java堆溢出和栈溢出

import java.util.ArrayList;
import java.util.List;
 
public class Demo_071202 {
    public static void main(String[] args) {
        List<Test> list=new ArrayList<>();
        while (true){
            list.add(new Test());
        }
 
    }
    static  class Test{}
}

-Xms20M -Xmx20M -XX:+HeapDumpOnOutOfMemoryError

java.lang.OutOfMemoryError: Java heap space
Dumping heap to java_pid21336.hprof ...
Heap dump file created [22149788 bytes in 0.062 secs]
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
  at java.base/java.util.Arrays.copyOf(Arrays.java:3720)
  at java.base/java.util.Arrays.copyOf(Arrays.java:3689)
  at java.base/java.util.ArrayList.grow(ArrayList.java:238)
  at java.base/java.util.ArrayList.grow(ArrayList.java:243)
  at java.base/java.util.ArrayList.add(ArrayList.java:486)
  at java.base/java.util.ArrayList.add(ArrayList.java:499)
  at com.demo.controller.Demo_071202.main(Demo_071202.java:10)

public class Demo_071203 {
    public static void main(String[] args) {
        test();
    }
    public static void test(){
        test();
    }
}