Java 基础常用功能语句

 
2009-08-18 15:49
////设置居中（注意，要在设置窗体大小下面设置该句）
this.setLocationRelativeTo(null);
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String[] kecheng = {"Java","英语","数学"};
   JComboBox jComboBox3 = new JComboBox(kecheng);  
JComboBox jComboBox2 = new JComboBox();
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int t=Integer.valueOf( k).intValue();    /////数值转化
this.year=String.valueOf(ca1.get(Calendar.YEAR));    /////字符转化                            
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ResultSet rest=stmt.executeQuery("select 字段from表")// 显示下一条
rest.next();
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'\n' 回车换行
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//获取日期差，返回相差天数。
//日期格式：2005-01-01
//Author : Meanson Wang
/
static long getCompareDate(String startDate,String endDate) throws ParseException {
      SimpleDateFormat formatter=new SimpleDateFormat("yyyy-MM-dd");
  
    Date date1=formatter.parse(startDate);    
   
   Date date2=formatter.parse(endDate);
     
long l = date2.getTime() - date1.getTime();
      long d = l/(24*60*60*1000);
      return d;
}
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String DATA_FORMAT="yyyy-MM-dd";
java.text.SimpleDateForma sdf=new java.text.SimpleDateForma(DATA_FORMAT);
Calendar c1=Calendar.getInstance();
c1.set
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获得当前系统时间
import java.util.*;
在类里定义一个对象
Calendar ca1=Calendar.getInstance();
在void jbInit() throws Exception {里定义
this.year=String.valueOf(ca1.get(Calendar.YEAR));
      this.month=String.valueOf(ca1.get(Calendar.MONTH));
       this.day=String.valueOf(ca1.get(Calendar.DATE));
/////
jTextAr