SunClipboard.java 文件源码

public synchronized void setContents(Transferable contents,
                                     ClipboardOwner owner) {
    // 4378007 : Toolkit.getSystemClipboard().setContents(null, null)
    // should throw NPE
    if (contents == null) {
        throw new NullPointerException("contents");
    }

    initContext();

    final ClipboardOwner oldOwner = this.owner;
    final Transferable oldContents = this.contents;

    try {
        this.owner = owner;
        this.contents = new TransferableProxy(contents, true);

        setContentsNative(contents);
    } finally {
        if (oldOwner != null && oldOwner != owner) {
            EventQueue.invokeLater(new Runnable() {
                public void run() {
                    oldOwner.lostOwnership(SunClipboard.this, oldContents);
                }
            });
        }
    }
}