每个线程都有其自己的栈，管理其局部数据，各栈之间彼此不可见
所有局部的基本数据类型都在栈上创建（All local variables of primitive types (boolean, byte, short,char, int, …) are fully stored on the thread stack and are thusnot visible to other threads）
多线程之间传递数据是通过复制而非引用
所有new创建的对象的内存都在堆上面分配（The heap contains all objects created in Java application,regardless of what thread created the object）
It does not matter if an object was created and assigned to a local variable,or created as a member variable of another object, the object is still storedon the heap. 即使是局部变量的object，也是在堆上创创建
来源：cswenboli
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