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  1. import java.io.*;
  2. import java.lang.reflect.*;
  3. class Test2 {
  4.     public static void main(String[] args) throws Exception {
  5.         args = new String[0];
  6.         System.setOut(new PrintStream(new ByteArrayOutputStream()));
  7.         System.setErr(new PrintStream(new ByteArrayOutputStream()));
  8.         System.setIn(new ByteArrayInputStream(new byte[0]));
  9.  
  10.         Field modifiersField = Field.class.getDeclaredField("modifiers");
  11.         modifiersField.setAccessible(true);
  12.  
  13.         Class<?> fdClass = java.io.FileDescriptor.class;
  14.         Field outField = fdClass.getDeclaredField("out");
  15.         outField.setAccessible(true);
  16.         modifiersField.setInt(outField, outField.getModifiers() & ~Modifier.FINAL);
  17.         outField.set(null, new FileDescriptor());
  18.         Field errField = fdClass.getDeclaredField("err");
  19.         errField.setAccessible(true);
  20.         modifiersField.setInt(errField, errField.getModifiers() & ~Modifier.FINAL);
  21.         errField.set(null, new FileDescriptor());
  22.         Field inField = fdClass.getDeclaredField("in");
  23.         inField.setAccessible(true);
  24.         modifiersField.setInt(inField, inField.getModifiers() & ~Modifier.FINAL);
  25.         inField.set(null, new FileDescriptor());
  26.         // program here
  27.         Constructor<?> c = fdClass.getDeclaredConstructor(int.class);
  28.         c.setAccessible(true);
  29.         System.setOut(new PrintStream(new FileOutputStream((FileDescriptor)c.newInstance(1))));
  30. 		  System.out.println("Hello, World!");
  31.     }
  32. }
Success #stdin #stdout 0.1s 321600KB
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stdin
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Standard input is empty
stdout
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Hello, World!
https://ideone.com/dh76zl
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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