- JDK8
At least May 2026 for Eclipse Adoptium - JDK17
At least Oct 2027 for Eclipse Adoptium - JDK21
Java
Project Loom
lambda
我们使用实现Runnable的不同来做对比。
java 7
package my.csdn2;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class RunnableThread implements Runnable {
public int mul(int x, int y) {
int result = 0;
result = x * y;
return result;
}
public void run() {
// TODO Auto-generated method stub
for (int i = 0; i < 5; i++) {
for (int j = 0; j < 5; j++) {
System.out.print("x: " + i + " y: " + j + " result: ");
System.out.println(mul(i, j));
}
}
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
// way 1
// Thread rt = new Thread(new RunnableThread());
// rt.start();
// way 2
ExecutorService exec = Executors.newCachedThreadPool();
exec.execute(new RunnableThread());
}
}
java8
package my.csdn2;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class RunnableLambdaExample {
public int mul(int x, int y) {
int result = 0;
result = x * y;
return result;
}
public static void main(String[] args) {
// TODO Auto-generated method stub
RunnableLambdaExample rle = new RunnableLambdaExample();
Runnable task1 = () -> {
for (int i = 0; i < 5; i++) {
for (int j = 0; j < 5; j++) {
System.out.print("x: " + i + " y: " + j + " result: ");
System.out.println(rle.mul(i, j));
}
}
};
// way 1
//Thread rt = new Thread(task1);
//rt.start();
// way 2
ExecutorService exec = Executors.newCachedThreadPool();
exec.execute(task1);
}
}
Scala
在Scala把类和对象明确的分开了。
Class相当于模板；Object是Class的实现。
要测试代码必须使用main
def main(args: Array[String]) {
...
}
Class
package com.example
class MyClass {
def add(a:Int, b:Int):Int = {
var result = 0
result = a + b
result
}
}
Object
import com.example.MyClass
object MyExec {
val str = "Hello world!"
val a1 = 3
val b1 = 2
def main(args: Array[String]) {
val myExample = new MyClass
val ret = myExample.add(a1, b1)
if (ret > 4) {
println(str)
}
else {
println(ret)
}
}
}