[投稿123]Dynamic Java

[kentyeh (kent)]

### 作業系統需求 ###

Windows，理論上 Linux 應該也可以。

### 執行步驟 ###

1.安裝好JDK 1.6 +
2.撰寫Submit123.java存放到硬碟，例如 x:\ (widnows) 或 ~/ (linux)下，
  Submit123.java內容如下

import java.io.File;
import java.io.FileWriter;
import java.lang.reflect.Method;
import java.util.Arrays;
import javax.tools.JavaCompiler;
import javax.tools.StandardJavaFileManager;
import javax.tools.StandardLocation;
import javax.tools.ToolProvider;

public class Submit123 {

    public static void main(String[] args) throws Exception {
        File sourceFile = new File("./Output123.java");
        FileWriter writer = new FileWriter(sourceFile);
        writer.write("public class Output123{ \n"
                + " public static void main(String[] args) {\n"
                + "    char[] ch = new char[]{'1','2','3'};\n"
                + "
 System.out.println(Integer.parseInt(String.valueOf(ch)));\n"
                + " }\n"
                + "}");
        writer.close();
        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
        StandardJavaFileManager fileManager =
compiler.getStandardFileManager(null, null, null);
        fileManager.setLocation(StandardLocation.CLASS_OUTPUT,
Arrays.asList(new File("./")));
        compiler.getTask(null, fileManager, null, null, null,

fileManager.getJavaFileObjectsFromFiles(Arrays.asList(sourceFile))).call();
        fileManager.close();
        //sourceFile.deleteOnExit();
        Class params[] = {};
        Object paramsObj[] = {};
        Class class123 = Class.forName("Output123");
        Method main = class123.getDeclaredMethod("main", args.getClass());
        Object[] passedArgs = { args };
        main.invoke(null, passedArgs);
    }
}

3.開啟Dos視窗或Terminator，cd到 x: 或 ~ 並執行命令
  javac Submit123.java
4.執行命令,產出 Output123.class 並執行
  java Submit123

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