Here you can find the source of setText(JTextComponent textComp, String text)
| Parameter | Description |
|---|---|
| textComp | text component whose text needs to be set |
| text | text to be set. null will be treated as empty string |
public static void setText(JTextComponent textComp, String text)
//package com.java2s; /**/*from w w w . ja v a2s . c o m*/ * JLibs: Common Utilities for Java * Copyright (C) 2009 Santhosh Kumar T <santhosh.tekuri@gmail.com> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. */ import javax.swing.text.DefaultCaret; import javax.swing.text.JTextComponent; public class Main { /** * sets text of textComp without moving its caret. * * @param textComp text component whose text needs to be set * @param text text to be set. null will be treated as empty string */ public static void setText(JTextComponent textComp, String text) { if (text == null) text = ""; if (textComp.getCaret() instanceof DefaultCaret) { DefaultCaret caret = (DefaultCaret) textComp.getCaret(); int updatePolicy = caret.getUpdatePolicy(); caret.setUpdatePolicy(DefaultCaret.NEVER_UPDATE); try { textComp.setText(text); } finally { caret.setUpdatePolicy(updatePolicy); } } else { int mark = textComp.getCaret().getMark(); int dot = textComp.getCaretPosition(); try { textComp.setText(text); } finally { int len = textComp.getDocument().getLength(); if (mark > len) mark = len; if (dot > len) dot = len; textComp.setCaretPosition(mark); if (dot != mark) textComp.moveCaretPosition(dot); } } } }