bash 如何在不退出 JVM 的情况下多次运行 Java 程序？
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How to run a Java program multiple times without JVM exiting?
提问by HymanWM
Suppose I have a Java program Test.class, if I used the below script
假设我有一个 Java 程序Test.class，如果我使用下面的脚本
for i in 1..10
do
java Test
done
the JVM would exit each time java Testis invoked.
每次java Test调用JVM 时都会退出。
What I want is running java Testmultiple times without exiting the JVM, so that, the optimized methods in prior runs can be used by later runs, and possibly be further optimized.
我想要的是在java Test不退出JVM的情况下多次运行，以便以后运行可以使用先前运行中优化的方法，并可能进一步优化。
回答by Nicolas Mommaerts
Why not write a Java program that repeatedly calls the entry point of the program you want to run?
为什么不写一个重复调用你要运行的程序的入口点的Java程序呢？
回答by mtk
Run this once
运行一次
java Run
The main Program calling your Testclass mulitple times.
主程序Test多次调用您的课程。
class Run {
public static void main(String[] args) {
for(int i=0; i<10; i++){
Test.main(args);
}
}
}
回答by CodeBlue
public class RunTest
{
public static void main(String[] args)
{
for(int i=1; i<=10; i++)
Test.main(args);
}
}
This should do it. You can call the Test class' main function with the same arguments you pass to your main function. This is the "wrapper" that another poster referred to.
这应该做。您可以使用传递给 main 函数的相同参数调用 Test 类的 main 函数。这是另一张海报提到的“包装器”。
回答by DankMemes
Use code like this:
使用这样的代码：
public static void main2(String args[]){ // change main to main2
for(int i=0;i<10;i++)main(args);
}
public static void main(String args[]){ // REAL main
//...
}
回答by Johan Sj?berg
Perhas a ProcessBuilderwould be suitable? E.g., something like
Perhas aProcessBuilder将是合适的？例如，像
String[] cmd = {"path/to/java", "test"};
ProcessBuilder proc = new ProcessBuilder(cmd);
Process process = proc.start();
回答by Ajay George
What you want to do is put the loop inside the Testclass or pass the number of times you want to loop as an argument to the main()inside Test.
您想要做的是将循环放入Test类中或将您想要循环的次数作为参数传递给main()inside Test。
NOTE:
笔记：
If you are looking at JIToptimizations it will take more than 10 iterations to kick in.
如果您正在研究JIT优化，则需要 10 多次迭代才能开始。
回答by Diego Torres Milano
Same as previous examples but using command line args
与前面的示例相同，但使用命令行参数
public class Test {
public static void main(String[] args) {
if ( args.length > 0) {
final Integer n = Integer.valueOf(args[0]);
System.out.println("Running test " + n);
if ( n > 1 ) {
main(new String[] { Integer.toString(n-1) });
}
}
}
}
use the args to indicate the number of runs
使用 args 表示运行次数
$ java Test 10
