Question

用JAVA做一个简单的计算器

高手帮忙啊~
帮我做一个计算器
只要有简单的四则运算就可以
不过要考虑运算顺序
程序一定要能运行出来
不要那些复杂的代码 我只需要能四则运算就可以了~
希望可以有简单的注释~

我可以再加分~~!

Answer 1

1.窗体
package Calc;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

/**
*
* 计算器程序
*
*/
public class CalcFrame extends JFrame {
JButton[] buttons = new JButton[16];// 16个按钮

StringBuffer sb = null;//

JTextField text1 = null;// 计算器结果显示框

String no1 = null;

String sign = null;// 表示+-*/符号

String[] s = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "+", "-",
"*", "/", "=", "C" };// 面板上的字符

public CalcFrame() {
setTitle("计算器");
setResizable(false);
setBounds(200, 200, 300, 350);
setLayout(null);

sb = new StringBuffer();
text1 = new JTextField();
text1.setBounds(10, 10, 250, 30);// 设置位置
text1.setFont(new Font("Arial", Font.PLAIN, 20));// 设置字体
text1.setForeground(Color.RED);// 设置颜色
add(text1);
for (int i = 0; i < s.length; i++) {

buttons[i] = new JButton(s[i]);
buttons[i].setFont(new Font("Serif", Font.BOLD, 18));
add(buttons[i]);
}// 生成面板上的按钮.

buttons[0].setBounds(10, 50, 50, 40);
buttons[0].addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
sb.append(0);
text1.setText(sb.toString());
}

});
buttons[1].setBounds(70, 50, 50, 40);
buttons[1].addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
sb.append(1);
text1.setText(sb.toString());
}

});
buttons[2].setBounds(130, 50, 50, 40);
buttons[2].addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
sb.append(2);
text1.setText(sb.toString());
}

});
buttons[3].setBounds(190, 50, 50, 40);
buttons[3].addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
sb.append(3);
text1.setText(sb.toString());
}

});
buttons[4].setBounds(10, 100, 50, 40);
buttons[4].addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
sb.append(4);
text1.setText(sb.toString());
}

});
buttons[5].setBounds(70, 100, 50, 40);
buttons[5].addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
sb.append(5);
text1.setText(sb.toString());
}

});
buttons[6].setBounds(130, 100, 50, 40);
buttons[6].addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
sb.append(6);
text1.setText(sb.toString());
}

});
buttons[7].setBounds(190, 100, 50, 40);
buttons[7].addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
sb.append(7);
text1.setText(sb.toString());
}

});
buttons[8].setBounds(10, 150, 50, 40);
buttons[8].addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
sb.append(8);
text1.setText(sb.toString());
}

});
buttons[9].setBounds(70, 150, 50, 40);
buttons[9].addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
sb.append(9);
text1.setText(sb.toString());
}

});
buttons[10].setBounds(130, 150, 50, 40);
buttons[10].addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
sign = "+";
no1 = text1.getText();
sb.delete(0, sb.capacity());

}
});
buttons[11].setBounds(190, 150, 50, 40);
buttons[11].addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
sign = "-";
no1 = text1.getText();
sb.delete(0, sb.capacity());

}
});
buttons[12].setBounds(10, 200, 50, 40);
buttons[12].addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
sign = "*";
no1 = text1.getText();
sb.delete(0, sb.capacity());

}
});
buttons[13].setBounds(70, 200, 50, 40);
buttons[13].addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
sign = "/";
no1 = text1.getText();
sb.delete(0, sb.capacity());

}
});
buttons[14].setForeground(Color.RED);
buttons[14].setBounds(130, 200, 50, 40);
buttons[14].addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
int sum = 0;//最终结果
if (sign.equals("+")) {
int no2 = Integer.parseInt(no1);//取得前一个数

int no3 = Integer.parseInt(text1.getText());//取得现在的数

sum = no2 + no3;//累加

text1.setText(String.valueOf(sum));

}
if (sign.equals("-")) {
int no2 = Integer.parseInt(no1);

int no3 = Integer.parseInt(text1.getText());

sum = no2 - no3;

text1.setText(String.valueOf(sum));

}
if (sign.equals("*")) {
int no2 = Integer.parseInt(no1);

int no3 = Integer.parseInt(text1.getText());

sum = no2 * no3;

text1.setText(String.valueOf(sum));

}

if (sign.equals("/")) {
int no2 = Integer.parseInt(no1);

int no3 = Integer.parseInt(text1.getText());

sum = no2 / no3;

text1.setText(String.valueOf(sum));

}

}

});
buttons[15].setBounds(190, 200, 50, 40);
buttons[15].addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {
sb.delete(0, sb.capacity());//清除sb的内容
text1.setText("");//结果框设置为空
}
});

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//响应关闭窗口
setVisible(true);//显示窗口
}
}

2.主程序类
package Calc;

public class CalcTest {

public static void main(String[] args) {
CalcFrame f = new CalcFrame();

}

}

Answer 2

学习中,这个题很适合自己去读啊,谢谢..