应用软件打包出品
――以Java计算器小软件为例
程序设计（源程序清单）
package cal;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class MyJButtons implementsActionListener {
String[] keys={"7","8","9","/","4","5","6",
"*","1","2","3","-","0",".","=","+","Clear"};
JButton[] keyb = new JButton[keys.length];
JTextField t;
double num1=0.0,num2;
intflag=0;
intn=1;
intmath=0;
MyJButtons(JTextField t){
this.t=t;
for( int i = 0; i <keys.length; i++ ) {
keyb[i]=new JButton(keys[i]);
keyb[i].addActionListener(this);
}
}
public void actionPerformed(ActionEvent e){
Object JButton=e.getSource();
String s1=JButton+"";
int l=s1.indexOf("text=");
String s2=s1.substring(l+5);
char c=s2.charAt(0);
String s;
if(c=='C'){
t.setText("0");
num1=0;
flag=0;
}
if((int)(c-'0')>=0&&(int)c<=(int)'9'){
if (flag==0){
t.setText(c+"");
flag=1;
}
else{
t.setText(t.getText()+c);
}
}
else if(c=='+'||c=='-'||c=='*'||c=='/'||c=='='){
num2=Double.parseDouble(t.getText());
flag=0;
switch(math){
case 0:{
num1=num2;
t.setText(num1+"");
break;
}
case 1:{
num1=num1+num2;
t.setText(num1+"");
break;
}
case 2:{
num1=num1-num2;
t.setText(num1+"");
break;
}
case 3:{
num1=num1*num2;
t.setText(num1+"");
break;
}
case 4:{
if(num2==0){
t.setText("Error!");
num1=0.0;
}else{
num1=num1/num2;
t.setText(num1+"");
}
break;
}
}
if(c=='+') math=1;
else if(c=='-')math=2;
else if(c=='*')math=3;
else if(c=='/')math=4;
else math=0;
}
else if(c=='.'){
s=t.getText();
if(s.indexOf(".")==-1){
t.setText(s+c);
}
else if(flag==0){
t.setText(".");
flag=1;
}
}
}
}
class MyText extends JTextField{
MyText(int w){
super(w);
this.setText("0.0");
this.setEditable( false );
this.setHorizontalAlignment(this.RIGHT);
}
}
public class Calculator extends JFrame {
MyText t= new MyText(13);
MyJButtons keyJButton=new MyJButtons(t);
public Calculator() {
super("计算器");
setDefaultCloseOperation(EXIT_ON_CLOSE );
Container cc = getContentPane();
cc.setLayout( new BorderLayout() );
JPanel p = new JPanel();
p.setLayout( new GridLayout(4,4,0,2));
for( int i = 0;i <keyJButton.keyb.length-1; i++ ) {
p.add(keyJButton.keyb[i]);
}
cc.add( t, "North" );
cc.add( p, "Center" );
cc.add( keyJButton.keyb[keyJButton.keyb.length-1], "South" );
pack();
this.setLocation(350,300);
this.setResizable(false);
this.setVisible(true);
}
public static void main( String[] args ) {
new Calculator();
}
}
编译生成相关的class文件
编译、纠错，调试成功生成三个class文件
cal
+-----Calculator.class
+-----MyJButtons.class
+-----Mytext.class
创建标明文件设置主类
创建标明文件(manifest.mf)
Main-Class: cal.Calculator(回车)
说明：可执行主类全名(包含包名)，前面必须有一个空格。
此时的目录结构
|
javatry | +-----cal +-----Calculator.class +-----MyButtons.class +-----Mytext.class +-----manifest.mf |
打包成可执行的jar文件包
打包命令：jar cvfm cal.jarmanifest.mfcal/.
此时的目录结构
|
javatry | +-----cal +-----Calculator.class +-----MyButtons.class +-----Mytext.class +-----manifest.mf +-----cal.jar |
打包成功后，双击cal.jar即可执行。
