Write a string to the system clipboard : Clipboard « Development « Java Tutorial

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2. Development
3. Clipboard

import java.awt.Toolkit;
import java.awt.datatransfer.StringSelection;

public class Main {
  public static void main(String[] argv) throws Exception {
    StringSelection ss = new StringSelection("str");
    Toolkit.getDefaultToolkit().getSystemClipboard().setContents(ss, null);
  }
}