Java 8
The main changes of the Java 8 release were these:

Lambda Expression and Stream API
Method Reference
Default Methods
Type Annotations
Repeating Annotations
Method Parameter Reflection

Java 9
Java 9 introduced these main features:

Java Module System
Try-with-resources
Diamond Syntax with Inner Anonymous Classes
Private Interface Methods

Java 10
Implicit Typing with var

Java 11
Local Variable Type in Lambda Expressions

Java 14
Switch Expressions
        days = switch (month) {
            case JANUARY, MARCH, MAY, JULY, AUGUST, OCTOBER, DECEMBER -> 31;
            case FEBRUARY -> 28;
            case APRIL, JUNE, SEPTEMBER, NOVEMBER -> 30;
            default -> throw new IllegalStateException();
        };
		


Java 15
Text Blocks

Java 16
Pattern Matching of instanceof

defining variable Car c and Bicycle b

public class PatternMatching {
    public static double price(Vehicle v) {
        if (v instanceof Car c) {
            return 10000 - c.kilomenters * 0.01 -
                    (Calendar.getInstance().get(Calendar.YEAR) -
                            c.year) * 100;
        } else if (v instanceof Bicycle b) {
            return 1000 + b.wheelSize * 10;
        } else throw new IllegalArgumentException();
    }
}

Records : we cannot extend a record class

Java 17
Sealed Classes
	The final modifier on a class doesn’t allow anyone to extend it
	What about when we want to extend a class but only allow it for some classes?
	
	public sealed class Vehicle permits Bicycle, Car {...}