import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;


public class TestJavaCommand {
    /**
     * 執行命令
     */
    public static void executeCommand() {
        Runtime runtime = Runtime.getRuntime();
        try {
            String[] command 
 
= {"java", "-version"};
            Process process = runtime.exec(command);
            // 標準輸入流（必須寫在 waitFor 之前）
            String inStr = consumeInputStream(process.getInputStream());
            // 標準錯誤流（必須寫在 waitFor 之前）
            String errStr = consumeInputStream(process.getErrorStream()); //若有錯誤資訊則輸出
 

            int proc = process.waitFor();
            if (proc == 0) {
            } else {
                System.out.println("執行失敗");
            }
        } catch (IOException | InterruptedException e) {
            e.printStackTrace();
        }
    }

    /**
     * @param is
     * @return
     * 
 
@throws IOException
     */
    private static String consumeInputStream(InputStream is) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(is, "GBK"));
        String s;
        StringBuilder sb = new StringBuilder();
        while ((s = br.readLine()) != null) {
            System.out.println(s);
            sb.append(s);
        }
        return sb.toString();
    }
}