Java获取各种常用时间方法

package com.test;


import java.text.DateFormat;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

public class TimeTest {
//用来全局控制 上一周，本周，下一周的周数变化
private int weeks = 0 ;
private int MaxDate; //一月最大天数
private int MaxYear; //一年最大天数


/**
* @param args
*/
public static void main(String[] args) {
TimeTest tt = new TimeTest();
System.out.println( "获取当天日期:" +tt.getNowTime( "yyyy-MM-dd" ));
System.out.println( "获取本周一日期:" +tt.getMondayOFWeek());
System.out.println( "获取本周日的日期~:" +tt.getCurrentWeekday());
System.out.println( "获取上周一日期:" +tt.getPreviousWeekday());
System.out.println( "获取上周日日期:" +tt.getPreviousWeekSunday());
System.out.println( "获取下周一日期:" +tt.getNextMonday());
System.out.println( "获取下周日日期:" +tt.getNextSunday());
System.out.println( "获得相应周的周六的日期:" +tt.getNowTime( "yyyy-MM-dd" ));
System.out.println( "获取本月第一天日期:" +tt.getFirstDayOfMonth());
System.out.println( "获取本月最后一天日期:" +tt.getDefaultDay());
System.out.println( "获取上月第一天日期:" +tt.getPreviousMonthFirst());
System.out.println( "获取上月最后一天的日期:" +tt.getPreviousMonthEnd());
System.out.println( "获取下月第一天日期:" +tt.getNextMonthFirst());
System.out.println( "获取下月最后一天日期:" +tt.getNextMonthEnd());
System.out.println( "获取本年的第一天日期:" +tt.getCurrentYearFirst());
System.out.println( "获取本年最后一天日期:" +tt.getCurrentYearEnd());
System.out.println( "获取去年的第一天日期:"