只用AWT制作计算器，不许使用swing？
我们老师布置了一个小项目——不许使用swing，只能用AWT制作计算器。对于java菜鸟的我，这样做起来还真有点困难，那个+、-、*、/ 事件源我不会……请大家帮忙讨论一下！!
[解决办法]
怎么找不到？四个按钮对象的值属性分别是加减乘除，都加到同一个事件监听里，然后捕获到事件后判断事件源的值属性是什么，最后再来做计算器
[解决办法]
事件都在awt包里
Swing和AWT没有什么区别
不过话说回来，你们老师还是真的牛啊
非要你们用一个已经过时的，被官方抛弃掉的awt去做东西
[解决办法]
[解决办法]
这是我大一时做的，基本上都是用awt做的，楼主觉得哪有不好，自己在修饰一下就好
- Java code
import java.awt.BorderLayout;import java.awt.Color;import java.awt.FlowLayout;import java.awt.GridLayout;import java.awt.Insets;import java.awt.Menu;import java.awt.MenuBar;import java.awt.MenuItem;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.JOptionPane;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.UIManager;import javax.swing.UnsupportedLookAndFeelException;public class Mycalculator extends JFrame{ private String[] names = { "退格", "CE", "C", "/", "7", "8", "9", "*", "4", "5", "6", "-", "1", "2", "3", "+", "0", "+/-", ".", "=" }; private JButton[] jb = new JButton[names.length]; private double x = 0d; private double y = 0d; private int z;// 作为运算符的选择 StringBuffer str; JPanel p; JPanel p1; JTextField jt; MenuItem mi; public Mycalculator() { super("Followme_1987"); MenuBar mb = new MenuBar();// 设置菜单栏 setMenuBar(mb); Menu me = new Menu("编辑"); Menu me1 = new Menu("关于"); Menu me2 = new Menu("帮助"); mi = new MenuItem("请点我"); mi.addActionListener(new Mc()); me1.add(mi); mb.add(me); mb.add(me1); mb.add(me2); jt = new JTextField(19);// 创建文本框 用于显示 jt.setHorizontalAlignment(JTextField.RIGHT); jt.setText("0."); jt.setEditable(false); p = new JPanel(); // 创建一块板儿 并将文本框加入 p.setBounds(8, 2, 220, 30); p.setLayout(new FlowLayout(FlowLayout.LEFT)); p.add(jt); p1 = new JPanel(); // 创建另一块儿板儿 p1.setLayout(new GridLayout(5, 4, 5, 5)); p1.setBounds(13, 35, 210, 140); jt.setBackground(Color.getHSBColor(23, 25, 125)); for (int i = 0; i < jb.length; i++) { // 加入按钮 jb[i] = new JButton(names[i]); jb[i].setMargin(new Insets(4, 1, 4, 1)); p1.add(jb[i]); if (i == 1 || i == 2 || i == 0) { jb[i].setForeground(Color.BLUE); } else if (i == 3 || i == 7 || i == 11 || i == 15) { jb[i].setForeground(Color.RED); } else if (i == 19) { jb[i].setForeground(Color.YELLOW); jb[i].setBackground(Color.RED); } else { jb[i].setBackground(Color.DARK_GRAY); jb[i].setForeground(Color.YELLOW); } jb[i].addActionListener(new Mc()); }// 以上颜色带给人 轻松的感觉 避免视觉疲劳 setLayout(null); add(p1); add(p); str = new StringBuffer(); } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Mycalculator frame = new Mycalculator(); frame.setBounds(400, 200, 240, 230); // frame.setLocationRelativeTo(null); frame.setDefaultCloseOperation(EXIT_ON_CLOSE); frame.setVisible(true); frame.setResizable(false); } public class Mc implements ActionListener { public void actionPerformed(ActionEvent e) { if (e.getSource() == mi) { JOptionPane.showMessageDialog(null, "楼主要记得结贴......"); } if (e.getSource() == jb[0]) { // 按下退格键 if (!jt.getText().trim().equals("0.")) { if (str.length() != 1) { jt.setText(str.delete(str.length() - 1, str.length()) .toString()); } else { jt.setText("0."); str.setLength(0); } y = Double.parseDouble(jt.getText().trim()); } } else if (e.getSource() == jb[1] || e.getSource() == jb[2]) { // 按下CE键或者C键 jt.setText("0."); str.setLength(0); x = 0d; y = 0d; z = 0; } else if (e.getSource() == jb[3]) { // 按下除号键 并且设置z=1 x = Double.parseDouble(jt.getText().trim()); str.setLength(0); y = 0d; z = 1; } else if (e.getSource() == jb[7]) { // 按下乘号键并且设置z=2 x = Double.parseDouble(jt.getText().trim()); str.setLength(0); y = 0d; z = 2; } else if (e.getSource() == jb[11]) { // 按下减号键并且设置z=3 x = Double.parseDouble(jt.getText().trim()); str.setLength(0); y = 0d; z = 3; } else if (e.getSource() == jb[15]) { // 按下加号键并且设置z=4 x = Double.parseDouble(jt.getText().trim()); str.setLength(0); y = 0d; z = 4; } else if (e.getSource() == jb[19]) { // 按下=号键 str.setLength(0); switch (z) { case 1: jt.setText("" + (x / y)); break; case 2: jt.setText("" + (x * y)); break; case 3: jt.setText("" + (x - y)); break; case 4: jt.setText("" + (x + y)); break; } } else if (e.getSource() == jb[17]) { // 按下+/- if (jt.getText().trim().equals("0.")) { } else { // x = Double.parseDouble(jt.getText().trim()); // jt.setText("" + (-x)); if (jt.getText().trim().startsWith("-")) { jt.setText(jt.getText().trim().substring(1)); } else { jt.setText("-" + jt.getText().trim()); } } } else if (e.getSource() == jb[18]) { // 按下小数点 if (jt.getText().trim().indexOf(".") != -1) {// 字符串中有小数点 if (jt.getText().trim().equals("0.")) { // 为初始状态 str.setLength(0); jt.setText(str.append("0.").toString()); } else { } } else { jt.setText(str.append(e.getActionCommand()).toString()); } y = 0d; } else if (e.getSource() == jb[16]) {// 按下0键 if (!jt.getText().trim().equals("0.")) { jt.setText(str.append(e.getActionCommand()).toString()); y = Double.parseDouble(e.getActionCommand().trim()); } else { } } else {// 按下其他数字键 jt.setText(str.append(e.getActionCommand()).toString()); y = Double.parseDouble(jt.getText().trim()); } } }}
[解决办法]
发个CoreJava里面用Swing写的给你参考一下。个人感觉很经典
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
* @version 1.33 2007-06-12
* @author Cay Horstmann
*/
public class Calculator
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
CalculatorFrame frame = new CalculatorFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
/**
* A frame with a calculator panel.
*/
class CalculatorFrame extends JFrame
{
public CalculatorFrame()
{
setTitle("Calculator");
CalculatorPanel panel = new CalculatorPanel();
add(panel);
pack();
}
}
/**
* A panel with calculator buttons and a result display.
*/
class CalculatorPanel extends JPanel
{
public CalculatorPanel()
{
setLayout(new BorderLayout());
result = 0;
lastCommand = "=";
start = true;
// add the display
display = new JButton("0");
display.setEnabled(false);
add(display, BorderLayout.NORTH);
ActionListener insert = new InsertAction();
ActionListener command = new CommandAction();
// add the buttons in a 4 x 4 grid
panel = new JPanel();
panel.setLayout(new GridLayout(4, 4));
addButton("7", insert);
addButton("8", insert);
addButton("9", insert);
addButton("/", command);
addButton("4", insert);
addButton("5", insert);
addButton("6", insert);
addButton("*", command);
addButton("1", insert);
addButton("2", insert);
addButton("3", insert);
addButton("-", command);
addButton("0", insert);
addButton(".", insert);
addButton("=", command);
addButton("+", command);
add(panel, BorderLayout.CENTER);
}
/**
* Adds a button to the center panel.
