import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class MyCalculator extends JFrame
{
double startNumber=0.0;
JTextField jf=new JTextField(16);
JButton rest=new JButton("CE");
String buttons[]=
{
"7","8","9","/",
"4","5","6","*",
"1","2","3","+",
".","0","=","-"
};
JButton keys[]=new JButton[buttons.length];
JPanel jp1=new JPanel();
JPanel jp2=new JPanel();
public void addButtons()
{
jp2.setLayout(new GridLayout(4,4));
this.getContentPane().add(jp2);
for(int i=0;i<buttons.length;i++)
{
keys[i]=new JButton(buttons[i]);
jp2.add(keys[i]);
}
}
public MyCalculator()
{
super("我的计算器");
this.getContentPane().add(jp1,BorderLayout.NORTH);
jp1.add(jf);
//jf.setEditable(false);
//jf.setText("0");
jp1.add(rest);
addButtons();
this.setLocation(300,300);
this.setResizable(false);
this.setSize(250,250);
this.setVisible(true);
for(int i=0;i<buttons.length;i++)
{
keys[i].addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String cmd=e.getActionCommand();
if("1234567890.".indexOf(cmd)>=0)
{
seekkeys(cmd);
}else if("+-*/=".indexOf(cmd)>=0)
{
handlekeys(cmd);
}
}
});
}
rest.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
jf.setText("");
}
});
}
public void seekkeys(String key)
{
if(key.equals("."))
{
jf.setText(jf.getText()+".");
}
else
{
jf.setText(jf.getText()+key);
}
}
public void handlekeys(String key)
{
if(key.equals("+"))
{
startNumber +=getNumber();
}else if(key.equals("-"))
{
startNumber -=getNumber();
}else if(key.equals("*"))
{
startNumber *=getNumber();
}else if(key.equals("/"))
{
startNumber /=getNumber();
}else if(key.equals("="))
{
startNumber=getNumber();
}
jf.setText(String.valueOf(startNumber));
jf.setText("");
}
public double getNumber()
{
return Double.valueOf(jf.getText()).doubleValue();
}
public static void main(String []args)
{
new MyCalculator();
}
}
import javax.swing.*;
import java.awt.event.*;
public class MyCalculator extends JFrame
{
double startNumber=0.0;
JTextField jf=new JTextField(16);
JButton rest=new JButton("CE");
String buttons[]=
{
"7","8","9","/",
"4","5","6","*",
"1","2","3","+",
".","0","=","-"
};
JButton keys[]=new JButton[buttons.length];
JPanel jp1=new JPanel();
JPanel jp2=new JPanel();
public void addButtons()
{
jp2.setLayout(new GridLayout(4,4));
this.getContentPane().add(jp2);
for(int i=0;i<buttons.length;i++)
{
keys[i]=new JButton(buttons[i]);
jp2.add(keys[i]);
}
}
public MyCalculator()
{
super("我的计算器");
this.getContentPane().add(jp1,BorderLayout.NORTH);
jp1.add(jf);
//jf.setEditable(false);
//jf.setText("0");
jp1.add(rest);
addButtons();
this.setLocation(300,300);
this.setResizable(false);
this.setSize(250,250);
this.setVisible(true);
for(int i=0;i<buttons.length;i++)
{
keys[i].addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String cmd=e.getActionCommand();
if("1234567890.".indexOf(cmd)>=0)
{
seekkeys(cmd);
}else if("+-*/=".indexOf(cmd)>=0)
{
handlekeys(cmd);
}
}
});
}
rest.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
jf.setText("");
}
});
}
public void seekkeys(String key)
{
if(key.equals("."))
