOperator.isEmpty() && sBuilder.length() > 0) {
                b = Double.parseDouble(sBuilder.toString());
                calculate();
            }
        }
    }
    private void calculate() {
        switch (lastOperator) {
            case "+":
                sum = a + b;
                break;
            case "-":
                sum = a - b;
                break;
            case "*":
                sum = a * b;
                break;
            case "÷":
                if (b == 0) {
                    text.setText("除数不能为0");
                    return;
                }
                sum = a / b;
                break;
            case "%":
                if (b == 0) {
                    text.setText("除数不能为0");
                    return;
                }
                sum = a % b;
                break;
        }
        text.setText(sum + "");
        sBuilder.setLength(0);
        sBuilder.append(sum);
        lastOperator = "=";
    }
 }