java的参数传递与内存分配问题

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class BirthDate {
    private int day;
    private int month;
    private int year;
    
    public BirthDate(int d, int m, int y) {
        day = d;
        month = m;
        year = y;
    }
    
   //省略get set
    
    public void display() {
        System.out.println
        (day + " - " + month + " - " + year);
    }
}


public class Test{
    public static void main(String args[]){
        Test test = new Test();
        int date = 9;
        BirthDate d1= new BirthDate(7,7,1970);
        BirthDate d2= new BirthDate(1,1,2000);    
        test.change1(date);
        test.change2(d1);
        test.change3(d2);
        System.out.println("date=" + date);
        d1.display();
        d2.display();
    }
    
    public void change1(int i){
        i = 1234;
    }
    
    public void change2(BirthDate b) {
        b = new BirthDate(22,2,2004);
    }
    
    public void change3(BirthDate b) {
        b.setDay(22);
    }
}

java的参数传递与内存分配问题

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原文地址：http://blog.csdn.net/dlf123321/article/details/44066005