What are the differences between different variables in java

Difference

1. Location in the class

Member variables: in the class, outside the method

2. Location in the memory

Member variables: Heap

Local variables: Stack

3. Initialized value

Member variables: have default values

Local variables: no default value, only definition and assignment can be used

Life cycle

Member variables: created with the creation of the object, disappear with the disappearance of the object

Local variables: exist with the call of the method and disappear with the end of the method

Instance

The problem of duplicate names of member variables and local variables , proximity principle;

can be distinguished using the this keyword. this.string refers to the member variables in the class, not within the method.

public class Demo{
    String string= "成员变量";
 
    public static void main(String[] args) {
        new Demo().show();
    }
 
    public void show() {
        String string= "局部变量";
        System.out.println(string);
    }
}

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