{
jf.setText(jf.getText()+".");
}
else
{
jf.setText(jf.getText()+key);
}
}
public void handlekeys(String key)
{
if(key.equals("+"))
{
startNumber +=getNumber();
}else if(key.equals("-"))
{
startNumber -=getNumber();
}else if(key.equals("*"))
{
startNumber *=getNumber();
}else if(key.equals("/"))
{
startNumber /=getNumber();
}else if(key.equals("="))
{
startNumber=getNumber();
}
jf.setText(String.valueOf(startNumber));
jf.setText("");
}
public double getNumber()
{
return Double.valueOf(jf.getText()).doubleValue();
}
public static void main(String []args)
{
new MyCalculator();
}
}
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;public class MyCalculator extends JFrame {
double startNumber = 0.0; JTextField jf = new JTextField(16); JButton rest = new JButton("CE"); String buttons[] = { "7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3",
"+", ".", "0", "=", "-" }; JButton keys[] = new JButton[buttons.length]; JPanel jp1 = new JPanel(); JPanel jp2 = new JPanel();
String type = "";
int len = 0;
public void addButtons() {
jp2.setLayout(new GridLayout(4, 4));
this.getContentPane().add(jp2);
for (int i = 0; i < buttons.length; i++) { keys[i] = new JButton(buttons[i]);
jp2.add(keys[i]);
}
} public MyCalculator() {
super("我的计算器");
this.getContentPane().add(jp1, BorderLayout.NORTH);
jp1.add(jf);
// jf.setEditable(false);
// jf.setText("0");
jp1.add(rest);
addButtons();
this.setLocation(300, 300);
this.setResizable(false);
this.setSize(250, 250);
this.setVisible(true);
for (int i = 0; i < buttons.length; i++) {
keys[i].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String cmd = e.getActionCommand();
if ("1234567890.".indexOf(cmd) >= 0) {
if(len==0)jf.setText("");
seekkeys(cmd);
len++;
} else if ("+-*/".indexOf(cmd) >= 0) {
if(jf.getText()!="")startNumber =new Double(jf.getText());
type=cmd;
len=0;
} else if ("=".indexOf(cmd) >= 0) {
handlekeys(type);
} }
});
}
rest.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jf.setText("");
startNumber=0; }
}); } public void seekkeys(String key) {
if (key.equals(".")) {
jf.setText(jf.getText() + "."); } else {
jf.setText(jf.getText() + key);
}
} public void handlekeys(String key) {
if (key.equals("+")) {
startNumber += getNumber();
} else if (key.equals("-")) {
startNumber -= getNumber();
} else if (key.equals("*")) {
startNumber *= getNumber();
} else if (key.equals("/")) {
startNumber /= getNumber();
}// else if (key.equals("=")) {
// startNumber = getNumber();
// }
jf.setText(String.valueOf(startNumber));// jf.setText("");
} public double getNumber() {
return Double.valueOf(jf.getText()).doubleValue();
} public static void main(String[] args) {
new MyCalculator();
}}
import javax.swing.*;
import java.awt.event.*;public class MyCalculator extends JFrame {
double startNumber = 0.0; JTextField jf = new JTextField(16); JButton rest = new JButton("CE"); String buttons[] = { "7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3",
"+", ".", "0", "=", "-" }; JButton keys[] = new JButton[buttons.length]; JPanel jp1 = new JPanel(); JPanel jp2 = new JPanel();
String type = "";
int len = 0,lenEqual = 0;
int second = 0;
public void addButtons() {
jp2.setLayout(new GridLayout(4, 4));
this.getContentPane().add(jp2);
for (int i = 0; i < buttons.length; i++) { keys[i] = new JButton(buttons[i]);
jp2.add(keys[i]);
}
} public MyCalculator() {
super("我的计算器");
this.getContentPane().add(jp1, BorderLayout.NORTH);
jp1.add(jf);
// jf.setEditable(false);
// jf.setText("0");
jp1.add(rest);
addButtons();
this.setLocation(300, 300);
this.setResizable(false);
this.setSize(250, 250);
this.setVisible(true);
for (int i = 0; i < buttons.length; i++) {
keys[i].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String cmd = e.getActionCommand();
if ("1234567890.".indexOf(cmd) >= 0) {
if(len==0)jf.setText("");
seekkeys(cmd);
len++;
} else if ("+-*/".indexOf(cmd) >= 0) {
if(jf.getText()!="")startNumber =new Double(jf.getText());
type=cmd;
len=0;
lenEqual=0;
} else if ("=".indexOf(cmd) >= 0) {
if(lenEqual==0)second=new Integer(jf.getText());
handlekeys(type);
lenEqual++;
}
}
});
}
rest.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jf.setText("");
startNumber=0;
lenEqual=0;
}
}); } public void seekkeys(String key) {
if (key.equals(".")) {
jf.setText(jf.getText() + ".");
} else {
jf.setText(jf.getText() + key);
}
} public void handlekeys(String key) {
if (key.equals("+")) {
startNumber += second;
} else if (key.equals("-")) {
startNumber -= second;
} else if (key.equals("*")) {
startNumber *= second;
} else if (key.equals("/")) {
startNumber /= second;
}
jf.setText(String.valueOf(startNumber)); } public static void main(String[] args) {
new MyCalculator();
}}