Question

急急急！！用java语句编写一个计算器程序。在线急等答案！

计算器运算逻辑，
参与运算必须要有两个数——操作数以及一个运算符

1、只输入一个操作数以及一个运算符；另外一个操作数作为0来处理
2、不输入操作数，输入运算符；结果作为0处理
3、有两个操作数及一个运算符；正常运算

操作数及运算符出现的顺序

设有三个变量：OP1/OP2/CAL

当点击运算符后，去判断操作数中是否有值、

Answer 1

给你

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Calculator extends JPanel implements ActionListener {
private JTextField display = new JTextField("0");
private String buttonText = "789/456*123-0.=+";
private double result = 0;
private String operator = "=";
private boolean calculating = true;
public Calculator() {
setLayout(new BorderLayout());
display.setEditable(false);
add(display, "North");
JPanel p = new JPanel();
p.setLayout(new GridLayout(4, 4));
for (int i = 0; i < buttonText.length(); i++) {
JButton b = new JButton(buttonText.substring(i, i + 1));
p.add(b);
b.addActionListener(this);
}
add(p, "Center");
}
public void actionPerformed(ActionEvent evt) {
String cmd = evt.getActionCommand();
if ('0' <= cmd.charAt(0) && cmd.charAt(0) <= '9' || cmd.equals(".")) {
if (calculating)
display.setText(cmd);
else
display.setText(display.getText() + cmd);
calculating = false;
} else {
if (calculating) {
if (cmd.equals("-")) {
display.setText(cmd);
calculating = false;
} else
operator = cmd;
} else {
double x = Double.parseDouble(display.getText());
calculate(x);
operator = cmd;
calculating = true;
}
}
}
private void calculate(double n) {
if (operator.equals("+"))
result += n;
else if (operator.equals("-"))
result -= n;
else if (operator.equals("*"))
result *= n;
else if (operator.equals("/"))
result /= n;
else if (operator.equals("="))
result = n;
display.setText("" + result);
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setTitle("Calculator");
frame.setSize(200, 200);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
Container contentPane = frame.getContentPane();
contentPane.add(new Calculator());
frame.show();
}
}

Answer 2

表示以前做过这种小程序玩 可以去CSDN上找 我上传过源代码和那个小程序

是用exe4j打包的

Answer 3

http://wenku.baidu.com/view/6b6d2ddc360cba1aa811da23.html自己下载吧

Answer 4

想要全部源码？ 那先搜索搜索吧