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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Entity entity1 = new Entity();
		entity1.carId = 1;
		entity1.tableKind = 2;
 
		Entity entity2 = new Entity();
		entity2.carId = 2;
		entity2.tableKind = 3;
 
		List<Entity> list = new ArrayList<>();
		list.add(entity1);
		list.add(entity2);
 
		int index = list.indexOf(1);
		Systemout.println(index);
 
	}
 
	public class Entity {
		long carId;
		int tableKind;
	}
}

Main.java:12: error: non-static variable this cannot be referenced from a static context
		Entity entity1 = new Entity();
		                 ^
Main.java:16: error: non-static variable this cannot be referenced from a static context
		Entity entity2 = new Entity();
		                 ^
Main.java:25: error: cannot find symbol
		Systemout.println(index);
		^
  symbol:   variable Systemout
  location: class Ideone
3 errors

Standard output is empty