overload和override的区别

Overload是重载的意思，Override是覆盖的意思，也就是重写。 1.Overload(重载)表示同一个类中可以有多个名称相同的方法，但这些方法的参数个数或类型不相同。

package com.juziku;

import java.util.Calendar;
import java.util.Date;

/**
 * 方法重载
 * @author sunlightcs
 * 2011-3-1
 * http://hi.juziku.com/sunlightcs/
 */
public class OverLoad {
	Date curDate = null;
	
	/**
	 * 无参的构造函数
	 */
	public OverLoad(){
		this.curDate = new Date();
	}
	
	/**
	 * 带参数的构造函数
	 */
	public OverLoad(Date date){
		this.curDate = date;
	}
	
	/**
	 * 根据时间，获得星期几
	 * @return  返回星期几
	 */
	public int getWeek(){
		return this.getWeek(this.curDate);
	}
	
	/**
	 * 根据时间，获得星期几
	 * @param date  时间
	 * @return  返回星期几
	 */
	public int getWeek(Date date){
		int dayForWeek = 0;
		
		Calendar c = Calendar.getInstance();
		c.setTime(date);
		if (c.get(Calendar.DAY_OF_WEEK) == 1) {
			dayForWeek = 7;
		} else {
			dayForWeek = c.get(Calendar.DAY_OF_WEEK) - 1;
		}
		return dayForWeek;
	}
	
	public static void main(String[] args) {
		OverLoad overLoad1 = new OverLoad();
		OverLoad overLoad2 = new OverLoad(new Date());
		System.out.println(overLoad1.getWeek());
		System.out.println(overLoad1.getWeek(new Date()));
		
		System.out.println(overLoad2.getWeek());
	}
	
}

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