Detailed explanation of the infinite loop of non-static member variables in Java

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1. Non-static member variables

When the member variable is a non-static member variable and is specific to the current class When instantiating, an infinite loop will occur

Example:

public class ConstructorCls {
 private ConstructorCls obj=new ConstructorCls();
}

public class TestC {

 public static void main(String[] args) {
  ConstructorCls c =new ConstructorCls();
 }
}

Result:

Exception in thread "main" java.lang.StackOverflowError
at com.ConstructorCls.(ConstructorCls.java:7)
at com.ConstructorCls.(ConstructorCls.java:7)
at com.ConstructorCls.(ConstructorCls.java:7)

Analysis: When new ConstrutorCls() will instantiate ConstrutorCls, Then the member obj of this class is initialized, and obj instantiates its own class. This continues until StackOverflowError

2. Static member variables

Static member variables belong to the class and there will be no infinite loop

For example:

public class ConstructorCls {
 private static ConstructorCls obj=new ConstructorCls(); 
}

public class TestC {

 public static void main(String[] args) {
  ConstructorCls c =new ConstructorCls();
 }
}

Analysis: When new ConstructorCls(), ConstructorCls is first added to the JVM, and the static content of the class is loaded when loading. Initialize the members (only once when loading), initialize the obj object, and create a new ConstructorCls. A key point here is that this static member belongs to the class and does not belong to an instance object, so an infinite loop will not occur.

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