Java stack and stack, java stack

Java stack and stack, java stack

Java basic type:

Variables are stored in the stack.

 

Java reference type:

The variable name is stored in the stack area, and the variable content is stored in the heap area.

 

Instance 1:

Int a = 6;

Int B = 9;

Swap (int x, int y)

{

Int tmp = x;

X = y;

Y = x;

}

Exchange between a and B fails because Stack a and B are copied in the method. In this case, x y and a B are not in the same group.

 

Example 2:

Class Data

{

Int a = 6;

Int B = 9;

}

Data data_1 = new DataWrap ();

Data_1.a = 6;

Data_1. B = 9;

Swap (Data data_2)

{

Int tmp = data_2.a;

Data_2.a = data_2. B;

Data_2. B = tmp;

}

A and B are switched successfully, because data_2 only copies a data_1 reference in the stack memory, but data_1 and data_2 both point to the same heap memory.