你想问什么? Integer i =new Integer(5);
Integer j=new Integer(0);
j=i;
i++;
i = 5 ; j = 0 ;j=i j=i=5 ;
i++ ; i = 6 ;
Integer j=new Integer(0);
j=i;
i++;
i = 5 ; j = 0 ;j=i j=i=5 ;
i++ ; i = 6 ;
public static void main(String[] args) {
// TODO Auto-generated method stub
Integer i =new Integer(5); //i=5;
Integer j=new Integer(0); //j=0;
j=i; //j=5;
i++; //i=5+1;
String str1 = new String("str1"); //str1 = "str1";
//String str2 = new String("str2");
String str2 = str1; //str2 = "str1";
str1 = "changed"; //str1 = "changed";
Date date = new Date(); //date = "2010-01-20 14:55:01";after simpledateformate.formate(date)
Date date2 = date; //date2 = "2010-01-20 14:55:01";after simpledateformate.formate(date)
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Long dateL = (date.getTime() / 1000) - 60 * 60;
date.setTime(dateL * 1000); //now date and date2 both changed becaused the value of them referenced both changed;
//String stateTime = dateFormat.format(date); System.out.println("date:"+date+"\ndate2:"+date2+"\ni:"+i+"\nj:"+j+"\nstr1:"+str1+"\nstr2:"+str2);
}
integer是对象,用一个引用指向这个对象
所有来补下基础.哎,薄弱了
解释:date:星期三 一月20号 13点54分04秒 美国中部标准时间 2010年
剩下的就是传值问题,比如程序里的str1,str2,是先创建的str1并直接赋值为"str1",再将str1的值付给str2,最后str1再次赋值为changed
结果加上了 Person p1 = new Person();
p1.setName("p1Name");
Person p2 = p1; 来比较P1中存的是: Person@1995d80而Integer i 存的是5 String 类似