将java库导入到x10类中

Question

我正在做一个x10语言的项目。它的后台是java。我需要导入一些有用的java库到x10类。但是，当我用ant构建项目时，它会给出构建错误，说没有找到导入的类名。然后我尝试将它们导入到java类中。我成功了。

但我需要的是，将它们导入到x10类

Answer 1

您需要做两件事。

1. 在x10程序中添加导入声明(例如import java.util.HashMap)
2. 确保在调用x10c编译器时，要使用的Java类的.class文件位于源路径中。如果您导入的类是Java标准库(Java .*)的一部分，那么这应该可以正常工作。如果要导入自己的类，则需要使用-cp命令行参数告诉x10c这些类。

在samples/Java .interop目录中有一些X10/Java互操作的示例，可能会有所帮助。以下是其中一个参考:

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

/**
 * An example to show how to use Apache HttpComponents HttpClient 4.2.1 in X10.
 * Compile as "x10c -cp httpclient-4.2.1.jar:httpcore-4.2.1.jar HttpClient.x10"
 * Run as as "x10 -cp .:httpclient-4.2.1.jar:httpcore-4.2.1.jar:commons-logging-1.1.1.jar HttpClient"
 */
public class HttpClient {
    static val url = "http://targethost/";
    public static def main(Rail[String]):void {
        finish for (p in Place.places()) {
            at (p) async {
                val ncores = java.lang.Runtime.getRuntime().availableProcessors();
                Console.OUT.println("Place " + p.id + " has " + ncores + " cores.");
                finish for (var i:Int = 0n; i < ncores; ++i) {
                    val coreid = i;
                    async {
                        Console.OUT.println("Place " + p.id + " core " + coreid + " start.");
                        val httpclient = new DefaultHttpClient();
                        val httpGet = new HttpGet(url);
                        while (true)
                        {
                            val response1 = httpclient.execute(httpGet);
                            /*
                             * The underlying HTTP connection is still held by the response object 
                             * to allow the response content to be streamed directly from the network socket. 
                             * In order to ensure correct deallocation of system resources 
                             * the user MUST either fully consume the response content  or abort request 
                             * execution by calling HttpGet#releaseConnection().
                             */
                            try {
                                Console.OUT.println(response1.getStatusLine());
                                val entity1 = response1.getEntity();
                                /* do something useful with the response body and ensure it is fully consumed */
                                EntityUtils.consume(entity1);
                            } finally {
                                httpGet.releaseConnection();
                            }
                        }
                    }
                }
            }
        }
    }
}

Answer 2

x10 2.6.1以这种方式在Java 8中开箱即用。