赋值

package projict05;

public class test14 {
    public static void main(String[] args) {
        //基本数据类型
        int m=10;
        int n=m;
        System.out.println(n);//10
        
        n=20;
        System.out.println(m);//10
        
        //引用数据类型
        Order o1=new Order();
        o1.id=1001;
        //将o1变量的地址值传递给变量o2
        Order o2=o1;
        System.out.println(o2.id);//1001
        
        
        o2.id=1002;
        System.out.println(o1.id);//1002
        
        
    }

}

class Order{
    int id;
}