* @param label the button label
* @param listener the button listener
*/
private void addButton(String label, ActionListener listener)
{
JButton button = new JButton(label);
button.addActionListener(listener);
panel.add(button);
}
/**
* This action inserts the button action string to the end of the display text.
*/
private class InsertAction implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
String input = event.getActionCommand();
if (start)
{
display.setText("");
start = false;
}
display.setText(display.getText() + input);
}
}
/**
* This action executes the command that the button action string denotes.
*/
private class CommandAction implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
String command = event.getActionCommand();
System.out.println(command);
if (start)
{
if (command.equals("-"))
{
System.out.println(command);
display.setText(command);
start = false;
}
else lastCommand = command;
}
else
{
calculate(Double.parseDouble(display.getText()));
lastCommand = command;
start = true;
}
}
}
/**
* Carries out the pending calculation.
* @param x the value to be accumulated with the prior result.
*/
public void calculate(double x)
{
if (lastCommand.equals("+")) result += x;
else if (lastCommand.equals("-")) result -= x;
else if (lastCommand.equals("*")) result *= x;
else if (lastCommand.equals("/")) result /= x;
else if (lastCommand.equals("=")) result = x;
display.setText("" + result);
}
private JButton display;
private JPanel panel;
private double result;
private String lastCommand;
private boolean start;
}
[解决办法]
学习了
[解决办法]
- Java code
//发个纯正awt的
import java.lang.Math.*;
import java.awt.Button;
import java.awt.Font;
import java.awt.Frame;
import java.awt.GridLayout;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
public class jisuqi extends Frame implements ActionListener, WindowListener, ItemListener {
int i;
double c;
String s[] = {"Backspace", "CE", "C", "7", "8", "9", "/", "sqrt", "4", "5", "6", "*", "%", "1", "2", "3", "-", "1/x", "0", " +/-", ".", "+", "="};
Button but[] = new Button[s.length];
TextField t1 = new TextField("0");
jisuqi() {
super("计算器");
setSize(250, 250);
Font f;
f = new Font("黑体", Font.BOLD, 45);
for (int i = 0; i < s.length; i++) {
but[i] = new Button(s[i]);
but[i].addActionListener(this);
}
setLayout(new GridLayout(4, 1));
Panel p1 = new Panel();
p1.setLayout(new GridLayout(1, 1, 1, 1));
p1.add(t1);
add(p1);
Panel p2 = new Panel();
p2.setLayout(new GridLayout(1, 3));
for (int i = 0; i < 3; i++) {
p2.add(but[i]);
}
add(p2);
Panel p3 = new Panel();
p3.setLayout(new GridLayout(2, 5));
for (int i = 3; i < 13; i++) {
p3.add(but[i]);
}
add(p3);
Panel p4 = new Panel();
p4.setLayout(new GridLayout(2, 5));
for (int i = 13; i < 23; i++) {
p4.add(but[i]);
}
add(p4);
addWindowListener(this);
setVisible(true);
}
public void actionPerformed(ActionEvent a) {
String s = a.getActionCommand();
String b;
if (s.equals("Backspace")) {
b = t1.getText().substring(0, t1.getText().length() - 1);
if (b.length() == 0) {
t1.setText("0");
}
if (t1.getText().equals("0") || t1.getText().equals("")) {
