---
title: Java 17 
category: Java
tag:
  - Java
---

Java 17  2021  9  14 LTS

 Oracle  Oracle JDK Java

 17  2029  9 

![](https://img-blog.csdnimg.cn/4c1611fad59449edbbd6e233690e9fa7.png)

Java 17  Java 8 LTS Java Spring 6.x  Spring Boot 3.x  Java 17

 14 

- [JEP 306:Restore Always-Strict Floating-Point Semantics](https://openjdk.java.net/jeps/306)
- [JEP 356:Enhanced Pseudo-Random Number Generators](https://openjdk.java.net/jeps/356)
- [JEP 382:New macOS Rendering Pipeline macOS ](https://openjdk.java.net/jeps/382)
- [JEP 391:macOS/AArch64 Port macOS AArch64](https://openjdk.java.net/jeps/391)
- [JEP 398:Deprecate the Applet API for Removal Applet API](https://openjdk.java.net/jeps/398)
- [JEP 403:Strongly Encapsulate JDK Internals JDK ](https://openjdk.java.net/jeps/403)
- [JEP 406:Pattern Matching for switch (switch )](https://openjdk.java.net/jeps/406)
- [JEP 407:Remove RMI Activation](https://openjdk.java.net/jeps/407)
- [JEP 409:Sealed Classes](https://openjdk.java.net/jeps/409)
- [JEP 410:Remove the Experimental AOT and JIT Compiler AOT  JIT ](https://openjdk.java.net/jeps/410)
- [JEP 411:Deprecate the Security Manager for Removal](https://openjdk.java.net/jeps/411)
- [JEP 412:Foreign Function & Memory API ( API)](https://openjdk.java.net/jeps/412)
- [JEP 414:Vector API ](https://openjdk.java.net/jeps/417)
- [JEP 415:Context-Specific Deserialization Filters](https://openjdk.java.net/jeps/415)

 356398413406407409410411412414 

[OpenJDK Java 17 ](https://openjdk.java.net/projects/jdk/17/) 

## JEP 356:

JDK 17  `Random``ThreadLocalRandom``SplittableRandom` 3 

Java 17  pseudorandom number generatorRPNG PRNG 

> [RPNG](https://ctf-wiki.org/crypto/streamcipher/prng/intro/) PRNG PRNG 



```java
RandomGeneratorFactory l128X256MixRandom = RandomGeneratorFactory.of("L128X256MixRandom");
// 
RandomGenerator randomGenerator = l128X256MixRandom.create(System.currentTimeMillis());
// 
randomGenerator.nextInt(10));
```

## JEP 398: Applet API 

Applet API  Web  Java 

Applet API  Java 9 [JEP 289](https://openjdk.java.net/jeps/289)

## JEP 406:switch 

 `instanceof`  `switch` 

`instanceof` 

```java
// Old code
if (o instanceof String) {
    String s = (String)o;
    ... use s ...
}

// New code
if (o instanceof String s) {
    ... use s ...
}
```

`switch` 

```java
// Old code
static String formatter(Object o) {
    String formatted = "unknown";
    if (o instanceof Integer i) {
        formatted = String.format("int %d", i);
    } else if (o instanceof Long l) {
        formatted = String.format("long %d", l);
    } else if (o instanceof Double d) {
        formatted = String.format("double %f", d);
    } else if (o instanceof String s) {
        formatted = String.format("String %s", s);
    }
    return formatted;
}

// New code
static String formatterPatternSwitch(Object o) {
    return switch (o) {
        case Integer i -> String.format("int %d", i);
        case Long l    -> String.format("long %d", l);
        case Double d  -> String.format("double %f", d);
        case String s  -> String.format("String %s", s);
        default        -> o.toString();
    };
}

```

 `null` 

```java
// Old code
static void testFooBar(String s) {
    if (s == null) {
        System.out.println("oops!");
        return;
    }
    switch (s) {
        case "Foo", "Bar" -> System.out.println("Great");
        default           -> System.out.println("Ok");
    }
}

// New code
static void testFooBar(String s) {
    switch (s) {
        case null         -> System.out.println("Oops");
        case "Foo", "Bar" -> System.out.println("Great");
        default           -> System.out.println("Ok");
    }
}
```

## JEP 407:

 (RMI)  RMI RMI 

## JEP 409

 [JEP 360](https://openjdk.java.net/jeps/360)  Java 15  JDK 16   [JEP 397](https://openjdk.java.net/jeps/397) 

 [Java 15 ](./java15.md) 

## JEP 410: AOT  JIT 

 Java 9  [JEP 295](https://openjdk.java.net/jeps/295) , (AOT)  Java 

Java 17 (AOT)  (JIT)  Java  JVM  (JVMCI) JIT 

## JEP 411:



 Java 1.0 Java  Java Java 17  Applet API ( [JEP 398](https://openjdk.java.net/jeps/398) ) 

## JEP 412: API

Java  API  Java  JVM  JVM  API  Java  JNI 

 API  Java 17  [JEP 412](https://openjdk.java.net/jeps/412) [ JEP 419](https://openjdk.org/jeps/419)  Java 18  [JEP 424](https://openjdk.org/jeps/424)  Java 19 

 [Java 19 ](./java19.md)  API

## JEP 414: API

Vector API  [JEP 338](https://openjdk.java.net/jeps/338) [ API](http://openjdk.java.net/jeps/11) Java 16  [JEP 414](https://openjdk.java.net/jeps/414)  Java 17  [JEP 417](https://openjdk.java.net/jeps/417)  Java 18  [JEP 426](https://openjdk.java.net/jeps/426)  Java 19 

 API  API  CPU SIMD CPU  HotSpot  API  Java 

 [Java 18 ](./java18.md)  API