How to operate the number stack in java

Description

1. Operation stack, during the execution of the method, write data to the stack or extract data according to the byte code.

2. It is mainly used to save the intermediate results of the calculation process and also serves as a temporary storage space for variables during the calculation process.

3. The operation stack is the working area of ​​the jvm execution engine. When a method just starts executing, a new stack frame will also be created, and the operation stack of the method is empty.

Examples

public class Test {
  public int test(int a, int b) {
    int c = a + b;
    return c;
  }
}

What collection classes are there in Java

Collections in Java are mainly divided into four categories:

1, List List: ordered, repeatable;

2, Queue queue: ordered, repeatable;

3, Set collection: non-repeatable;

4, Map mapping: unordered, unique keys, non-unique values.

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