//将字符串类型转换为浮点型
private static float parseNumber(String number)
{
float real_number;
try {
real_number = Float.parseFloat(number);
} catch (NumberFormatException e) {
real_number = Float.NaN;
}
return real_number;
}
}
//
CalculatorGUI.java
import
java.awt.*;
import
java.awt.event.*;
public class
CalculatorGUI {
//
定义按钮
private Button key0, key1, key2, key3,
key4;
private Button key5, key6, key7, key8,
key9;
private Button keyequal, keyplus,
keyminus;
private Button keyperiod, keymult, keydiv;
//
定义存放按钮的区域
private Panel buttonArea;
//
定义存放运算结果的区域
private Label answer;
//
用来实现运算功能的类的对象实例化
private Calculator calculator;
private boolean
readyForNextNumber;
public CalculatorGUI() {
calculator = new Calculator();
readyForNextNumber = true;
answer = new Label("0.0",Label.RIGHT);
key0 = new Button("0");
key1 = new Button("1");
key2 = new Button("2");
key3 = new Button("3");
key4 = new Button("4");
key5 = new Button("5");
key6 = new Button("6");
key7 = new Button("7");
key8 = new Button("8");
key9 = new Button("9");
keyequal = new Button("=");
keyplus = new Button("+");
keyminus = new Button("-");
keymult = new Button("*");
keydiv = new Button("/");
keyperiod = new Button(".");
buttonArea = new Panel();
}
public void launchFrame() {
buttonArea.setLayout(new GridLayout(4,4));
buttonArea.add(key7);
buttonArea.add(key8);
buttonArea.add(key9);
buttonArea.add(keyplus);
buttonArea.add(key4);
buttonArea.add(key5);
buttonArea.add(key6);
buttonArea.add(keyminus);
buttonArea.add(key1);
buttonArea.add(key2);
buttonArea.add(key3);
buttonArea.add(keymult);
buttonArea.add(key0);
buttonArea.add(keyperiod);
buttonArea.add(keyequal);
buttonArea.add(keydiv);
//
设置事件接收句柄
OpButtonHanlder op_handler = new
OpButtonHanlder();
NumberButtonHanlder number_handler = new
NumberButtonHanlder();
key0.addActionListener(number_handler);
key1.addActionListener(number_handler);
key2.addActionListener(number_handler);
key3.addActionListener(number_handler);
key4.addActionListener(number_handler);
key5.addActionListener(number_handler);
key6.addActionListener(number_handler);
key7.addActionListener(number_handler);
key8.addActionListener(number_handler);
key9.addActionListener(number_handler);
keyperiod.addActionListener(number_handler);
keyplus.addActionListener(op_handler);
keyminus.addActionListener(op_handler);
keymult.addActionListener(op_handler);
keydiv.addActionListener(op_handler);
keyequal.addActionListener(op_handler);
//July/整理/05.23/。
