The difference between Java Heap and Stack is that heapstack

The difference between Java Heap and Stack is that heapstack

Heap in Java is a runtime data zone used to store class objects; Stack) it mainly stores basic data types (int, char, double, and other 8 basic data types) and object handles.

Example 1

Int a = 5; int B = 5; System. out. println (a = B );

In the above example, the compiler first processes int a = 5, first creates a reference a in the stack, and then searches for the value of 5 in the stack. If yes, point a to 5. If no, create a 5 and then point a to 5. When processing int B = 5, because the stack must already have 5, direct B to 5, so that both a and B point to 5, so a = B is true.

Example 2

Int a = 5; int B = 5; System. out. println (a = B); B = 6; System. out. println (a = B );

In the preceding example, after a value is assigned to B, a and B do not point to the same value. Therefore, the first a = B is true, and the second a = B is false.

Example 3

String a = "ABC"; String B = "ABC"; String c = new String ("ABC"); String d = new String ("ABC"); System. out. println (a = B); System. out. println (a = c); System. out. println (c = d );

In the above example, String is an object. Therefore, it is stored in the heap. The process of assigning values to a and B is similar to that of Example 1, but it is only carried out in the heap. C and d use the new Keyword. Therefore, no matter whether the value exists in the heap or not, a new value is created in the heap. Therefore, the output result is true, false, or false.