Edit
Java中对象初始化的过程和对象调用成员的过程
1.对象初始化过程
Person p = new Person(“zhangsan”,30)
上面的代码做了如下事情:
1在栈内存中建立main变量和P变量;
2.因为new用到了Person.class文件,所以首先会将Person.class加载到内存;
3.执行static静态代码块(如果有的话),会给Person类进行初始化;
4.在堆内存中开辟空间,分配内存地址;
5.在堆内存中建立对象的特有属性,并默认初始化;
6.对堆内存中的对象进行构造代码块初始化;
7.对堆内存中对象进行相应的构造函数初始化;
8.将对象的内存地址值给堆内存中的P变量;
2.对象调用成员过程
Person p = new Person(“张三”,10);
p.setName(“李四”);//Person类中有静态变量和静态方法
上面在内存中做了如下事情:
1.在栈内存中建立main,还有P变量;
2.加载Person类,并在方法区建立静态变量和方法,以及其他方法和变量;
3.在堆内存中建立newPerson,并初始化后,将地址地址给栈内存中的P变量,这个P就指向了堆内存的Person对象;
4.在栈内存中创建SetName区域,同时里面有name变量和this变量;
5.将P的值给setName的this,那么这个this,就指向了堆内存中newPerson对象
6.最后setName的代码this.name=name将堆内存中的name=”张三” 改为了 name=”李四”
示意图
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