请问此程序错在哪里？怎么改？

Question

import java.io.*;
import java.util.*;
class Logger{
public void Log() throws Exception{
PrintStream logps;
GregorianCalendar now;
logps=new PrintStream(new FileOutputStream("log"));
now=new GregorianCalendar();
logps.println(now.getTime());
}
public void logWithTZ() throws Exception
{PrintStream logps;
GregorianCalendar now;
logps=new PrintStream(new FileOutputStream("log"));
now=new GregorianCalendar();
logps.print(now.getTimeZone().getDisplayName()+" ");
logps.println(now.getTime());
}
}

Answer 1

类名Logger 和构造函数的名称不一致啊。

Answer 2

main方法没有啊
public static void main(String[] args)throws Exception
{
Logger logg = new Logger();
logg.Log();
logg.logWithTZ();
}
还有这个语句logps=new PrintStream(new FileOutputStream("log"));
log是写如数据的文件,应该加个后缀吧,log.txt完整的程序如下:
import java.io.*;
import java.util.*;
class Logger{
public void Log() throws Exception{
PrintStream logps;
GregorianCalendar now;
logps=new PrintStream(new FileOutputStream("log.txt"));
now=new GregorianCalendar();
logps.println(now.getTime());
}
public void logWithTZ() throws Exception
{PrintStream logps;
GregorianCalendar now;
logps=new PrintStream(new FileOutputStream("log2.txt"));
now=new GregorianCalendar();
logps.print(now.getTimeZone().getDisplayName()+" ");
logps.println(now.getTime());
}
public static void main(String[] args)throws Exception
{
Logger logg = new Logger();
logg.Log();
logg.logWithTZ();
}
}
运行完后在当前目录下有log.txt和log2.txt

Answer 3

没有main函数不 行的吧！这个错误最明显了