java 简单计算器
今天没事，拿java做了一个简单的计算器，带时间显示。以此用了用swing和awt的一些组件。初次写
这种东西写起来还真费时间，还真是跟c++不一样。不过还是很有趣的...还有好多东西没有完善,以后
再弄。代码贴出来供大家bs....或许用java弄个扫雷也很有趣...
这种东西写起来还真费时间，还真是跟c++不一样。不过还是很有趣的...还有好多东西没有完善,以后
再弄。代码贴出来供大家bs....或许用java弄个扫雷也很有趣...
import
java.awt.
*
;
import java.awt.event. * ;
import java.lang. * ;
import javax.swing. * ;
import java.util. * ;
import java.math. * ;
public class Cal{
static Frame frm = new Frame( " Calculator " ); // frame
static JTextField txt = new JTextField( " 0 " ); // text
static JTextField time = new JTextField( " 00:00:00 " ); // time
// static Date hour=new Date(),min=new Date(),sec=new Date();
static Button btn[] = new Button[ 30 ]; // button
static Dialog dlg = new Dialog(frm); // dlg
static Thread thd = new Thread();
static String btn_name[] = { " MC " , " 7 " , " 8 " , " 9 " , " / " , " sqrt " , " MR " , " 4 " , " 5 " , " 6 " , " * " , " % " ,
" MS " , " 1 " , " 2 " , " 3 " , " - " , " 1/x " , " M+ " , " 0 " , " +/- " , " . " , " + " , " = " ,
" Backspace " , " CE " , " C " , " close " , " cancel " }; // button_name Array_size=29
static String op = "" ;
static double ans = 0 ,x = 0 ,y = 0 ; // ans
static StringBuffer str = new StringBuffer( "" ); // Str_buffer to read number
static Panel pn1 = new Panel(); // panel
static Panel pn2 = new Panel();
public Cal(){//构造函数
// frame
frm.setLayout( null );
frm.setLocation( 250 , 250 );
frm.setSize( 350 , 300 );
frm.setBackground(Color.DARK_GRAY);
frm.setResizable( false );
frm.setVisible( true );
frm.addWindowListener( new WinLis());
// text
txt.setForeground(Color.yellow);
txt.setBackground(Color.gray);
txt.setBounds( 90 , 40 , 230 , 30 ); // 输出显示
txt.setHorizontalAlignment(JTextField.RIGHT);
txt.setEditable( false );
frm.add(txt);
time.setForeground(Color.yellow);
time.setBackground(Color.gray);
time.setBounds( 20 , 40 , 60 , 30 ); // 时间显示
time.setHorizontalAlignment(JTextField.CENTER);
time.setEditable( false );
frm.add(time);
// panel&&button
GridLayout grid1 = new GridLayout( 4 , 6 );
GridLayout grid2 = new GridLayout( 1 , 3 );
pn1.setLayout(grid1);
pn2.setLayout(grid2);
pn1.setBounds( 20 , 120 , 300 , 150 );
pn2.setBounds( 20 , 80 , 300 , 30 );
for ( int i = 0 ;i < 24 ;i ++ ){
btn[i] = new Button(btn_name[i]);
btn[i].setForeground(Color.red);
btn[i].setBackground(Color.yellow);
btn[i].addActionListener( new ActLis());
pn1.add(btn[i]);
}
frm.add(pn1);
for ( int i = 24 ;i < 27 ;i ++ ){
btn[i] = new Button(btn_name[i]);
btn[i].setForeground(Color.red);
btn[i].setBackground(Color.blue);
btn[i].addActionListener( new ActLis());
pn2.add(btn[i]);
}
frm.add(pn2);
// dialog &btn
btn[ 27 ] = new Button(btn_name[ 27 ]);
btn[ 28 ] = new Button(btn_name[ 28 ]);
btn[ 27 ].setBackground(Color.blue);
btn[ 28 ].setBackground(Color.blue);
btn[ 27 ].setForeground(Color.yellow);
btn[ 28 ].setForeground(Color.yellow);
dlg.setTitle( " 确定要关闭 " );
dlg.setSize( 200 , 150 );
dlg.setLayout( new FlowLayout(FlowLayout.CENTER, 5 , 30 ));
dlg.setBackground(Color.white);
dlg.add(btn[ 27 ]);
dlg.add(btn[ 28 ]);
}
static class thread extends Thread{ // 时间显示线程
public thread(){
thd = new Thread( this );
thd.start();
}
public void run(){
while ( true ){
