Java Useful Program(1)

public static void main(String[] args){
//字符串有整型的相互转换
String str=String.valueOf(123);
int i=Integer.parseInt(str);
System.out.println(i);
//向文件末尾添加内容
BufferedWriter out = null;
try{
out = new BufferedWriter(new FileWriter("c://logs//log.out", true));
out.write("aString");
}catch(IOException ex){
System.out.println(ex.getMessage());
}finally{
if(out!=null){
try {
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
//得到当前方法的名字
String methodName = Thread.currentThread().getStackTrace()[1].getMethodName();
System.out.println(methodName);

//转字符串到日期
SimpleDateFormat format = new SimpleDateFormat( "dd.MM.yyyy" );
try {
Date date = format.parse("01.01.2013");
System.out.println(date);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

//把 Java util.Date 转成 sql.Date
java.util.Date utilDate = new java.util.Date();
java.sql.Date sqlDate = new java.sql.Date(utilDate.getTime());
System.out.println(sqlDate);

//使用NIO进行快速的文件拷贝
File f1=new File("c://logs//log.out");
File f2=new File("c://logs//log1.out");
FileChannel inChannel=null;
FileChannel outChannel=null;
try {
inChannel = new FileInputStream(f1).getChannel();
outChannel = new FileOutputStream(f2).getChannel();
try{
int maxCount = (64 * 1024 * 1024) - (32 * 1024);
long size = inChannel.size();
long position = 0;
while ( position < size ){
position += inChannel.transferTo( position, maxCount, outChannel );

}
}catch(FileNotFoundException ex){
ex.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(inChannel!=null){
try {
inChannel.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(outChannel!=null){
try {
outChannel.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

}

Output:

123
main
Tue Jan 01 00:00:00 CST 2013
2013-06-17