没有System.out怎么办，在控制台上打印？ [英] What to do without System.out, to print on console?

问题描述

我一直遇到最近在接受采访时被问到的问题。问题表示为 - >假设您无法访问Jdk API中的System类，也无法使用ECHO，您在JRE 5环境中，如何在控制台上打印任何内容？问题真正开始于 - 为什么Java给了我们PrintStream对象System.out ??为什么它是最终的？没有任何其他方法可以在控制台上打印任何东西。??

I have been stuck with a problem that was asked recently at an interview. The problem is stated as--> Suppose you don't have access to System class in Jdk API, Also you cannot use ECHO, you are in JRE 5 environment, how will you print anything on console?? The question really started with -- Why has Java given us the PrintStream object System.out ??And why is it final?? Isn't there any other way to print anything on console.??

推荐答案

如果你想要绕过System对象。 System.out做了很多额外的事情（例如处理unicode），所以如果你真的只想要原始输出和性能，你实际上甚至可能绕过它。

You could bypass the System object if you want to. System.out does a lot of extra stuff (handling unicode, for instance), so if you really want just the raw output and performance, you actually probably even should bypass it.

import java.io.*;

public class PrintOutTest {
  public static void main(String args[]) throws IOException {
    BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new
      FileOutputStream(FileDescriptor.out), "ASCII"), 512);
    out.write("test string");
    out.write('\n');
    out.flush();
  }
}

这已在这里。

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