java简单计算器Gui
2016-05-08 23:33
465 查看
package 计算器;
import java.awt.Window;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class CalculatePanel extends JPanel{
boolean start;
String lastCommand="=";
double result;
JFrame frame=new JFrame();
JButton display;
private JPanel panel;
public CalculatePanel(){
frame.setSize(800, 600);
panel=new JPanel();
display=new JButton("0");
start=true;
display.setEnabled(false);
setLayout(new BorderLayout());
panel.setLayout(new GridLayout(4,4));
ActionListener listener=new NumAction();
ActionListener watch=new CalculateAction();
frame.add(display,BorderLayout.NORTH);
addButton("7",listener);
addButton("8",listener);
addButton("9",listener);
addButton("/",watch);
addButton("4",listener);
addButton("5",listener);
addButton("6",listener);
addButton("*",watch);
addButton("1",listener);
addButton("2",listener);
addButton("3",listener);
addButton("-",watch);
addButton("0",listener);
addButton(".",listener);
addButton("=",watch);
addButton("+",watch);
add(panel,BorderLayout.CENTER);
frame.add(panel,BorderLayout.CENTER);
frame.setTitle("计算器");
frame.setVisible(true);
}
private void addButton(String str,ActionListener listener){
JButton button=new JButton(str);
button.addActionListener(listener);// 给按钮添加监听器
panel.add(button);//讲按钮添加到面板中
}
class NumAction implements ActionListener{
public void actionPerformed(ActionEvent event) {
// TODO 自动生成的方法存根
String input=event.getActionCommand();
if(start){
display.setText("");
start=false;
}
display.setText(display.getText()+input);
}
}
class CalculateAction implements ActionListener{
public void actionPerformed(ActionEvent event){//实现每个ActionListener接口的类必须要实现actionPerformed()方法
String command=event.getActionCommand();
if(start){
if(command.equals("-")) {
display.setText(command);
start=false;
}
else lastCommand=command;
}
else {
Calculate(Double.parseDouble(display.getText()));
lastCommand=command;
start=true;
}
}
}
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 result=x;
display.setText(""+result);;
}
}
public class Test {
public static void main(String[] args) {
// TODO 自动生成的方法存根
CalculatePanel a=new CalculatePanel();
}
}
import java.awt.Window;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class CalculatePanel extends JPanel{
boolean start;
String lastCommand="=";
double result;
JFrame frame=new JFrame();
JButton display;
private JPanel panel;
public CalculatePanel(){
frame.setSize(800, 600);
panel=new JPanel();
display=new JButton("0");
start=true;
display.setEnabled(false);
setLayout(new BorderLayout());
panel.setLayout(new GridLayout(4,4));
ActionListener listener=new NumAction();
ActionListener watch=new CalculateAction();
frame.add(display,BorderLayout.NORTH);
addButton("7",listener);
addButton("8",listener);
addButton("9",listener);
addButton("/",watch);
addButton("4",listener);
addButton("5",listener);
addButton("6",listener);
addButton("*",watch);
addButton("1",listener);
addButton("2",listener);
addButton("3",listener);
addButton("-",watch);
addButton("0",listener);
addButton(".",listener);
addButton("=",watch);
addButton("+",watch);
add(panel,BorderLayout.CENTER);
frame.add(panel,BorderLayout.CENTER);
frame.setTitle("计算器");
frame.setVisible(true);
}
private void addButton(String str,ActionListener listener){
JButton button=new JButton(str);
button.addActionListener(listener);// 给按钮添加监听器
panel.add(button);//讲按钮添加到面板中
}
class NumAction implements ActionListener{
public void actionPerformed(ActionEvent event) {
// TODO 自动生成的方法存根
String input=event.getActionCommand();
if(start){
display.setText("");
start=false;
}
display.setText(display.getText()+input);
}
}
class CalculateAction implements ActionListener{
public void actionPerformed(ActionEvent event){//实现每个ActionListener接口的类必须要实现actionPerformed()方法
String command=event.getActionCommand();
if(start){
if(command.equals("-")) {
display.setText(command);
start=false;
}
else lastCommand=command;
}
else {
Calculate(Double.parseDouble(display.getText()));
lastCommand=command;
start=true;
}
}
}
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 result=x;
display.setText(""+result);;
}
}
public class Test {
public static void main(String[] args) {
// TODO 自动生成的方法存根
CalculatePanel a=new CalculatePanel();
}
}
相关文章推荐
- HDU 4918 Query on the subtree
- VOLTE parameter in Attach Request/Accept message
- Jmeter之csv、用户自定义变量以及Query Type分析(八)
- GUI
- iOS 中的UIWindow
- buildroot(一)
- paper:synthesizable finit state machine design techniques using the new systemverilog 3.0 enhancements之fsm1各种style的timing/area比较
- Java StringBuilder 和 StringBuffer 源码分析
- UESTC - 1045 Lovely princess (模拟)水
- UESTC - 1041 Hug the princess(位运算&转换)好题
- UESTC - 1039 Fabricate equation (DFS&模拟)
- UESTC - 1034 AC Milan VS Juventus (模拟&博弈)
- Byte Array to NSData——iOS将服务器返回的图片字节数组用UIImageView显示该图像
- 347. Top K Frequent Elements
- vue源码解读预热-0
- UVa 10789 - Prime Frequency -- 模拟
- GUI
- GUI.菜单栏
- UI基础_UISearchBar
- uestc1041Hug the princess