t1.setText("0");
} else {
t1.setText(b);
}
}
if (s.equals("C") || s.equals("CE")) {
t1.setText("0");
}
if (s.equals("0")) {
if (t1.getText().equals("0")) {
t1.setText("0");
} else {
t1.setText(t1.getText() + "0");
}
}
if (s.equals("1")) {
if (t1.getText().equals("0")) {
t1.setText("1");
} else {
t1.setText(t1.getText() + "1");
}
}
if (s.equals("2")) {
if (t1.getText().equals("0")) {
t1.setText("2");
} else {
t1.setText(t1.getText() + "2");
}
}
if (s.equals("3")) {
if (t1.getText().equals("0")) {
t1.setText("3");
} else {
t1.setText(t1.getText() + "3");
}
}
if (s.equals("4")) {
if (t1.getText().equals("0")) {
t1.setText("4");
} else {
t1.setText(t1.getText() + "4");
}
}
if (s.equals("5")) {
if (t1.getText().equals("0")) {
t1.setText("5");
} else {
t1.setText(t1.getText() + "5");
}
}
if (s.equals("6")) {
if (t1.getText().equals("0")) {
t1.setText("6");
} else {
t1.setText(t1.getText() + "6");
}
}
if (s.equals("7")) {
if (t1.getText().equals("0")) {
t1.setText("7");
} else {
t1.setText(t1.getText() + "7");
}
}
if (s.equals("8")) {
if (t1.getText().equals("0")) {
t1.setText("8");
} else {
t1.setText(t1.getText() + "8");
}
}
if (s.equals("9")) {
if (t1.getText().equals("0")) {
t1.setText("9");
} else {
t1.setText(t1.getText() + "9");
}
}
if (s.equals("+")) {
b = t1.getText();
c = Double.parseDouble(b);
t1.setText("");
i = 0;
}
if (s.equals("-")) {
b = t1.getText();
c = Double.parseDouble(b);
t1.setText("");
i = 1;
}
if (s.equals("*")) {
b = t1.getText();
c = Double.parseDouble(b);
t1.setText("");
i = 2;
}
if (s.equals("/")) {
b = t1.getText();
c = Double.parseDouble(b);
t1.setText("");
i = 3;
}
if (s.equals(".")) {
if (!t1.getText().substring(t1.getText().length() - 1, t1.getText().length()).equals(".")) {
t1.setText(t1.getText() + ".");
}
}
if (s.equals("sqrt")) {
b = t1.getText();
double d = Double.parseDouble(b);
double e = Math.sqrt(d);
t1.setText(Double.toString(e));
}
if (s.equals("%")) {
b = t1.getText();
double d = Double.parseDouble(b);
t1.setText(Double.toString(d / 100));
}
if (s.equals("1/x")) {
b = t1.getText();
double d = Double.parseDouble(b);
double e = 1 / d;
t1.setText(Double.toString(e));
}
if (s.equals("+/-")) {
if (t1.getText().substring(0, 1).equals("-")) {
t1.setText(t1.getText().substring(1, t1.getText().length()));
} else {
t1.setText("-" + t1.getText());
}
}
if (s.equals("=")) {
b = t1.getText();
double c1 = Double.parseDouble(b);
if (i == 0) {
t1.setText(Double.toString(c + c1));
}
if (i == 1) {
t1.setText(Double.toString(c - c1));
}
if (i == 2) {
t1.setText(Double.toString(c * c1));
}
if (i == 3) {
t1.setText(Double.toString(c / c1));
}
}
}
public void windowActivated(WindowEvent arg0) {
}
public void windowClosed(WindowEvent arg0) {
}
public void windowClosing(WindowEvent arg0) {
Window f = (Window) arg0.getSource();
f.dispose();
}
public void windowDeactivated(WindowEvent arg0) {
}
public void windowDeiconified(WindowEvent arg0) {
}
public void windowIconified(WindowEvent arg0) {
}
public void windowOpened(WindowEvent arg0) {
}
public void itemStateChanged(ItemEvent arg0) {
}
public static void main(String[] args) {