Integer a = new Date().getHours(),b = new Date().getMinutes(),c = new Date().getSeconds();
String aa = new String( "" ),bb = new String( "" ),cc = new String( "" );
if (a < 10 ) aa = " 0 " + a.toString(); else aa = a.toString();
if (b < 10 ) bb = " 0 " + b.toString(); else bb = b.toString();
if (c < 10 ) cc = " 0 " + c.toString(); else cc = c.toString();
time.setText(aa + " : " + bb + " : " + cc);
try {
thd.sleep( 100 );
}
catch (InterruptedException ie){
System.out.println( "" + ie);
}
}
}
}
public class WinLis extends WindowAdapter{ // WinLis
public void windowClosing(WindowEvent e1){
// frm.dispose();
// System.exit(0);
dlg.setLocation( 200 , 300 );
dlg.show( true );
}
}
static class ActLis implements ActionListener{ // ActionListener
public void actionPerformed(ActionEvent e2){
Button bt = (Button)e2.getSource();
if (bt == btn[ 27 ]){
frm.dispose();
System.exit( 0 );
}
else if (bt == btn[ 28 ]) dlg.hide();
else if (bt == btn[ 24 ]){ // "Backspace"键
if ( ! txt.getText().trim().equals( " 0 " )){
if (str.length() != 1 ){
txt.setText(str.delete(str.length() - 1 ,str.length()).toString());
}
else {
txt.setText( " 0 " );
str.setLength( 0 ); // str长度清零
}
}
y = Double.parseDouble(txt.getText().trim());
}
else if (bt == btn[ 25 ] || bt == btn[ 26 ]){txt.setText( " 0 " );str.setLength( 0 );} // "CE"or"C"
// else if(bt==btn[0]){} // btn[0]"MC" btn[6]"MR" btn[12]"MS" btn[18]"M+"
else if (bt == btn[ 4 ]) { // "/" 号
op = " / " ;
x = Double.parseDouble(txt.getText().trim());y = 0 ;
str.setLength( 0 );
}
else if (bt == btn[ 5 ]){ // "sqrt"号
x = Double.parseDouble(txt.getText().trim());y = 0 ;
if (x < 0 ) txt.setText( " invalid " );
else txt.setText( "" + Math.sqrt(x));
str.setLength( 0 );
}
else if (bt == btn[ 10 ]){ // "*"号
op = " * " ;
x = Double.parseDouble(txt.getText().trim());y = 0 ;
str.setLength( 0 );
}
else if (bt == btn[ 11 ]) { // "%"号
x = Double.parseDouble(txt.getText().trim());y = 0 ;
txt.setText( "" + x / 100 );
str.setLength( 0 );
}
else if (bt == btn[ 16 ]){ // "-"号
op = " - " ;
x = Double.parseDouble(txt.getText().trim());y = 0 ;
str.setLength( 0 );
}
else if (bt == btn[ 17 ]){ // "1/x"号
x = Double.parseDouble(txt.getText().trim());y = 0 ;
if (x == 0 ) txt.setText( " invalid " );
else txt.setText( "" + 1 / x);
str.setLength( 0 );
}
else if (bt == btn[ 22 ]){ // "+"号
op = " + " ;
x = Double.parseDouble(txt.getText().trim());y = 0 ;
str.setLength( 0 );
}
else if (bt == btn[ 21 ]){ // "." 号
if (txt.getText().trim().indexOf( ' . ' ) ==- 1 ) txt.setText(str.append( " . " ).toString());
else {
txt.setText( " invalid " );
str.setLength( 0 );
x = 0 ;y = 0 ;
}
}
else if (bt == btn[ 23 ]){ // "="号
if (y == 0 && op == " / " ) txt.setText( " invalid " );
else txt.setText( "" + calculate());
str.setLength( 0 );
x = Double.parseDouble(txt.getText().trim());y = 0 ;op = "" ;
}
else { // 按下数字键
txt.setText(str.append(e2.getActionCommand()).toString());
y = Double.parseDouble(txt.getText().trim());
}
}
public double calculate(){
if (op == " + " ) return x + y;
else if (op == " - " ) return x - y;
else if (op == " * " ) return x * y;
else if (op == "" ) return y;
else {
// if(y==0) {txt.setText("invalid");
