废话不多说 , 直接贴代码 , 有详细的注释 , 中间不懂的可以在底下留言评论 , 我也是刚学GUI没多久......
这个是效果图 :
package gui;
import java.awt.*; // 这个是java的gui编程里面一个很重要的包
import java.awt.event.*; // 用来处理事件所需要
import java.util.Stack; // 栈 , 我用来处理运算的
public class Calculator extends Frame implements ActionListener{
private static final long serialVersionUID = 1L;
int frame_width = 1000,frame_height = 400;
Panel panel_textfield,panel_number,panel_op,panel_other;
Button [] number_buttons;
Button [] op_buttons;
TextField textfield;
public Calculator() {
super("计算器");
init();
setLayout();
setBackground();
setBounds();
setFonts();
addButtons();
textfield.setEditable(false);
addWindowListener
(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
}
);
setVisible(true);
}
public void init() {
panel_textfield = new Panel();
panel_number = new Panel();
panel_op = new Panel();
panel_other = new Panel();
textfield = new TextField(frame_width);
setResizable(false);
add(panel_textfield);
add(panel_other);
panel_textfield.add(textfield);
panel_other.add(panel_number);
panel_other.add(panel_op);
}
public void setLayout() {
setLayout(new GridLayout(2,1,4,4));
panel_textfield.setLayout(null);
panel_other.setLayout(new GridLayout(1,2,4,4));
panel_number.setLayout(new GridLayout(5,3,4,4));
panel_op.setLayout(new GridLayout(3,1,4,4));
}
public void setBackground() {
panel_textfield.setBackground(Color.red);
panel_number.setBackground(Color.green);
panel_op.setBackground(Color.blue);
}
public void setBounds() {
setBounds(0, 0, frame_width, frame_height);
textfield.setBounds(0, 0, frame_width, frame_height / 2);
}
public void addButtons() {
String [] titles1 = {"/", "*", "-",
"7", "8", "9",
"4", "5", "6",
"1", "2", "3",
"0", ".", "c"};
String [] titles2 = {"x", "+", "="};
number_buttons = new Button[15];
op_buttons = new Button[3];
for(int i = 0; i < this.number_buttons.length; i++) {
number_buttons[i] = new Button(titles1[i]);
panel_number.add(number_buttons[i]);
number_buttons[i].addActionListener(this);
}
for(int i = 0; i < this.op_buttons.length; i++) {
op_buttons[i] = new Button(titles2[i]);
panel_op.add(this.op_buttons[i]);
op_buttons[i].addActionListener(this);
}
}
@Override
public void actionPerformed(ActionEvent e) {
Button button = (Button) e.getSource();
for(int i = 0; i < 14; i++) {
if(button == number_buttons[i] || button == op_buttons[1]) {
textfield.setText(textfield.getText() + button.getLabel());
return;
}
}
if(button == number_buttons[14]) {
textfield.setText("");
return;
}
if(button == op_buttons[0]) {
String s = textfield.getText();
if(s.length() > 0)
textfield.setText(s.substring(0, s.length() - 1));
return;
}
if(button == op_buttons[2]) {
textfield.setText(getResult());
return;
}
}
public String getResult() {
String s = textfield.getText();
String num = "";
Stacknums = new Stack();
Stackops = new Stack();
for(int i = 0; i < s.length(); i++) {
String temp = s.charAt(i) + "";
if(temp.matches("[0-9]") || temp.matches("[.]")) {
num += temp;
}
else if(temp.matches("[*+]") || temp.matches("[-]") | temp.matches("[/]")) {
if(!num.equals(""))
nums.push(Double.parseDouble(num));
if(ops.isEmpty() || cmpLevel(temp,ops.peek())) {
ops.push(temp);
}
else {
Double num1 = nums.pop();
Double num2 = nums.pop();
String op2 = ops.pop();
nums.push(compute(num2,num1,op2));
i--;
}
num = "";
}
}
while(!ops.isEmpty()) {
if(!num.equals("")) {
nums.push(compute(nums.pop(),Double.parseDouble(num),ops.pop()));
num = "";
}
else {
Double num1 = nums.pop();
Double num2 = nums.pop();
nums.push(compute(num2,num1,ops.pop()));
}
}
return nums.pop().toString();
}
public Double compute(double num1,double num2,String op) {
if(op.equals("+")) {
return num1 + num2;
}
else if(op.equals("-")) {
return num1 - num2;
}
else if(op.equals("*")) {
return num1 * num2;
}
else
return num1 / num2;
}
public boolean cmpLevel(String s1,String s2) {
if(s1.equals("+") || s1.equals("-")) {
return false;
}
else {
if(s2.equals("+") || s2.equals("-"))
return true;
return false;
}
}
public void setFonts() {
panel_number.setFont(new Font("微软雅黑",Font.PLAIN,24));
panel_op.setFont(new Font("微软雅黑",Font.PLAIN,24));
panel_other.setFont(new Font("微软雅黑",Font.PLAIN,24));
textfield.setFont(new Font("微软雅黑",Font.PLAIN,48));
}
public static void main(String [] args) {
new Calculator();
}
}