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Clipboard Usage
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.ClipboardOwner;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;

public class ClipboardUsage implements ClipboardOwner {

    public void setClipboardContents(String aString) {
        StringSelection stringSelection = new StringSelection(aString);
        Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
        clipboard.setContents(stringSelection, this);
    }

    public String getClipboardContents() {
        String result = "";
        Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
        // odd: the Object param of getContents is not currently used
        Transferable contents = clipboard.getContents(null);
        boolean hasTransferableText = (contents != null) && contents.isDataFlavorSupported(DataFlavor.stringFlavor);
        if (hasTransferableText) {
            try {
                result = (String) contents.getTransferData(DataFlavor.stringFlavor);
            } catch (UnsupportedFlavorException ex) {
                // highly unlikely since we are using a standard DataFlavor
                System.out.println(ex);
                ex.printStackTrace();
            } catch (IOException ex) {
                System.out.println(ex);
                ex.printStackTrace();
            }
        }
        return result;
    }

    @Override
    public void lostOwnership(Clipboard clipboard, Transferable contents) {

    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        ClipboardUsage cu = new ClipboardUsage();
        System.out.printf("Clipboard : %s%n", cu.getClipboardContents());
        cu.setClipboardContents("clipboard test.");
        System.out.printf("Clipboard : %s%n", cu.getClipboardContents());
    }

}