return x / y;
}
}
}
public static void main(String args[]){
Cal calculator = new Cal();
thread new_thd = new thread();
}
}
import java.awt.event. * ;
import java.lang. * ;
import javax.swing. * ;
import java.util. * ;
import java.math. * ;
public class Cal{
static Frame frm = new Frame( " Calculator " ); // frame
static JTextField txt = new JTextField( " 0 " ); // text
static JTextField time = new JTextField( " 00:00:00 " ); // time
// static Date hour=new Date(),min=new Date(),sec=new Date();
static Button btn[] = new Button[ 30 ]; // button
static Dialog dlg = new Dialog(frm); // dlg
static Thread thd = new Thread();
static String btn_name[] = { " MC " , " 7 " , " 8 " , " 9 " , " / " , " sqrt " , " MR " , " 4 " , " 5 " , " 6 " , " * " , " % " ,
" MS " , " 1 " , " 2 " , " 3 " , " - " , " 1/x " , " M+ " , " 0 " , " +/- " , " . " , " + " , " = " ,
" Backspace " , " CE " , " C " , " close " , " cancel " }; // button_name Array_size=29
static String op = "" ;
static double ans = 0 ,x = 0 ,y = 0 ; // ans
static StringBuffer str = new StringBuffer( "" ); // Str_buffer to read number
static Panel pn1 = new Panel(); // panel
static Panel pn2 = new Panel();
public Cal(){//构造函数
// frame
frm.setLayout( null );
frm.setLocation( 250 , 250 );
frm.setSize( 350 , 300 );
frm.setBackground(Color.DARK_GRAY);
frm.setResizable( false );
frm.setVisible( true );
frm.addWindowListener( new WinLis());
// text
txt.setForeground(Color.yellow);
txt.setBackground(Color.gray);
txt.setBounds( 90 , 40 , 230 , 30 ); // 输出显示
txt.setHorizontalAlignment(JTextField.RIGHT);
txt.setEditable( false );
frm.add(txt);
time.setForeground(Color.yellow);
time.setBackground(Color.gray);
time.setBounds( 20 , 40 , 60 , 30 ); // 时间显示
time.setHorizontalAlignment(JTextField.CENTER);
time.setEditable( false );
frm.add(time);
// panel&&button
GridLayout grid1 = new GridLayout( 4 , 6 );
GridLayout grid2 = new GridLayout( 1 , 3 );
pn1.setLayout(grid1);
pn2.setLayout(grid2);
pn1.setBounds( 20 , 120 , 300 , 150 );
pn2.setBounds( 20 , 80 , 300 , 30 );
for ( int i = 0 ;i < 24 ;i ++ ){
btn[i] = new Button(btn_name[i]);
btn[i].setForeground(Color.red);
btn[i].setBackground(Color.yellow);
btn[i].addActionListener( new ActLis());
pn1.add(btn[i]);
}
frm.add(pn1);
for ( int i = 24 ;i < 27 ;i ++ ){
btn[i] = new Button(btn_name[i]);
btn[i].setForeground(Color.red);
btn[i].setBackground(Color.blue);
btn[i].addActionListener( new ActLis());
pn2.add(btn[i]);
}
frm.add(pn2);
// dialog &btn
btn[ 27 ] = new Button(btn_name[ 27 ]);
btn[ 28 ] = new Button(btn_name[ 28 ]);
btn[ 27 ].setBackground(Color.blue);
btn[ 28 ].setBackground(Color.blue);
btn[ 27 ].setForeground(Color.yellow);
btn[ 28 ].setForeground(Color.yellow);
dlg.setTitle( " 确定要关闭 " );
dlg.setSize( 200 , 150 );
dlg.setLayout( new FlowLayout(FlowLayout.CENTER, 5 , 30 ));
dlg.setBackground(Color.white);
dlg.add(btn[ 27 ]);
dlg.add(btn[ 28 ]);
}
static class thread extends Thread{ // 时间显示线程
public thread(){
thd = new Thread( this );
thd.start();
}
public void run(){
while ( true ){
Integer a = new Date().getHours(),b = new Date().getMinutes(),c = new Date().getSeconds();
