第1个回答 2012-03-27
//java版本的，你早晚能用到
package bag;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.SwingUtilities;
import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JTextField;
import java.awt.*;
import java.awt.event.*;
import javax.swing.JButton;
import java.awt.Dimension;
public class SCul extends JFrame {
private static final long serialVersionUID = 1L;
public JTextField jTextField1;
private static String s1,s2,s,s3,s4;
private static double result;
public Component createComponents(){
final JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20;
GridLayout gl1=new GridLayout(4,5);
JPanel panel1=new JPanel();
panel1.setLayout(gl1);
b1=new JButton("1"); b1.setText("1");b1.setForeground(Color.blue);
b2=new JButton("2"); b2.setText("2");b2.setForeground(Color.blue);
b3=new JButton("3"); b3.setText("3");b3.setForeground(Color.blue);
b6=new JButton("4"); b6.setText("4");b6.setForeground(Color.blue);
b7=new JButton("5"); b7.setText("5");b7.setForeground(Color.blue);
b8=new JButton("6"); b8.setText("6");b8.setForeground(Color.blue);
b11=new JButton("7"); b11.setText("7");b11.setForeground(Color.blue);
b12=new JButton("8"); b12.setText("8");b12.setForeground(Color.blue);
b13=new JButton("9"); b13.setText("9");b13.setForeground(Color.blue);
b16=new JButton("0"); b16.setText("0");b16.setForeground(Color.blue);
b4=new JButton("+"); b4.setText("+");b4.setForeground(Color.red);
b5=new JButton("C"); b5.setText("C");b5.setForeground(Color.red);
b9=new JButton("-"); b9.setText("-");b9.setForeground(Color.red);
b10=new JButton("退格"); b10.setText("退格");b10.setForeground(Color.red);
b14=new JButton("*"); b14.setText("*");b14.setForeground(Color.red);
b15=new JButton("1/x"); b15.setText("1/x");b15.setForeground(Color.blue);
b17=new JButton("+/-"); b17.setText("+/-");b17.setForeground(Color.blue);
b18=new JButton("."); b18.setText(".");b4.setForeground(Color.blue);
b19=new JButton("/"); b19.setText("/");b19.setForeground(Color.red);
b20=new JButton("="); b20.setText("=");b20.setForeground(Color.red);
//设置大小和颜色
b1.setSize(100, 100);
b2.setSize(100, 100);
b3.setSize(100, 100);
b4.setSize(100, 100);
b5.setSize(100, 100);
b6.setSize(100, 100);
b7.setSize(100, 100);
b8.setSize(100, 100);
b9.setSize(100, 100);
b10.setSize(100, 100);
b11.setSize(100, 100);
b12.setSize(100, 100);
b13.setSize(100, 100);
b14.setSize(100, 100);
b15.setSize(100, 100);
b16.setSize(100, 100);
b17.setSize(100, 100);
b18.setSize(100, 100);
b19.setSize(100, 100);
b20.setSize(100, 100);
panel1.add(b1);
panel1.add(b2);
panel1.add(b3);
panel1.add(b4);
panel1.add(b5);
panel1.add(b6);
panel1.add(b7);
panel1.add(b8);
panel1.add(b9);
panel1.add(b10);
panel1.add(b11);
panel1.add(b12);
panel1.add(b13);
panel1.add(b14);
panel1.add(b15);
panel1.add(b16);
panel1.add(b17);
panel1.add(b18);
panel1.add(b19);
panel1.add(b20);
panel1.setVisible(true);
b1.addActionListener(new ActionListener(){//按1
public void actionPerformed(ActionEvent e){
jTextField1.setText(jTextField1.getText().concat(b1.getText().toString()));
s=jTextField1.getText().toString();
}
});
b2.addActionListener(new ActionListener(){//按2
public void actionPerformed(ActionEvent e){
jTextField1.setText(jTextField1.getText().concat(b2.getText().toString()));
s=jTextField1.getText().toString();
}
});
b3.addActionListener(new ActionListener(){//按3
public void actionPerformed(ActionEvent e){
jTextField1.setText(jTextField1.getText().concat(b3.getText().toString()));
s=jTextField1.getText().toString();
}
});
b6.addActionListener(new ActionListener(){// 按4
public void actionPerformed(ActionEvent e){
jTextField1.setText(jTextField1.getText().concat(b6.getText().toString()));
s=jTextField1.getText().toString();
}
});
b7.addActionListener(new ActionListener(){//按5
public void actionPerformed(ActionEvent e){
jTextField1.setText(jTextField1.getText().concat(b7.getText().toString()));
s=jTextField1.getText().toString();
}
});
b8.addActionListener(new ActionListener(){//按6
public void actionPerformed(ActionEvent e){
jTextField1.setText(jTextField1.getText().concat(b8.getText().toString()));
s=jTextField1.getText().toString();
}
});
b11.addActionListener(new ActionListener(){//按7
public void actionPerformed(ActionEvent e){
jTextField1.setText(jTextField1.getText().concat(b11.getText().toString()));
s=jTextField1.getText().toString();
}
});
b12.addActionListener(new ActionListener(){//按8
public void actionPerformed(ActionEvent e){
jTextField1.setText(jTextField1.getText().concat(b12.getText().toString()));
