使用ProcessBuilder运行外部Java进程，并给出堆大小

import java.io.IOException;

public class ProcessBuilderExample {
    public static void main(String[] args) {
        // 定义要运行的 Java 类
        String className = "com.example.MyClass";
        
        // 设置 JVM 参数，包括堆大小
        String javaHome = System.getProperty("java.home");
        String javaBin = javaHome + "/bin/java";
        String classpath = System.getProperty("java.class.path");
        String jvmArgs = "-Xms512m -Xmx1024m"; // 设置初始堆大小为 512MB，最大堆大小为 1024MB
        
        // 构建命令行
        ProcessBuilder builder = new ProcessBuilder(javaBin, jvmArgs, "-cp", classpath, className);
        
        try {
            // 启动进程
            Process process = builder.start();
            
            // 等待进程结束并获取退出码
            int exitCode = process.waitFor();
            System.out.println("Process exited with code " + exitCode);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
            e.printStackTrace();
        }
    }
}