String aa = new String( "" ),bb = new String( "" ),cc = new String( "" );
if (a < 10 ) aa = " 0 " + a.toString(); else aa = a.toString();
if (b < 10 ) bb = " 0 " + b.toString(); else bb = b.toString();
if (c < 10 ) cc = " 0 " + c.toString(); else cc = c.toString();
time.setText(aa + " : " + bb + " : " + cc);
try {
thd.sleep( 100 );
}
catch (InterruptedException ie){
System.out.println( "" + ie);
}
}
}
}
public class WinLis extends WindowAdapter{ // WinLis
public void windowClosing(WindowEvent e1){
// frm.dispose();
// System.exit(0);
dlg.setLocation( 200 , 300 );
dlg.show( true );
}
}
static class ActLis implements ActionListener{ // ActionListener
public void actionPerformed(ActionEvent e2){
Button bt = (Button)e2.getSource();
if (bt == btn[ 27 ]){
frm.dispose();
System.exit( 0 );
}
else if (bt == btn[ 28 ]) dlg.hide();
else if (bt == btn[ 24 ]){ // "Backspace"键
if ( ! txt.getText().trim().equals( " 0 " )){
if (str.length() != 1 ){
txt.setText(str.delete(str.length() - 1 ,str.length()).toString());
}
else {
txt.setText( " 0 " );
str.setLength( 0 ); // str长度清零
}
}
y = Double.parseDouble(txt.getText().trim());
}
else if (bt == btn[ 25 ] || bt == btn[ 26 ]){txt.setText( " 0 " );str.setLength( 0 );} // "CE"or"C"
// else if(bt==btn[0]){} // btn[0]"MC" btn[6]"MR" btn[12]"MS" btn[18]"M+"
else if (bt == btn[ 4 ]) { // "/" 号
op = " / " ;
x = Double.parseDouble(txt.getText().trim());y = 0 ;
str.setLength( 0 );
}
else if (bt == btn[ 5 ]){ // "sqrt"号
x = Double.parseDouble(txt.getText().trim());y = 0 ;
if (x < 0 ) txt.setText( " invalid " );
else txt.setText( "" + Math.sqrt(x));
str.setLength( 0 );
}
else if (bt == btn[ 10 ]){ // "*"号
op = " * " ;
x = Double.parseDouble(txt.getText().trim());y = 0 ;
str.setLength( 0 );
}
else if (bt == btn[ 11 ]) { // "%"号
x = Double.parseDouble(txt.getText().trim());y = 0 ;
txt.setText( "" + x / 100 );
str.setLength( 0 );
}
else if (bt == btn[ 16 ]){ // "-"号
op = " - " ;
x = Double.parseDouble(txt.getText().trim());y = 0 ;
str.setLength( 0 );
}
else if (bt == btn[ 17 ]){ // "1/x"号
x = Double.parseDouble(txt.getText().trim());y = 0 ;
if (x == 0 ) txt.setText( " invalid " );
else txt.setText( "" + 1 / x);
str.setLength( 0 );
}
else if (bt == btn[ 22 ]){ // "+"号
op = " + " ;
x = Double.parseDouble(txt.getText().trim());y = 0 ;
str.setLength( 0 );
}
else if (bt == btn[ 21 ]){ // "." 号
if (txt.getText().trim().indexOf( ' . ' ) ==- 1 ) txt.setText(str.append( " . " ).toString());
else {
txt.setText( " invalid " );
str.setLength( 0 );
x = 0 ;y = 0 ;
}
}
else if (bt == btn[ 23 ]){ // "="号
if (y == 0 && op == " / " ) txt.setText( " invalid " );
else txt.setText( "" + calculate());
str.setLength( 0 );
x = Double.parseDouble(txt.getText().trim());y = 0 ;op = "" ;
}
else { // 按下数字键
txt.setText(str.append(e2.getActionCommand()).toString());
y = Double.parseDouble(txt.getText().trim());
}
}
public double calculate(){
if (op == " + " ) return x + y;
else if (op == " - " ) return x - y;
else if (op == " * " ) return x * y;
else if (op == "" ) return y;
else {
// if(y==0) {txt.setText("invalid");
return x / y;
}
}
}
public static void main(String args[]){
Cal calculator = new Cal();
thread new_thd = new thread();
}
}