s=jTextField1.getText().toString();
}
});
b13.addActionListener(new ActionListener(){//按9
public void actionPerformed(ActionEvent e){
jTextField1.setText(jTextField1.getText().concat(b13.getText().toString()));
s=jTextField1.getText().toString();
}
});
b16.addActionListener(new ActionListener(){//按0
public void actionPerformed(ActionEvent e){
jTextField1.setText(jTextField1.getText().concat(b16.getText().toString()));
s=jTextField1.getText().toString();
}
});
b4.addActionListener(new ActionListener(){//按+
public void actionPerformed(ActionEvent e){
if(s=="")
{
s="0";
jTextField1.setText(s);
}
else{
s1=s;//将第一操作数保存至s1
s3="+";
jTextField1.setText(jTextField1.getText().concat(b4.getText().toString()));
s=jTextField1.getText().toString();
}
}
});
b9.addActionListener(new ActionListener(){//按-
public void actionPerformed(ActionEvent e){
if(s=="")
{
s="0";
jTextField1.setText(s);
}
else{
s1=s;//将第一操作数保存至s1
s3="-";
jTextField1.setText(jTextField1.getText().concat(b9.getText().toString()));
s=jTextField1.getText().toString();
}
}
});
b14.addActionListener(new ActionListener(){//按*
public void actionPerformed(ActionEvent e){
if(s=="")
{
s="0";
jTextField1.setText(s);
}
else{
s1=s;//将第一操作数保存至s1
s3="*";
jTextField1.setText(jTextField1.getText().concat(b14.getText().toString()));
s=jTextField1.getText().toString();
}
}
});
b19.addActionListener(new ActionListener(){//按/
public void actionPerformed(ActionEvent e){
if(s=="")
{
s="0";
jTextField1.setText(s);
}
else{
s1=s;//将第一操作数保存至s1
s3="/";
jTextField1.setText(jTextField1.getText().concat(b19.getText().toString()));
s=jTextField1.getText().toString();
}
}
});
b5.addActionListener(new ActionListener(){//按C清零
public void actionPerformed(ActionEvent e){
s="0";
jTextField1.setText(s);
}
});
b10.addActionListener(new ActionListener(){//按退格
public void actionPerformed(ActionEvent e){
int l=s.length();
if(l!=0)
s=s.substring(0, l-1);//删除一个字符
else
{
s="0";
s4="+";
}
jTextField1.setText(s);//将删除后的字符串显示到单行编辑框中
}
});
b15.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){//求倒数
if(s=="" || s=="0")
{
s="0";
jTextField1.setText("0");
}
else{
result=1/Double.parseDouble(s);
s=String.valueOf(result);
jTextField1.setText(s4+s);
}
}
});
b17.addActionListener(new ActionListener(){//按+/-
public void actionPerformed(ActionEvent e){
if(s=="")
{
jTextField1.setText("0");
}else{
if(s4=="+")
{ s4="-";
jTextField1.setText(s4+s);
}
else{
s4="+";
jTextField1.setText(s4+s);
}
}
}
});
b18.addActionListener(new ActionListener(){//按.
public void actionPerformed(ActionEvent e){
jTextField1.setText(jTextField1.getText().concat(b18.getText().toString()));
s=jTextField1.getText().toString();
}
});
b20.addActionListener(new ActionListener(){//按=求结果
public void actionPerformed(ActionEvent e){//求结果
if(s=="")
{
s="0";
s4="+";
s3="";
jTextField1.setText(s);
}
else if(s!=""){
int m1=s.indexOf(s3);
s1=s.substring(0, m1);
s2=s.substring(m1+1, s.length());
if(s4=="+"){
if(s3=="+")
result=Double.parseDouble(s1)+Double.parseDouble(s2);
if(s3=="-")
result=Double.parseDouble(s1)-Double.parseDouble(s2);
if(s3=="*")
result=Double.parseDouble(s1)*Double.parseDouble(s2);
if(s3=="/" && s2!="0" && s2!="")
result=Double.parseDouble(s1)/Double.parseDouble(s2);
if(s3=="/" && (s2=="0" || s2==""))
result=00.00;
s=String.valueOf(result);
}
else if(s4=="-"){
if(s3=="+"){
result=Double.parseDouble(s2)-Double.parseDouble(s1);
s=String.valueOf(result);
}
if(s3=="-"){
result=Double.parseDouble(s1)+Double.parseDouble(s2);
s="-"+String.valueOf(result);
}
if(s3=="*"){
result=Double.parseDouble(s1)*Double.parseDouble(s2);
s="-"+String.valueOf(result);
}
if(s3=="/" && (s2!="0" || s2!="")){
result=Double.parseDouble(s1)/Double.parseDouble(s2);
s="-"+String.valueOf(result);
}
if(s3=="/" && s2=="0" && s2=="")
{
s="00.00";
}
}
jTextField1.setText(s);
}
}
});
return panel1;
}
public static void main(String[] args) {
SCul cul1=new SCul();
JFrame frame1=new JFrame("计算器");
frame1.setBackground(Color.lightGray);
frame1.add(cul1.jTextField1,BorderLayout.NORTH);
frame1.setResizable(false);
Component contents=cul1.createComponents();
frame1.getContentPane().add(contents, BorderLayout.SOUTH);
frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame1.pack();
frame1.setVisible(true);
}
/**
* This is the default constructor
*/
public SCul() {
super();
jTextField1=new JTextField();
s="";
s1="";
s2="";
s3="";
s4="+";
jTextField1.setText(s);
jTextField1.setHorizontalAlignment(JTextField.RIGHT);
}
}
一个简单的计算器如图所示，使用“计算器”可以完成任意的的标准运算，“计算器”可用于基本的算术运算，比如加减运算等。