jisuqi s = new jisuqi();
}
}
[解决办法]
- Java code
/*
这是我两年前写的，此计算机的功能不甚强大。
它可以实现加、减、乘、除，当然，可以输入[color=#FF0000][b]一串算式[/b][/color]，[b][color=#FF0000]可以加括号[/color][/b]，运算时是会判
断优先级的。不过，输入算式时，一定要输入标准的，否则会没有反应。
标准的如：12*(34/(45-32))+98
不标准的：12(34+98) (这里，乘号不能少)
+12 (这也不行，呵呵)
功能键：
AC：清屏（遇到问题时，按这个键即可）
C：退格键（即删除一个字符）
RE: 重新显示（在按下“＝”以后，算式没了，显示的是结果，如果你还想看算式，
可以按下此键
最后说明一下：如果你运行它的时候，发现只看到一个界面，没有按钮等情况，请不
要怀疑我的程序，可能是系统的问题。当然，遇到这种情况，你关闭窗口。再次运行
，就不会有这种问题了。如果还有什么问题的话，可以用QQ留言给我：815611030
*/
import java.awt.*;
import java.awt.event.*;
import java.util.*;
class Stack
{
String s[]=new String[100];
int n=0;
public void InQuece(String str)
{
s[n]=str;
n++;
}
public String DeQuece()
{
return s[--n];
}
public String Front()
{
return s[n-1];
}
public void Sprint()
{
for(int i=n-1;i>=0;i--)
System.out.print(s[i]+" ");
System.out.println();
}
}
public class Calculator
{
static Frame frm=new Frame("Calculator");
//static TextField tff=new TextField(20);
static Label lab=new Label("0.");
static Panel pan=new Panel();
static String labelstr="";
static String ltemp="";
static int flag=1;
static Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19;
public void setFrame()
{
frm.setBounds(300,150,400,350);
frm.setLayout(null);
frm.addWindowListener(new window());
frm.setVisible(true);
b0=new Button("0");b1=new Button("1");b2=new Button("2");b3=new Button("3");b4=new Button("4");b5=new Button("5");b6=new Button("6");
b7=new Button("7");b8=new Button("8");b9=new Button("9");
b10=new Button("+");b11=new Button("-");b12=new Button("*");b13=new Button("/");b14=new Button("AC");b15=new Button("C");b16=new Button("=");
b17=new Button("(");b18=new Button(")");b19=new Button("RE");
lab.setBounds(0, 30, 400, 40);
lab.setFont(new Font("宋体",Font.PLAIN,30));
lab.setAlignment(Label.RIGHT);
pan.setBounds(0,60, 400, 300);
pan.setLayout(new GridLayout(5,4));
b0.addActionListener(new action());b1.addActionListener(new action());b2.addActionListener(new action());b3.addActionListener(new action());b4.addActionListener(new action());
b5.addActionListener(new action());b6.addActionListener(new action());b7.addActionListener(new action());b8.addActionListener(new action());b9.addActionListener(new action());
b10.addActionListener(new action());b11.addActionListener(new action());b12.addActionListener(new action());b13.addActionListener(new action());b14.addActionListener(new action());
b15.addActionListener(new action());b16.addActionListener(new action());b17.addActionListener(new action());b18.addActionListener(new action());b19.addActionListener(new action());
pan.add(b1);pan.add(b2);pan.add(b3);pan.add(b10);pan.add(b4);pan.add(b5);pan.add(b6);pan.add(b11);pan.add(b7);pan.add(b8);pan.add(b9);pan.add(b12);
pan.add(b0);pan.add(b14);pan.add(b15);pan.add(b13);pan.add(b16);pan.add(b17);pan.add(b18);pan.add(b19);
frm.add(lab);
frm.add(pan);
frm.setVisible(true);
}
[解决办法]
- Java code
public double cal(String str) { str=str.trim(); StringTokenizer st=new StringTokenizer(str,"+-*/ ",true); Stack sta=new Stack(); String s,s1,s2; while(st.hasMoreTokens()) { s=st.dar.getTi